Schur cover of alternating group:A7

Definition
This group, termed the Schur cover of alternating group:A7 and sometimes denoted $$6 \cdot A_7$$, is defined in the following equivalent ways:


 * 1) It is the unique quasisimple group with center cyclic group:Z6 and quotient group alternating group:A7.
 * 2) It is the defining ingredient::Schur covering group of defining ingredient::alternating group:A7.