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FIRST-ORDER RECOGNIZABILITY IN FINITE AND PSEUDOFINITE GROUPS
Published online by Cambridge University Press: 20 July 2020
Abstract
It is known that there exists a first-order sentence that holds in a finite group if and only if the group is soluble. Here it is shown that the corresponding statements with ‘solubility’ replaced by ‘nilpotence’ and ‘perfectness’, among others, are false.
These facts present difficulties for the study of pseudofinite groups. However, a very weak form of Frattini’s theorem on the nilpotence of the Frattini subgroup of a finite group is proved for pseudofinite groups.
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- © The Association for Symbolic Logic 2020
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