Classifying $p$-groups via their multiplier

TL;DR

This paper characterizes non-abelian p-groups with a specific Schur multiplier size, focusing on the case where the parameter s(G) equals 2, extending previous classifications.

Contribution

It provides a complete characterization of p-groups with s(G)=2, building upon earlier work that characterized groups with s(G)=0.

Findings

Characterization of p-groups with s(G)=2.

Extension of previous classifications for s(G)=0.

Deeper understanding of Schur multiplier structure in p-groups.

Abstract

The author in $($On the order of Schur multiplier of non-abelian $p$-groups. J. Algebra (2009).322: 4479--4482$)$ showed that for any $p$-group $G$ of order $p^n$ there exists a nonnegative integer $s(G)$ such that the order of Schur multiplier of $G$ is equal to $p^{\f{1}{2}(n-1)(n-2)+1-s(G)}$. Furthermore, he characterized the structure of all non-abelian $p$-groups $G$ when $s(G)=0$. The present paper is devoted to characterization of all $p$-groups when $s(G)=2$.