Kotaro Yamada

2.4k total citations
63 papers, 1.1k citations indexed

About

Kotaro Yamada is a scholar working on Geometry and Topology, Applied Mathematics and Astronomy and Astrophysics. According to data from OpenAlex, Kotaro Yamada has authored 63 papers receiving a total of 1.1k indexed citations (citations by other indexed papers that have themselves been cited), including 53 papers in Geometry and Topology, 52 papers in Applied Mathematics and 12 papers in Astronomy and Astrophysics. Recurrent topics in Kotaro Yamada's work include Geometric Analysis and Curvature Flows (49 papers), Geometry and complex manifolds (26 papers) and Geometric and Algebraic Topology (21 papers). Kotaro Yamada is often cited by papers focused on Geometric Analysis and Curvature Flows (49 papers), Geometry and complex manifolds (26 papers) and Geometric and Algebraic Topology (21 papers). Kotaro Yamada collaborates with scholars based in Japan, Spain and South Korea. Kotaro Yamada's co-authors include Masaaki Umehara, Kentaro Saji, Wayne Rossman, Masatoshi Kokubu, Shoichi Fujimori, Takeshi Sasaki, Seong-Deog Yang, Masaaki Yoshida, Francisco Martín and Masaru Hasegawa and has published in prestigious journals such as Journal of Cleaner Production, Annals of Mathematics and Transactions of the American Mathematical Society.

In The Last Decade

Kotaro Yamada

59 papers receiving 881 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Kotaro Yamada Japan 15 883 777 202 127 123 63 1.1k
Masaaki Umehara Japan 18 1.1k 1.3× 1.0k 1.3× 285 1.4× 157 1.2× 171 1.4× 98 1.4k
Shyūichi Izumiya Japan 17 679 0.8× 493 0.6× 338 1.7× 275 2.2× 83 0.7× 98 935
Wayne Rossman Japan 13 472 0.5× 390 0.5× 94 0.5× 144 1.1× 71 0.6× 63 650
Marian Ioan Munteanu Romania 18 777 0.9× 643 0.8× 383 1.9× 66 0.5× 50 0.4× 66 951
Donghe Pei China 17 619 0.7× 394 0.5× 371 1.8× 182 1.4× 77 0.6× 98 824
Thomas E. Cecil United States 16 847 1.0× 769 1.0× 407 2.0× 89 0.7× 128 1.0× 35 1.0k
Franki Dillen Belgium 25 1.7k 1.9× 1.3k 1.7× 881 4.4× 141 1.1× 72 0.6× 117 1.8k
Pascual Lucas Spain 16 486 0.6× 356 0.5× 329 1.6× 91 0.7× 31 0.3× 53 633
Leopold Verstraelen Belgium 23 1.4k 1.6× 1.1k 1.4× 895 4.4× 108 0.9× 50 0.4× 125 1.6k
J.-H. Eschenburg Germany 16 987 1.1× 856 1.1× 422 2.1× 42 0.3× 303 2.5× 51 1.3k

Countries citing papers authored by Kotaro Yamada

Since Specialization
Citations

This map shows the geographic impact of Kotaro Yamada's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Kotaro Yamada with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Kotaro Yamada more than expected).

Fields of papers citing papers by Kotaro Yamada

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Kotaro Yamada. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Kotaro Yamada. The network helps show where Kotaro Yamada may publish in the future.

