Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 2997 by [email protected]: collect mishandles power rules
http://code.google.com/p/sympy/issues/detail?id=2997
collect(a*y**(2*x)+b*y**(2*x),y**(x))
(a + b)*(y**2)**x
y**(2*x) is not always the same as (y**2)**x:
rep={x:-.1,y:-1}
((y**2)**x).subs(rep).n()
1.00000000000000
(y**(2*x)).subs(rep).n()
0.809016994374947 - 0.587785252292473*I
And integer on the right can join in with another exponent:
((x**y)**2)
x**(2*y)
but if it's already there (i.e. as 2*y) it can't be pulled out unless the
base is positive or the y is an integer.
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