Revision history of "Retraction-invariant normal subgroup"

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  • (cur | prev) 20:28, 15 June 2009Vipul (talk | contribs). . (652 bytes) (+652). . (Created page with '{{subgroup property conjunction|retraction-invariant subgroup|normal subgroup}} ==Definition== A subgroup of a group is termed a '''retraction-invariant normal subgroup...')