If a group $G$ have two subgroups $A,B$ which are isomorphic. Can I say that $A\lhd G$ if $B\lhd G$?
Indeed we often do in this way when we don't considerate about the concrete set of groups.
2026-03-26 09:38:35.1774517915
Ambiguity of the notation $\lhd$
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