þÿ<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html > <head><title>Masami Sekizawa / •¢l¢ kcŽ¬</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="generator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)"> <meta name="originator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)"> <!-- html --> <meta name="src" content="ms.tex"> <meta name="date" content="2010-04-02 09:58:00"> <link rel="stylesheet" type="text/css" href="ms.css"> </head><body > <div class="maketitle"> <h2 class="titleHead">Masami&#x00A0;Sekizawa / •¢l¢ kcŽ¬</h2> <div class="author" ><span class="ptmr7t-x-x-109">e-mail: </span><a href="mailto:&#115;&#101;&#107;i&#122;&#97;&#119;a&#64;&#117;&#45;&#103;&#97;&#107;u&#103;e&#105;.a&#99;&#46;&#106;&#112;"><span class="ptmr7t-x-x-109">here</span></a></div><br /> <div class="date" ></div> </div> <span <!--l. 68--><p class="indent" > <span class="ptmb7t-x-x-144">Accepted papers</span> <h3 class="likesectionHead"><a id="x1-1000"></a></h3> <!--l. 69--><p class="noindent" > <div class="thebibliography"> <p class="bibitem" ><span class="biblabel"> [1]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe-P11"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Invariance of the naturally lifted metrics on linear frame bundles over affine manifolds,&#x00A0;to appear in <span class="ptmri7t-x-x-120">Publ. Math.</span> <span class="ptmri7t-x-x-120">Debrecen. </span><br class="newline" /><a href="./Invariance.pdf" >pdf 122 kB</a>.</p></div> <!--l. 78--><p class="indent" > <span class="ptmb7t-x-x-144">Published papers</span> <h3 class="likesectionHead"><a id="x1-2000"></a></h3> <!--l. 79--><p class="noindent" > <div class="thebibliography"> <p class="bibitem" ><span class="biblabel"> [1]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe12"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Curvatures of the diagonal lift from an affine manifold to the linear frame bundle,&#x00A0;<span class="ptmri7t-x-x-120">Cent.</span><span class="ptmri7t-x-x-120">&#x00A0;Eur.</span><span class="ptmri7t-x-x-120">&#x00A0;J.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.</span><span class="ptmri7t-x-x-120">&#x00A0;</span><span class="ptmb7t-x-x-120">10</span>(3)(2012),&#x00A0;837&#8211;843. <span class="ptmb7t-x-x-120">DOI </span>10.2478/s11533-012-0033-7 </p> <p class="bibitem" ><span class="biblabel"> [2]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSaSe12"></a>Takamichi Satoh and Masami Sekizawa:&#x00A0;Curvatures of tangent hyperquadric bundles,&#x00A0;<span class="ptmri7t-x-x-120">Differential Geometry and its Applications </span>Volume <span class="ptmb7t-x-x-120">29</span>(2011), Suppl.&#x00A0;1,&#x00A0;S255&#8211;S260. <span class="ptmb7t-x-x-120">DOI </span>10.1016/j.difgeo.2011.04.050 </p> <p class="bibitem" ><span class="biblabel"> [3]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe11"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;On natural Riemann extensions,&#x00A0;<span class="ptmri7t-x-x-120">Publ.</span> <span class="ptmri7t-x-x-120">Math. Debrecen </span><span class="ptmb7t-x-x-120">78</span>(2011),&#x00A0;no.&#x00A0;3-4,&#x00A0;709&#8211;721. <span class="ptmb7t-x-x-120">DOI </span>10.5486/PMD.2011.4992 </p> <p class="bibitem" ><span class="biblabel"> [4]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe09a"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Natural lifts in Riemannian geometry,&#x00A0;<span class="ptmri7t-x-x-120">&#8220;Variations, Geometry and Physics&#8221; in honour of Demeter Krupka&#8217;s</span> <span class="ptmri7t-x-x-120">sixty-fifth birthday,</span>&#x00A0;O.