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Topic: Definitions of function type - injection
Replies: 5   Last Post: Sep 26, 2013 5:18 PM

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Peter Luschny

Posts: 11
Registered: 11/18/06
Re: Definitions of function type - injection
Posted: Sep 5, 2013 5:26 PM
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> Is this a strong enough and correct definition of injection ?

> X ? Y = ?x?X. ?y?Y ? x ? y

No. Your expression does not capture the 'at most' in the definition of injective.



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