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Gassmann triple : ウィキペディア英語版
Gassmann triple
In mathematics, a Gassmann triple (or Gassmann-Sunada triple) is a group ''G'' together with two faithful actions on sets ''X'' and ''Y'', such that ''X'' and ''Y'' are not isomorphic as ''G''-sets but every element of ''G'' has the same number of fixed points on ''X'' and ''Y''. They were introduced by Fritz Gassmann in 1926.
==Applications==
Gassmann triples have been used to construct examples of pairs of mathematical objects with the same invariants that are not isomorphic, including arithmetically equivalent number fields and isospectral graphs and isospectral Riemannian manifolds.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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