&#x00A0;Krupková and D.&#x00A0;J.&#x00A0;Saunders (Editors),&#x00A0;Nova Science Publishers,&#x00A0;New York (2009),&#x00A0;pp.&#x00A0;189&#8211;209. </p> <p class="bibitem" ><span class="biblabel"> [5]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe09"></a>Masami Sekizawa:&#x00A0;On Riemannian geometry of orthonormal frame bundles,&#x00A0;<span class="ptmri7t-x-x-120">Note Mat.</span>&#x00A0;<span class="ptmb7t-x-x-120">28</span> (2008),&#x00A0;[2009 on cover],&#x00A0;suppl.&#x00A0;1,&#x00A0;383&#8211;394 (2009).&#x00A0;ISBN:&#x00A0;978-88-548-2664-9. <br class="newline" /><a href="http://siba-ese.unisalento.it/index.php/notemat/issue/view/218" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [6]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe08d"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;On Riemannian geometry of tangent sphere bundles with arbitrary constant radius,&#x00A0;<span class="ptmri7t-x-x-120">Arch.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.</span><span class="ptmri7t-x-x-120">&#x00A0;</span>(<span class="ptmri7t-x-x-120">Brno</span>),&#x00A0;<span class="ptmb7t-x-x-120">44</span>(2008),&#x00A0;no.&#x00A0;5,&#x00A0;391&#8211;401. <br class="newline" /><a href="http://dml.cz/handle/10338.dmlcz/127131" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [7]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe08c"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;On the geometry of orthonormal frame bundles II,&#x00A0;<span class="ptmri7t-x-x-120">Ann.</span><span class="ptmri7t-x-x-120">&#x00A0;Global Anal.</span><span class="ptmri7t-x-x-120">&#x00A0;Geom.</span>&#x00A0;<span class="ptmb7t-x-x-120">33</span>(2008),&#x00A0;no.&#x00A0;4,&#x00A0;357&#8211;371. </p> <p class="bibitem" ><span class="biblabel"> [8]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe08b"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;On the geometry of orthonormal frame bundles,&#x00A0;<span class="ptmri7t-x-x-120">Math.</span><span class="ptmri7t-x-x-120">&#x00A0;Nachr.</span>&#x00A0;<span class="ptmb7t-x-x-120">281</span>(2008),&#x00A0;no.&#x00A0;12,&#x00A0;1799&#8211;1809. <span class="ptmb7t-x-x-120">DOI</span> 10.1002/mana.200610715 </p> <p class="bibitem" ><span class="biblabel"> [9]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe08a"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Invariance of <span class="zptmcm7m-x-x-120">g</span>-natural metrics on linear frame bundles, <span class="ptmri7t-x-x-120">Arch.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.</span><span class="ptmri7t-x-x-120">&#x00A0;</span>(<span class="ptmri7t-x-x-120">Brno</span>),&#x00A0;<span class="ptmb7t-x-x-120">44</span>(2008),&#x00A0;no.&#x00A0;2,&#x00A0;139&#8211;147. <br class="newline" /><a href="http://dml.cz/handle/10338.dmlcz/116924" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [10]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe08"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Invariance of <span class="zptmcm7m-x-x-120">g</span>-natural metrics on tangent bundles,&#x00A0;<span class="ptmri7t-x-x-120">Differential Geometry</span> <span class="ptmri7t-x-x-120">and its Applications,</span><span class="ptmri7t-x-x-120">&#x00A0;Proc.