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A note about solvable and non-solvable finite groups of the same order type

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arxiv 2408.07732 v1 pith:OQQ2HKJX submitted 2024-08-14 math.GR

classification math.GR
keywords ordergroupssametypecdot3cdot7examplefinite
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abstract

Two finite groups are said to have the same order type if for each positive integer $n$ both groups have the same number of elements of order $n$. In 1987 John G. Thompson asked if in this case the solvability of one group implies the solvability of the other group. In 2024 Pawel Piwek gave a negative example. He constructed two groups of order $2^{365}\cdot3^{105}\cdot7^{104}\approx7.3\cdot10^{247}$ of the same order type, where only one is solvable. In this note we produce a much smaller example of order $2^{13}\cdot3^4\cdot7^3=227598336$.

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  1. Arithmetic invariants for finite simple and related groups

    math.GR 2026-08 conditional novelty 5.0 of 10

    The paper proposes a delta-invariant encoding of element orders, class sizes, and character degrees that unifies characterization results for finite simple and related groups.

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