document.write( "Question 1158368: Let H be a subgroup of G. Show that H is normal if and only
\n" ); document.write( "if ghg−1 ∈ H for every g ∈ G, h ∈ H. Another way of writing
\n" ); document.write( "this is: gHg−1 = H for every g ∈ G. \n" ); document.write( "

Algebra.Com's Answer #781306 by ikleyn(52771) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( "It is the definition of the normal subgroup.\r
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