</span><span class="ptmri7t-x-x-120">&#x00A0;Conf.,</span><span class="ptmri7t-x-x-120">&#x00A0;in Honour of Leonhard Euler,</span><span class="ptmri7t-x-x-120">&#x00A0;Olomouc,</span><span class="ptmri7t-x-x-120">&#x00A0;August</span> <span class="ptmri7t-x-x-120">2007,</span>&#x00A0;World Sci.&#x00A0;Publ.,&#x00A0;Hackensack,&#x00A0;NJ,&#x00A0;2008,&#x00A0;pp.&#x00A0;171&#8211;181. </p> <p class="bibitem" ><span class="biblabel"> [11]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe06"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Hypersurfaces of type number 2 in the hyperbolic four-space and their extensions to Riemannian geometry,&#x00A0;<span class="ptmri7t-x-x-120">Non-Euclidean</span> <span class="ptmri7t-x-x-120">geometries,</span>&#x00A0;407&#8211;426,&#x00A0;Math.&#x00A0;Appl.&#x00A0;(N.&#x00A0;Y.),&#x00A0;581,&#x00A0;Springer,&#x00A0;New York,&#x00A0;2006. </p> <p class="bibitem" ><span class="biblabel"> [12]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe05"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;On curvatures of linear frame bundles with naturally lifted metrics,&#x00A0;<span class="ptmri7t-x-x-120">Rend.</span><span class="ptmri7t-x-x-120">&#x00A0;Semin.</span><span class="ptmri7t-x-x-120">&#x00A0;Mat.</span><span class="ptmri7t-x-x-120">&#x00A0;Univ.</span><span class="ptmri7t-x-x-120">&#x00A0;Politec.</span><span class="ptmri7t-x-x-120">&#x00A0;Torino</span> <span class="ptmb7t-x-x-120">63</span>(2005),&#x00A0;no.&#x00A0;3,&#x00A0;283&#8211;295. <br class="newline" /><a href="http://seminariomatematico.dm.unito.it/rendiconti/63-3.html" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [13]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XHaKoSe04"></a>Vladimíra Hájková,&#x00A0;Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;On three-dimensional hypersurfaces with type number two in <span class="zptmcm7m-x-x-120">H</span><sup><span class="zptmcm7t-x-x-90">4</span></sup> and <span class="zptmcm7m-x-x-120">S</span><sup><span class="zptmcm7t-x-x-90">4</span></sup> treated in intrinsic way,&#x00A0;<span class="ptmri7t-x-x-120">Rend.</span><span class="ptmri7t-x-x-120">&#x00A0;Circ.</span><span class="ptmri7t-x-x-120">&#x00A0;Mat.</span><span class="ptmri7t-x-x-120">&#x00A0;Palermo</span>(2) Suppl.&#x00A0;no.&#x00A0;<span class="ptmb7t-x-x-120">72</span>(2004),&#x00A0;107&#8211;126. <br class="newline" /><a href="http://dml.cz/handle/10338.dmlcz/701720" >Proceedings</a> </p> <p class="bibitem" ><span class="biblabel"> [14]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe02"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;On Riemannian manifolds whose tangent sphere bundles can have nonnegative sectional curvature,&#x00A0;<span class="ptmri7t-x-x-120">Univ.</span><span class="ptmri7t-x-x-120">&#x00A0;Iagel.</span><span class="ptmri7t-x-x-120">&#x00A0;Acta</span> <span class="ptmri7t-x-x-120">Math.</span>&#x00A0;no.&#x00A0;<span class="ptmb7t-x-x-120">40</span>(2002),&#x00A0;245&#8211;256. <br class="newline" /><a href="http://www.emis.de/journals/UIAM/toc-40.html" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [15]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSeVl01"></a>Old&#x0159;ich Kowalski,&#x00A0;Masami Sekizawa and Zden&#x011B;k Vla&#353;ek:&#x00A0;Can tangent sphere bundles over Riemannian manifolds have strictly positive sectional curvature?