[Agda] underscore in \neg

[Wojciech Jedynak]

Hi Sergei,

the difference is that `not` is a function, while \neg is a prefix operator.
In practice you sometimes may want to negate a big expression, say BIG.
With `not` you have a choice between
not (BIG)
and
not $ BIG,   (_$_ is available in the Function module)
while \neg allows also
\neg BIG.
So it's a matter of plain convenience.

Best,
Wojtek


2013/8/25 Sergei Meshveliani <mechvel at botik.ru>:
> (this is on Standard library lib-0.7)
>
> People,
> `not' is declared without underscore (which looks natural),
> and  `¬_' is declared with underscore.
> Why not omit this latter underscore?
>
> Regards,
>
> ------
> Sergei
>
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