how about ex(c=1) ?
On Sun, Nov 14, 2021 at 11:25 AM 'Martin R' via sage-support
<sage-support@googlegroups.com> wrote:
>
> I would expect subs to replace c with 1, but it doesn't. Why?
>
> sage: S.<a, b, c, d, e, f, g> = QQ[]
> sage: R.<x> = S[]
> sage: ex = (a*x+b)/(c*x + d) - (e*x+f)/(g*c*x + g*d)
> sage: ex
> ((a*g - e)*x + b*g - f)/(c*g*x + d*g)
> sage: ex.subs(c=1)
> ((a*g - e)*x + b*g - f)/(c*g*x + d*g)
> sage: ex.subs({c:1})
> ((a*g - e)*x + b*g - f)/(c*g*x + d*g)
>
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