&#x00A0;Global differential geometry:&#x00A0;the mathematical legacy of Alfred Gray (Bilbao, 2000),&#x00A0;110&#8211;118,&#x00A0;<span class="ptmri7t-x-x-120">Contemp.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.,</span>&#x00A0;288,&#x00A0;Amer.&#x00A0;Math.&#x00A0;Soc.,&#x00A0;Providence,&#x00A0;RI,&#x00A0;2001. </p> <p class="bibitem" ><span class="biblabel"> [16]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe00b"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;On the scalar curvature of tangent sphere bundles with arbitrary constant radius,&#x00A0;<span class="ptmri7t-x-x-120">Proceedings of the </span>4<span class="ptmri7t-x-x-120">th Panhellenic</span> <span class="ptmri7t-x-x-120">Conference on Geometry </span>(<span class="ptmri7t-x-x-120">Patras,</span><span class="ptmri7t-x-x-120">&#x00A0;</span>1999)<span class="ptmri7t-x-x-120">.</span><span class="ptmri7t-x-x-120">&#x00A0;Bull.</span><span class="ptmri7t-x-x-120">&#x00A0;Greek Math.</span><span class="ptmri7t-x-x-120">&#x00A0;Soc.</span>&#x00A0;<span class="ptmb7t-x-x-120">44</span>(2000),&#x00A0;17&#8211;30. </p> <p class="bibitem" ><span class="biblabel"> [17]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe00a"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Geometry of tangent sphere bundles with arbitrary constant radius,&#x00A0;<span class="ptmri7t-x-x-120">Proceedings of the Symposium</span> <span class="ptmri7t-x-x-120">Contemporary Mathematics,</span>&#x00A0;N.&#x00A0;Bokan (Ed.),&#x00A0;Faculty of Mathematics,&#x00A0;University of Belgrade,&#x00A0;Belgrade,&#x00A0;2000,&#x00A0;pp.&#x00A0;219&#8211;228. </p> <p class="bibitem" ><span class="biblabel"> [18]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XHaSe00"></a>Norio Hashimoto and Masami Sekizawa:&#x00A0;Three-dimensional conformally flat pseudo-symmetric spaces of constant type,&#x00A0;<span class="ptmri7t-x-x-120">Arch.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.</span><span class="ptmri7t-x-x-120">&#x00A0;</span>(<span class="ptmri7t-x-x-120">Brno</span>) <span class="ptmb7t-x-x-120">36</span>(2000),&#x00A0;no.&#x00A0;4,&#x00A0;279&#8211;286. <br class="newline" /><a href="http://dml.cz/handle/10338.dmlcz/107737" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [19]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe00"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;On tangent sphere bundles with small or large constant radius,&#x00A0;Special issue in memory of Alfred Gray (1939&#8211;1998),&#x00A0;<span class="ptmri7t-x-x-120">Ann.</span><span class="ptmri7t-x-x-120">&#x00A0;Global Anal.</span><span class="ptmri7t-x-x-120">&#x00A0;Geom.</span>&#x00A0;<span class="ptmb7t-x-x-120">18</span>(2000),&#x00A0;no.&#x00A0;3-4,&#x00A0;207&#8211;219. </p> <p class="bibitem" ><span class="biblabel"> [20]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe98b"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Pseudo-symmetric Spaces of Constant Type in Dimension Three,&#x00A0;Personal Note,&#x00A0;Prague-Tokyo,&#x00A0;1998. <br class="newline" /><a href="./pspn.pdf" >pdf 163 kB</a> </p> <p class="bibitem" ><span class="biblabel"> [21]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe98"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Pseudo-symmetric spaces of constant type in dimension three&#8212;non-elliptic spaces,&#x00A0;<span class="ptmri7t-x-x-120">Bull.</span><span class="ptmri7t-x-x-120">&#x00A0;Tokyo Gakugei Univ.