The laitinen conjecture for finite non-solvable groups

Authors:

• Krzysztof Pawałowski,
• Toshio Sumi

Abstract

For any finite group G, we impose an algebraic condition, the G ^nil-coset condition, and prove that any finite Oliver group G satisfying the G ^nil-coset condition has a smooth action on some sphere with isolated fixed points at which the tangent G-modules are not isomorphic to each other. Moreover, we prove that, for any finite non-solvable group G not isomorphic to Aut(A 6) or PΣL(2, 27), the G ^nil-coset condition holds if and only if rG ≥ 2, where rG is the number of real conjugacy classes of elements of G not of prime power order. As a conclusion, the Laitinen Conjecture holds for any finite non-solvable group not isomorphic to Aut(A 6). Copyright © Edinburgh Mathematical Society 2012.