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>> No.9194859 [View]
File: 1.31 MB, 3264x2448, IMG_6072.jpg [View same] [iqdb] [saucenao] [google]
9194859

>>9194817
Wrong. You can't say f^-1 exists when that is what you want to prove.

You need to construct it and prove it works. See pic related for rigor.

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