</span>&#x00A0;(4) <span class="ptmb7t-x-x-120">50</span>(1998),&#x00A0;1&#8211;28. <br class="newline" /><a href="https://ir.u-gakugei.ac.jp/handle/2309/35954/?lang=en" >Article</a> </p> <p class="bibitem" ><span class="biblabel"> [22]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe97a"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Pseudo-symmetric spaces of constant type in dimension three&#8212;elliptic spaces,&#x00A0;<span class="ptmri7t-x-x-120">Rend.</span><span class="ptmri7t-x-x-120">&#x00A0;Mat.</span><span class="ptmri7t-x-x-120">&#x00A0;Appl.</span>&#x00A0;(7) <span class="ptmb7t-x-x-120">17</span>(1997),&#x00A0;no.&#x00A0;3,&#x00A0;477&#8211;512. </p> <p class="bibitem" ><span class="biblabel"> [23]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe97"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Riemannian 3-manifolds with <span class="zptmcm7m-x-x-120">c</span>-conullity two,&#x00A0;<span class="ptmri7t-x-x-120">Boll.</span><span class="ptmri7t-x-x-120">&#x00A0;Un.</span><span class="ptmri7t-x-x-120">&#x00A0;Mat.</span><span class="ptmri7t-x-x-120">&#x00A0;Ital.</span>&#x00A0;B (7) <span class="ptmb7t-x-x-120">11</span>(1997),&#x00A0;no.&#x00A0;2,&#x00A0;suppl.,&#x00A0;161&#8211;184. </p> <p class="bibitem" ><span class="biblabel"> [24]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe96a"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Three-dimensional Riemannian manifolds of <span class="zptmcm7m-x-x-120">c</span>-conullity two,&#x00A0;Chapter 11 of the book &#8220;Riemannian manifolds of conullity two&#8221; by E.&#x00A0;Boeckx, O.&#x00A0;Kowalski and L.&#x00A0;Vanhecke; published by World Scientific, Singapore-New Jersey-London-Hong Kong,&#x00A0;1996. </p> <p class="bibitem" ><span class="biblabel"> [25]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe96"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Local isometry classes of Riemannian 3-manifolds with constant Ricci eigenvalues <span class="zptmcm7m-x-x-120">&#x03C1;</span><sub><span class="zptmcm7t-x-x-90">1</span></sub> <span class="zptmcm7t-x-x-120">= </span><span class="zptmcm7m-x-x-120">&#x03C1;</span><sub><span class="zptmcm7t-x-x-90">2</span></sub><span class="zptmcm7m-x-x-120">&#x2260;</span><span class="zptmcm7m-x-x-120">&#x03C1;</span><sub><span class="zptmcm7t-x-x-90">3</span></sub> <span class="zptmcm7m-x-x-120">&#x003E; </span><span class="zptmcm7t-x-x-120">0</span>,&#x00A0;<span class="ptmri7t-x-x-120">Arch.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.</span><span class="ptmri7t-x-x-120">&#x00A0;</span>(<span class="ptmri7t-x-x-120">Brno</span>) <span class="ptmb7t-x-x-120">32</span>(1996),&#x00A0;no.&#x00A0;2,&#x00A0;137&#8211;145. <br class="newline" /><a href="http://dml.cz/handle/10338.dmlcz/107562" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [26]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XInSe93"></a>Jun-iti Inogut and Masami Sekizawa:&#x00A0;Symmetries which preserve the characteristic vector field of <span class="zptmcm7m-x-x-120">K</span>-contact manifolds,&#x00A0;<span class="ptmri7t-x-x-120">Note Mat.</span>&#x00A0;<span class="ptmb7t-x-x-120">13</span>(1993),&#x00A0;no.&#x00A0;2,&#x00A0;229&#8211;236. <br class="newline" /><a href="http://siba-ese.unisalento.it/index.php/notemat/issue/view/152" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [27]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe91"></a>Masami Sekizawa:&#x00A0;Curvatures of tangent bundles with Cheeger-Gromoll metric,&#x00A0;<span class="ptmri7t-x-x-120">Tokyo J.