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Toshihisa Urahigashi

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#large language models Open access Oct 2026

A local non-containment in Step (v) of IUT IV, Theorem 1.10

Step (v) of the proof of Theorem 1.10 in Mochizuki's Inter-universal Teichmüller theory IV bounds, for each tuple of places, the log-volume of the corresponding component of the holomorphic hull of the union of possible images of a Θ-pilot object defined in Corollary 3.12 of the third paper. This note gives an explicit...

Toshihisa Urahigashi · 0 citations
#large language models Open access Oct 2026

A local non-containment in Step (v) of IUT IV, Theorem 1.10

Step (v) of the proof of Theorem 1.10 in Mochizuki's Inter-universal Teichmüller theory IV bounds, for each tuple of places, the log-volume of the corresponding component of the holomorphic hull of the union of possible images of a Θ-pilot object defined in Corollary 3.12 of the third paper. This note gives an explicit...

Toshihisa Urahigashi · 0 citations
#large language models Open access Sep 2026

hyper-tamari: the Lean 4 developments accompanying "Evaluation orders on bracketings in the hyperoperation hierarchy"

The Lean 4 developments accompanying the paper Evaluation orders on bracketings in the hyperoperation hierarchy by Toshihisa Urahigashi. Let H_r be the Goodstein hyperoperation hierarchy (H_1 addition, H_2 multiplication, H_3 exponentiation, H_4 tetration). For r ≥ 3 the operation is non-associative, so the value of a...

Toshihisa Urahigashi · 0 citations

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