[Agda] underscore in \neg

Wojciech Jedynak wjedynak at gmail.com
Sun Aug 25 13:03:27 CEST 2013

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)
not $ BIG,   (_$_ is available in the Function module)
while \neg allows also
\neg BIG.
So it's a matter of plain convenience.


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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