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

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Aaron Gray

Posts: 4
Registered: 9/5/13
Re: Definitions of function type - injection
Posted: Sep 5, 2013 6:13 PM
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On Thursday, 5 September 2013 22:26:09 UTC+1, peter....@gmail.com wrote:
> > Is this a strong enough and correct definition of injection ?
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>
>

> > X ? Y = ?x?X. ?y?Y ? x ? y
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> No. Your expression does not capture the 'at most' in the definition of injective.


Peter,

Can you give me a better definition ?

Is my definition a partial injection then ?

Aaron



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