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.</span>&#x00A0;<span class="ptmb7t-x-x-120">14</span>(1991),&#x00A0;no.&#x00A0;2,&#x00A0;407&#8211;417. <br class="newline" /><a href="http://projecteuclid.org/DPubS?service=UI&version=1.0&verb=Display&page=toc&handle=euclid.tjm/1270130369" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [28]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe88b"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Natural transformations of Riemannian metrics on manifolds to metrics on tangent bundles&#8212;A classification&#8212;,&#x00A0;<span class="ptmri7t-x-x-120">Bull.</span><span class="ptmri7t-x-x-120">&#x00A0;Tokyo Gakugei</span> <span class="ptmri7t-x-x-120">Univ.</span>&#x00A0;(4) <span class="ptmb7t-x-x-120">40</span>(1988),&#x00A0;1&#8211;29. <br class="newline" /><a href="https://ir.u-gakugei.ac.jp/handle/2309/36051/?lang=en" >Article</a> </p> <p class="bibitem" ><span class="biblabel"> [29]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe88a"></a>Masami Sekizawa:&#x00A0;Natural transformations of vector fields on manifolds to vector fields on tangent bundles,&#x00A0;<span class="ptmri7t-x-x-120">Tsukuba J.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.</span>&#x00A0;12(1988),&#x00A0;no.&#x00A0;1,&#x00A0;115&#8211;128. <br class="newline" /><a href="https://www.tulips.tsukuba.ac.jp/dspace/handle/2241/11554" >Article</a> </p> <p class="bibitem" ><span class="biblabel"> [30]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe88"></a>Masami Sekizawa:&#x00A0;Natural transformations of symmetric affine connections on manifolds to metrics on linear frame bundles:&#x00A0;a classification,&#x00A0;<span class="ptmri7t-x-x-120">Monatsh.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.</span> <span class="ptmb7t-x-x-120">105</span>(1988),&#x00A0;no.&#x00A0;3,&#x00A0;229&#8211;243. </p> <p class="bibitem" ><span class="biblabel"> [31]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe87a"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;Natural transformations of Riemannian metrics on manifolds to metrics on linear frame bundles&#8212;a classification,&#x00A0;<span class="ptmri7t-x-x-120">Differential geometry and its applications</span> (<span class="ptmri7t-x-x-120">Brno,</span><span class="ptmri7t-x-x-120">&#x00A0;1986</span>)<span class="ptmri7t-x-x-120">,</span>&#x00A0;149&#8211;178,&#x00A0;Math.&#x00A0;Appl.&#x00A0;(East European Ser.),&#x00A0;27,&#x00A0;Reidel,&#x00A0;Publ.&#x00A0;Comp.,&#x00A0;Dordrecht,&#x00A0;1987. </p> <p class="bibitem" ><span class="biblabel"> [32]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe87a"></a>Masami Sekizawa:&#x00A0;Natural transformations of affine connections on manifolds to metrics on cotangent bundles,&#x00A0;Proceedings of the 14th winter school on abstract analysis (Srni,&#x00A0;1986),&#x00A0;<span class="ptmri7t-x-x-120">Rend.</span><span class="ptmri7t-x-x-120">&#x00A0;Circ.</span><span class="ptmri7t-x-x-120">&#x00A0;Mat.</span><span class="ptmri7t-x-x-120">&#x00A0;Palermo </span>(2) Suppl.&#x00A0;No.&#x00A0;<span class="ptmb7t-x-x-120">14</span>(1987),&#x00A0;129&#8211;142. <br class="newline" /><a href="http://dml.cz/handle/10338.dmlcz/701338" >Proceedings</a> </p> <p class="bibitem" ><span class="biblabel"> [33]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe87"></a>Masami Sekizawa:&#x00A0;Lifts of generalized symmetric spaces to tangent bundles,&#x00A0;<span class="ptmri7t-x-x-120">&#x010C;asopis P</span><span class="ptmri7t-x-x-120">&#x011B;st.