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Math Help - need help on analysis

  1. #1
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    need help on analysis

    Show that if f and g are one-to-one functions such that f (compose)g is defined, then (f (compose)g)^-1= g^-1(compose)f^-1
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  2. #2
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    Quote Originally Posted by mancillaj3 View Post
    Show that if f and g are one-to-one functions such that f (compose)g is defined, then (f (compose)g)^-1= g^-1(compose)f^-1
    This is because (f\circ g)(g^{-1} \circ f^{-1}) = f \circ g \circ g^{-1} \circ f^{-1} = \text{identity}.
    Therefore, (f\circ g)^{-1} = g^{-1}\circ f^{-1}.
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