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Keita Yokoyama

Professor

Tohoku University

Japan

Research Interests

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Professors in Japan

Articles (9)

Year:

2026

Year:

2025

Year:

2025

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2023

Year:

2023

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2021

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2020

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2020

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2020

Collaborators (2)

David Fernández-Duque

Ghent University

BELGIUM

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Paul Shafer

Associate Professor

University of Leeds

UNITED KINGDOM

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Keita Yokoyama

Research Interests

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Articles (9)

Π40 conservation of Ramsey's theorem for pairs

On the Π21 consequences of Π11-CA0

A PARAMETERIZED HALTING PROBLEM, $ \Delta _0$ TRUTH AND THE MRDP THEOREM

EXTENDED FRAMES AND SEPARATIONS OF LOGICAL PRINCIPLES

HOW STRONG IS RAMSEY’S THEOREM IF INFINITY CAN BE WEAK?

THE REVERSE MATHEMATICS OF THEOREMS OF JORDAN AND LEBESGUE

Ekeland’s variational principle in weak and strong systems of arithmetic

Combinatorial principles equivalent to weak induction

Some upper bounds on ordinal-valued Ramsey numbers for colourings of pairs

Collaborators (2)

David Fernández-Duque

Paul Shafer

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