</span><span class="ptmri7t-x-x-120">&#x00A0;Mat.</span>&#x00A0;<span class="ptmb7t-x-x-120">112</span>(1987),&#x00A0;no.&#x00A0;3,&#x00A0;261&#8211;268. <br class="newline" /><a href="http://dml.cz/handle/10338.dmlcz/134888" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [34]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XKoSe87"></a>Old&#x0159;ich Kowalski and Masami Sekizawa:&#x00A0;On 3-dimensional Riemannian <span class="zptmcm7t-x-x-120">&#x03A3;</span>-spaces,&#x00A0;<span class="ptmri7t-x-x-120">Monatsh.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.</span>&#x00A0;<span class="ptmb7t-x-x-120">103</span>(1987),&#x00A0;no.&#x00A0;4,&#x00A0;303&#8211;320. </p> <p class="bibitem" ><span class="biblabel"> [35]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe86a"></a>Masami Sekizawa:&#x00A0;Mathematics in Prague,&#x00A0;(Japanese) <span class="ptmri7t-x-x-120">Sugaku</span> <span class="ptmb7t-x-x-120">38</span>(1986),&#x00A0;no.&#x00A0;4,&#x00A0;354&#8211;359. <br class="newline" /><a href="http://www.journalarchive.jst.go.jp/japanese/jnltoc_ja.php?cdjournal=sugaku1947&&cdvol=38&noissue=4" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [36]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe86"></a>Sekizawa,&#x00A0;Masami:&#x00A0;On complete lifts of reductive homogeneous spaces and generalized symmetric spaces,&#x00A0;<span class="ptmri7t-x-x-120">Czechoslovak</span> <span class="ptmri7t-x-x-120">Math.</span><span class="ptmri7t-x-x-120">&#x00A0;J.</span>&#x00A0;<span class="ptmb7t-x-x-120">36(111)</span>(1986),&#x00A0;no.&#x00A0;4,&#x00A0;516&#8211;534. <br class="newline" /><a href="http://dml.cz/handle/10338.dmlcz/116894" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [37]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe80"></a>Masami Sekizawa:&#x00A0;Umbilics of conformally flat submanifolds in Euclidean space,&#x00A0;<span class="ptmri7t-x-x-120">T</span><span class="ptmri7t-x-x-120">ôhoku Math.</span><span class="ptmri7t-x-x-120">&#x00A0;J.</span>&#x00A0;(2) <span class="ptmb7t-x-x-120">32</span>(1980),&#x00A0;no.&#x00A0;1,&#x00A0;99&#8211;109. <br class="newline" /><a href="http://projecteuclid.org/DPubS?service=UI&version=1.0&verb=Display&page=toc&handle=euclid.tmj/1178229676" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [38]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XOgSe76"></a>Yôsuke Ogawa and Masami Sekizawa:&#x00A0;Hypersurfaces immersed in a conformally flat Riemannian manifold,&#x00A0;<span class="ptmri7t-x-x-120">Natur.</span><span class="ptmri7t-x-x-120">&#x00A0;Sci.</span><span class="ptmri7t-x-x-120">&#x00A0;Rep.</span><span class="ptmri7t-x-x-120">&#x00A0;Ochanomizu Univ.</span>&#x00A0;<span class="ptmb7t-x-x-120">27</span>(1976),&#x00A0;no.&#x00A0;2,&#x00A0;77&#8211;87. <br class="newline" /><a href="http://www.lib.ocha.ac.jp/oab/12shizenkagaku/1976-12-01.html" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [39]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe76"></a>Masami Sekizawa:&#x00A0;Completeness of the <span class="zptmcm7m-x-x-120">k</span>-th nullity foliations,&#x00A0;<span class="ptmri7t-x-x-120">J.