[Haskell-cafe] Re: [Haskell-beginners] map question

[Thomas Davie]

On 18 Sep 2009, at 04:32, Gregory Propf wrote:

> Heh, perhaps we should petition to have a new computer key and  
> symbol added to the world's way of writing maths, something like  
> maybe a downward angled slash to mean prefix (-)

Such a symbol already exists, but isn't in the ASCII set:

(-) (unicode 0x2D) "hyphen minus"
and
(‐) (unicode 0x2010) "hyphen"
are not the same as
(−) (unicode 0x2200) "minus sign"

notably also, not the same as ‒, –, — and ― (figure dash, en- 
dash, em-dash and horizontal bar).

Bob