Dear Carl,
On Dec 3, 10:14 pm, Carl Witty <[EMAIL PROTECTED]> wrote:
-- snip --
> > > Simon pointed out that there is precedence for injecting variables
> > > that appear on the left side of an equals sign, using "R.<x> = QQ[]" as an
> > > example.
>
> > > Any comments or thoughts?
>
> > I think this is very useful.
>
> I have no idea which "this" you're talking about.
Neither have I. But I do think that the current behaviour is
consistent, sufficiently simple, and likeable:
-- All items on the left hand side of an assignment will be assigned
--
This is so in
sage: R.<x>=QQ[]
and in
sage: (a,b) = 3,5
and eventually also in
sage: f(x) = sin(x)
I don't like the counterargument that "x" only is a temporary
variable, from a mathematical point of view. In a math book, I would
not define f(x)=sin(x), but I would do:
f: RR ---> RR
x |-> sin(x)
in order to make clear that "x" is just a temporary notation.
Of course, funny things happen if you define
sage: f(sin)=sin(sin)
but so is life...
Best regards,
Simon
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