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On some invariants preserved by isomorphisms of tables of marks
Mots-clés :
Group representation, Burnside rings, table of marks (en)Representación de grupos, anillo de Burnside, tabla de marcas (es)
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Abstract. Let G and Q be groups with isomorphic tables of marks, and for each subgroup H of G, let H' denote a subgroup of Q assigned to H under an isomorphism between the tables of marks of G and Q. We prove that if H is cyclic/elementary abelian/maximal/the Frattini subgroup/the commutator subgroup, then H' has the same property. However, we give examples where H is abelian and H' is not, and where H is the centre of G and H' is not the centre of Q. For this we construct (using GAP) the smallest example of non-isomorphic groups with isomorphic tables of marks.
Références
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