inverse of an isomorphism is an isomorphism from G onto G'

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#inverse of an isomorphism is an isomorphism from G onto G'
#inverse of an
#isomorphism is an isomorphism
#from G onto G'
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Hello, can you please explain to me how phi inverse exist since phi is 1-1 and onto? I am having trouble wrapping my head around that.

davidcontreras
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