Yesterday, Matthew Flatt wrote:
> At Sun, 24 Jul 2011 14:44:24 +0200, Stephan Houben wrote:
> > [...] I find that summing comes up sufficiently
> > often to deserve its own compact syntax, so I propose:
> >
> > ;; Solution 3
> > (require (planet "mathsymbols.rkt" ("stephanh" "mathsymbols.plt" 1 0)))
> >
> > (Σ ([i (in-range 1 (add1 N))])
> > (string-length (integer->string i)))
>
> I agree. Unless there are objections, I plan to add `for/sum' and
> `for/product' with aliases `Σ' and `∏' to `racket/base' (as well as
> `for*/sum' and `for*/product' with aliases `Σ*' and `∏*').
On one hand I like such identifiers, but on the other there could be a
lot more. Just looking at random things, I can see `π', `→' or `⇒'
(for `=>'), `≤', `≥', `…', `∞' and `-∞', `∊' (for `member'), `√', and
many more. Maybe even `½', `¼', `¾', `-½' etc...
So how about some `racket/aliases' which is included in `racket' but
not in `racket/base' and adds some/all of these?
--
((lambda (x) (x x)) (lambda (x) (x x))) Eli Barzilay:
http://barzilay.org/ Maze is Life!
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