Am 03.07.16 um 13:01 schrieb Marko Rauhamaa: > Alain Ketterlin <alain at universite-de-strasbourg.fr.invalid>: > >> It would be very confusing to have a variable named ∇f, as confusing >> as naming a variable a+b or √x. > > Scheme allows *any* characters whatsoever in identifiers. Parentheses? Christian