| Project/Area Number |
25400131
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Basic analysis
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| Research Institution | Kanazawa University |
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Principal Investigator |
Tohge Kazuya 金沢大学, 電子情報学系, 教授 (30260558)
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| Co-Investigator(Renkei-kenkyūsha) |
SHIMOMURA Shun 慶応義塾大学, 理工学部, 教授 (00154328)
ISHIZAKI Katsuya 放送大学, 教養部, 教授 (60202991)
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| Research Collaborator |
LAINE Ilpo 東フィンランド大学, 物理数学科, 名誉教授
KORHONEN Risto 東フィンランド大学, 物理数学科, 教授
HEITTOKANGAS Janne 東フィンランド大学, 物理数学科, 准教授
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | Nevanlinna理論 / 有理型函数 / 値分布論 / 微分方程式 / トロピカル数学 / max-plus 代数 / 超離散方程式 / 国際交流者研究 / 超離散 / ネバンリンナ理論 / max-plus代数 / 国際研究者交流 / Finland / Joensuu / トロピカル値分布論 / Nevanlinna Theory / entire function / max-plus algebra / ultradiscrete equation / differential equation |
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| Outline of Final Research Achievements |
There are known many applications of analytic functions not only to mathematics but also to a broad range of fields in science and engineering, where the essential role is played by power series expansion. Actually, most of them are functions which permit meromorphic continuation over the whole complex plane and solve some distinctive equations such as differential equations for exponential or elliptic functions. It was 90 years ago when Rolf Nevanlinna established his theory on value distribution of the tanscendental meromorphic functions. Our study observed the question whether such contributions can be done only with complex analysis or there is a possible replacement of the role. It is our main result that we have formulated the tropical analogues of the complex analytic counterparts as a sort of dictionary in a satisfactly fashion for our purpose. In fact, it is found that there is a chance for similar applications by some tropical entire functions with max-plus series expansion.
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