</span><span class="ptmri7t-x-x-120">&#x00A0;Differential</span> <span class="ptmri7t-x-x-120">Geometry </span><span class="ptmb7t-x-x-120">11</span>(1976),&#x00A0;no.&#x00A0;3,&#x00A0;461&#8211;465. </p> <p class="bibitem" ><span class="biblabel"> [40]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XTaSe75"></a>Shun-ichi Tachibana and Masami Sekizawa:&#x00A0;On the <span class="zptmcm7m-x-x-120">k</span>-th nullity space of the Riemannian curvature tensor,&#x00A0;<span class="ptmri7t-x-x-120">T</span><span class="ptmri7t-x-x-120">ôhoku Math.</span><span class="ptmri7t-x-x-120">&#x00A0;J.</span>&#x00A0;(2) <span class="ptmb7t-x-x-120">27</span>(1975),&#x00A0;25&#8211;30. <br class="newline" /><a href="http://projecteuclid.org/DPubS?service=UI&version=1.0&verb=Display&page=toc&handle=euclid.tmj/1178241027" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [41]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XTaSe74"></a>Shun-ichi Tachibana and Masami Sekizawa:&#x00A0;On the <span class="zptmcm7m-x-x-120">k</span>-th relative nullity space of a Riemannian manifold in <span class="zptmcm7m-x-x-120">E</span><sup><span class="zptmcm7m-x-x-90">N</span></sup>,&#x00A0;<span class="ptmri7t-x-x-120">Tamkang J.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.</span>&#x00A0;<span class="ptmb7t-x-x-120">5</span>(1974),&#x00A0;no.&#x00A0;1,&#x00A0;133&#8211;138. </p> <p class="bibitem" ><span class="biblabel"> [42]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe73"></a>Masami Sekizawa:&#x00A0;The nullity spaces of the conformal curvature tensor,&#x00A0;<span class="ptmri7t-x-x-120">J.</span><span class="ptmri7t-x-x-120">&#x00A0;Math.</span><span class="ptmri7t-x-x-120">&#x00A0;Soc.</span><span class="ptmri7t-x-x-120">&#x00A0;Japan </span><span class="ptmb7t-x-x-120">25</span>(1973),&#x00A0;125&#8211;131. <br class="newline" /><a href="http://projecteuclid.org/DPubS?service=UI&version=1.0&verb=Display&page=toc&handle=euclid.jmsj/1240435757" >Journal</a> </p> <p class="bibitem" ><span class="biblabel"> [43]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe71"></a>Masami Sekizawa:&#x00A0;A theorem on a manifold of constant <span class="zptmcm7m-x-x-120">&#x03C6;</span>-holomorphic sectional curvature,&#x00A0;<span class="ptmri7t-x-x-120">Tensor </span>(<span class="ptmri7t-x-x-120">N.S.</span>)&#x00A0;<span class="ptmb7t-x-x-120">22</span>(1971),&#x00A0;151&#8211;154. </p> <p class="bibitem" ><span class="biblabel"> [44]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe70"></a>Masami Sekizawa:&#x00A0;On conformal Killing tensors of degree 2 in Kählerian spaces,&#x00A0;<span class="ptmri7t-x-x-120">TRU Math.</span>&#x00A0;<span class="ptmb7t-x-x-120">6</span>(1970),&#x00A0;1&#8211;5. </p> <p class="bibitem" ><span class="biblabel"> [45]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe69"></a>Masami Sekizawa:&#x00A0;A note on the complete lift of <span class="zptmcm7t-x-x-120">&#x03A6;</span>-tensors to a tangent bundle,&#x00A0;<span class="ptmri7t-x-x-120">TRU Math.</span>&#x00A0;<span class="ptmb7t-x-x-120">5</span>(1969),&#x00A0;43&#8211;45. </p> <p class="bibitem" ><span class="biblabel"> [46]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a id="XSe68"></a>Masami Sekizawa:&#x00A0;On extended almost analytic vector fields in tangent bundles of manifolds with a non-linear connection,&#x00A0;<span class="ptmri7t-x-x-120">TRU Math.</span>&#x00A0;<span class="ptmb7t-x-x-120">4</span>(1968),&#x00A0;14&#8211;20.</p></div> </body></html>