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math.NT2020
Arithmetic Orr invariants of absolute Galois groups
Hisatoshi Kodani, Yuji Terashima
Based on the analogies between mapping class groups and absolute Galois groups, we introduce an arithmetic pro- analogue of Orr invariants for a Galois element associated wit…
math.NT2016
Arithmetic topology in Ihara theory
Hisatoshi Kodani, Masanori Morishita, Yuji Terashima
Ihara initiated to study a certain Galois representation which may be seen as an arithmetic analogue of the Artin representation of a pure braid group. We pursue the analogies in I…