Dear all,
I have learned to substitute variables into equations
using .subs(locals()) or .subs(globals()). However, if variables are
defined in a nested way, this has to be done again and again. Is there
a command to substitute all variables into each other? Here is an
example:
sage: var ('a b c')
(a, b, c)
sage: f = x^a
sage: a = b^2
sage: b = 1/c
sage: c = 3
sage: f.subs(globals())
x^b^2
sage: f.subs(globals()).subs(globals())
x^(1/c^2)
sage: f.subs(globals()).subs(globals()).subs(globals())
x^(1/9)
It should be easy to write a function repeating the .subs(globals())
command until f does not change any more, but before I do this, I
thought I'd better ask if something like this already exists.
Thanks for your help!
Regards,
Stan
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