Co-authorship network of co-authors of Kotaro Yamada

This figure shows the co-authorship network connecting the top 25 collaborators of Kotaro Yamada. A scholar is included among the top collaborators of Kotaro Yamada based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Kotaro Yamada. Kotaro Yamada is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Tarroja, Brian, et al.. (2025). Estimating the electricity system benefits of scaling up E-bike usage in California. Journal of Cleaner Production. 492. 144840–144840.
2.
3.
Umehara, Masaaki, et al.. (2020). Null hypersurfaces in Lorentzian manifolds with the null energy condition. Journal of Geometry and Physics. 155. 103751–103751. 1 indexed citations
4.
Umehara, Masaaki, et al.. (2019). Space-like maximal surfaces containing entire null lines in Lorentz-Minkowski 3-space. Proceedings of the Japan Academy Series A Mathematical Sciences. 95(9). 6 indexed citations
5.
Koiso, Miyuki, et al.. (2017). Mixed type surfaces with bounded mean curvature in 3-dimensional space-times. Differential Geometry and its Applications. 52. 64–77. 9 indexed citations
6.
Fujimori, Shoichi, et al.. (2017). Analytic extension of Jorge-Meeks type maximal surfaces in Lorentz-Minkowski 3-space. Osaka Journal of Mathematics. 54(2). 249–272. 8 indexed citations
7.
Saji, Kentaro, Masaaki Umehara, & Kotaro Yamada. (2017). An index formula for a bundle homomorphism of the tangent bundle into a vector bundle of the same rank, and its applications. Journal of the Mathematical Society of Japan. 69(1). 5 indexed citations
8.
Hasegawa, Masaru, et al.. (2015). Intrinsic properties of surfaces with singularities. International Journal of Mathematics. 26(4). 1540008–1540008. 16 indexed citations
9.
Saji, Kentaro, Masaaki Umehara, & Kotaro Yamada. (2010). The duality between singular points and inflection points on wave fronts. Osaka Journal of Mathematics. 47(2). 591–607. 10 indexed citations
10.
Saji, Kentaro, Masaaki Umehara, & Kotaro Yamada. (2010). Singularities of Blaschke normal maps of convex surfaces. Comptes Rendus Mathématique. 348(11-12). 665–668. 2 indexed citations
11.
Umehara, Masaaki & Kotaro Yamada. (2010). Applications of a completeness lemma in minimal surface theory to various classes of surfaces. Bulletin of the London Mathematical Society. 43(1). 191–199. 9 indexed citations
12.
Kokubu, Masatoshi, Wayne Rossman, Masaaki Umehara, & Kotaro Yamada. (2009). Asymptotic behavior of flat surfaces in hyperbolic 3-space. Journal of the Mathematical Society of Japan. 61(3). 12 indexed citations
13.
Sasaki, Takeshi, Kotaro Yamada, & Masaaki Yoshida. (2008). DERIVED SCHWARZ MAP OF THE HYPERGEOMETRIC DIFFERENTIAL EQUATION AND A PARALLEL FAMILY OF FLAT FRONTS. International Journal of Mathematics. 19(7). 847–863. 9 indexed citations
14.
Fujimori, Shoichi, Kentaro Saji, Masaaki Umehara, & Kotaro Yamada. (2005). Cuspidal cross caps and singularities of maximal surfaces. arXiv (Cornell University). 5 indexed citations
15.
Kokubu, Masatoshi, Wayne Rossman, Kentaro Saji, Masaaki Umehara, & Kotaro Yamada. (2005). Singularities of flat fronts in hyperbolic space. Pacific Journal of Mathematics. 221(2). 303–351. 121 indexed citations
16.
Kokubu, Masatoshi, Masaaki Umehara, & Kotaro Yamada. (2003). An elementary proof of small's formula for null curves in PSL(2, C) and an analogue for Legendrian curves in PSL(2, C). Osaka Journal of Mathematics. 40(3). 697–715. 29 indexed citations
17.
Umehara, Masaaki & Kotaro Yamada. (1997). A duality on $CMC$-1 surfaces in hyperbolic space,and a hyperbolic analogue of the Osserman Inequality. Project Euclid (Cornell University). 21(1). 31 indexed citations
18.
Rossman, Wayne, Masaaki Umehara, & Kotaro Yamada. (1997). Irreducible constant mean curvature $1$ surfaces in hyperbolic space with positive genus. Tohoku Mathematical Journal. 49(4). 32 indexed citations
19.
Umehara, Masaaki & Kotaro Yamada. (1996). Another Construction of a CMC-1 Surface in $H^3$. Kyungpook mathematical journal. 35(3). 831–831. 5 indexed citations
20.
Tasaki, Hiroyuki, Masaaki Umehara, & Kotaro Yamada. (1991). Deformations of symmetric spaces of compact type to their noncompact duals. Japanese journal of mathematics. 17(2). 383–399. 2 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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