Comment #2 on issue 3829 by [email protected]: Should Integral.subs
(and Subs(Integral)) on an indefinite integral return an integral with two
limits
http://code.google.com/p/sympy/issues/detail?id=3829
Hi, I am +1 to the idea of subs acting on a definite integral, which
substitutes the new value after the integral is evaluated.
This would also work in cases like,
1] Integral(x, x).subs(x, sin(x))
which should return
Integral(x, (x, sin(x)))
sin(x)
⌠
⎮ x dx
⌡
where xreplace gives a ValueError.
However I am a bit confused about what subs on a definite integral should
do. Suppose
1] Integral(x, (x, 2, 3)).subs(x, y)
will return Integral(y, (y, 2, 3))
But what if, the new expression in subs is an expression in y,
For Example:
Integral(x, (x, 2, 3)).subs(x, y**2)
then one has to find the relationship between dx and dy. Or is it enough if
a ValueError is returned?
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