Answer to Question #138330 in Abstract Algebra for J

Question #138330
Assume that (G,*) is a group and that (H,*) and (K,*) are subgroups of (G,*).Prove that (H intersects K , *) is a subgroup of (G,*)
1
Expert's answer
2020-10-14T18:09:56-0400

Let "a,b\\in H\\cap K". Then "a,b\\in H" and "a,b\\in K". Since "(H,*)" and "(K,*)" are subgroups of

"(G,*)", "a*b\\in H" and "a*b\\in K". By analogy for the inverse element "a^{-1}" of the element "a" in group "G" we have that "a^{-1}\\in H" and "a^{-1}\\in K". Therefore, "a*b, a^{-1}\\in H\\cap K." So, we conclude that "(H\\cap K, *)" is a subgroup of "(G,*)."


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