Keiji Izuchi

539 total citations
64 papers, 363 citations indexed

About

Keiji Izuchi is a scholar working on Applied Mathematics, Mathematical Physics and Algebra and Number Theory. According to data from OpenAlex, Keiji Izuchi has authored 64 papers receiving a total of 363 indexed citations (citations by other indexed papers that have themselves been cited), including 52 papers in Applied Mathematics, 42 papers in Mathematical Physics and 31 papers in Algebra and Number Theory. Recurrent topics in Keiji Izuchi's work include Holomorphic and Operator Theory (45 papers), Advanced Topics in Algebra (28 papers) and Advanced Banach Space Theory (25 papers). Keiji Izuchi is often cited by papers focused on Holomorphic and Operator Theory (45 papers), Advanced Topics in Algebra (28 papers) and Advanced Banach Space Theory (25 papers). Keiji Izuchi collaborates with scholars based in Japan, United States and Ghana. Keiji Izuchi's co-authors include Takahiko Nakazi, Dechao Zheng, Shûichi Ohno, Pamela Gorkin, Raymond Mortini, Rongwei Yang, Hiroyuki Takagi, Kunyu Guo, Seiji Watanabe and Sin‐Ei Takahasi and has published in prestigious journals such as Journal of Mathematical Analysis and Applications, Transactions of the American Mathematical Society and Journal of Functional Analysis.

In The Last Decade

Keiji Izuchi

54 papers receiving 307 citations

Peers

Keiji Izuchi
George Costakis Greece
Kunyu Guo China
Dragan Vukotić Spain
B. Yousefi Iran
Francisco J. Fernández-Polo Spain
P. G. Dixon United Kingdom
Étienne Matheron France
Vladimir Chilin Uzbekistan
Nico Spronk Canada
M. B. Abrahamse United States
George Costakis Greece
Keiji Izuchi
Citations per year, relative to Keiji Izuchi Keiji Izuchi (= 1×) peers George Costakis

Countries citing papers authored by Keiji Izuchi

Since Specialization
Citations

This map shows the geographic impact of Keiji Izuchi'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 Keiji Izuchi with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Keiji Izuchi more than expected).

Fields of papers citing papers by Keiji Izuchi

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Keiji Izuchi. 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 Keiji Izuchi. The network helps show where Keiji Izuchi may publish in the future.

Co-authorship network of co-authors of Keiji Izuchi

This figure shows the co-authorship network connecting the top 25 collaborators of Keiji Izuchi. A scholar is included among the top collaborators of Keiji Izuchi 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 Keiji Izuchi. Keiji Izuchi 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.
Izuchi, Keiji, et al.. (2012). Wandering subspaces and the Beurling type theorem, III. Journal of the Mathematical Society of Japan. 64(2). 2 indexed citations
2.
Izuchi, Keiji, et al.. (2005). Essential norms of differences of composition operators on $\bm{H^\infty}$. Journal of the Mathematical Society of Japan. 57(3). 17 indexed citations
3.
Izuchi, Keiji, et al.. (2005). Rank-one commutators on invariant subspaces of the Hardy space on the bidisk. Journal of Mathematical Analysis and Applications. 316(1). 1–8. 9 indexed citations
4.
Chen, Xiaoman, Kunyu Guo, Keiji Izuchi, & Dechao Zheng. (2005). Compact Perturbations of Hankel Operators. Journal für die reine und angewandte Mathematik (Crelles Journal). 2005(578). 1–48. 3 indexed citations
5.
Gorkin, Pamela, Keiji Izuchi, & Raymond Mortini. (2003). Sequences separating fibers in the spectrum of H∞. Topology and its Applications. 129(3). 221–238. 1 indexed citations
6.
Izuchi, Keiji. (2001). Singular inner functions of L1-type II. Journal of the Mathematical Society of Japan. 53(2). 4 indexed citations
7.
Gorkin, Pamela, Keiji Izuchi, & Raymond Mortini. (2000). Higher Order Hulls in H∞, II. Journal of Functional Analysis. 177(1). 107–129. 8 indexed citations
8.
Izuchi, Keiji, et al.. (1999). SINGULAR INNER FUNCTIONS OF $L^{1}-TYPE$. Journal of the Korean Mathematical Society. 36(4). 787–811. 4 indexed citations
9.
Izuchi, Keiji, Hiroyuki Takagi, & Seiji Watanabe. (1996). Sequential BKW-Operators and Function Algebras. Journal of Approximation Theory. 85(2). 185–200. 4 indexed citations
10.
Izuchi, Keiji & Sin‐Ei Takahasi. (1996). BKW-Operators on the Interval and the Sequence Spaces. Journal of Approximation Theory. 87(2). 159–169. 1 indexed citations
11.
Izuchi, Keiji. (1991). Interpolating sequences in the maximal ideal space of H∞. Journal of the Mathematical Society of Japan. 43(4). 6 indexed citations
12.
Izuchi, Keiji. (1986). A geometrical characterization of singly generated Douglas algebras. Proceedings of the American Mathematical Society. 97(3). 410–412. 1 indexed citations
13.
Izuchi, Keiji. (1986). QC-level sets and quotients of Douglas algebras. Journal of Functional Analysis. 65(3). 293–308. 15 indexed citations
14.
Izuchi, Keiji, et al.. (1984). ANNIHILATING MEASURES FOR DOUGLAS ALGEBRAS. The Yokohama mathematical journal = 横濱市立大學紀要. D部門, 数学. 32(1). 135–151. 6 indexed citations
15.
Izuchi, Keiji, et al.. (1984). EXTREME AND EXPOSED POINTS IN QUOTIENTS OF DOUGLAS ALGEBRAS BY ＄H^{￥infty}＄ OR ＄H^{￥infty}+C＄. Yokohama National University Repository (Yokohama National University). 32(1). 45–54. 1 indexed citations
16.
Izuchi, Keiji. (1979). Convolution powers of singular-symmetric measures. Journal of the Mathematical Society of Japan. 31(1). 4 indexed citations
17.
Izuchi, Keiji. (1977). Convolution Powers of Singular-Symmetric Measures. II. Proceedings of the American Mathematical Society. 65(2). 313–313. 1 indexed citations
18.
Izuchi, Keiji. (1977). Convolution powers of singular-symmetric measures. II. Proceedings of the American Mathematical Society. 65(2). 313–317. 1 indexed citations
19.
Izuchi, Keiji. (1975). On a Problem of J. L. Taylor. Proceedings of the American Mathematical Society. 53(2). 347–347. 1 indexed citations
20.
Izuchi, Keiji. (1975). On a problem of J. L. Taylor. Proceedings of the American Mathematical Society. 53(2). 347–352. 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.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by George Costakis Breakdown of academic impact, for papers by Kunyu Guo Breakdown of academic impact, for papers by Dragan Vukotić Breakdown of academic impact, for papers by B. Yousefi Breakdown of academic impact, for papers by Francisco J. Fernández-Polo Breakdown of academic impact, for papers by P. G. Dixon Breakdown of academic impact, for papers by Étienne Matheron Breakdown of academic impact, for papers by Vladimir Chilin Breakdown of academic impact, for papers by Nico Spronk Breakdown of academic impact, for papers by M. B. Abrahamse
Rankless by CCL
2026