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Who invented the brilliant $\mapsto$ notation for describing a function's action on a point, as in $x \mapsto x^2$?

This is in some sense a counterpart to Who came up with the arrow notation $x \rightarrow y$?

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It could have only been this guy –  Mike F Jul 26 '13 at 1:53
    
And further, why do both it and lambda expressions exist? –  James Wood Jul 18 at 12:11
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