Updates:
Status: WontFix
Owner: ---
Comment #3 on issue 574 by mattpap: apart: rewrite 'expr' using the
binomial theorem
http://code.google.com/p/sympy/issues/detail?id=574
Recently I added partial fraction decomposition algorithm based on
undetermined coefficients method (see polys11), e.g.:
In [1]: var('a,b,c,d,e')
Out[1]: (a, b, c, d, e)
In [2]: apart(1/(x-a)/(x-b),x)
Out[2]:
1 1
───────────────── + ────────────────
(-a + b)⋅(-b + x) (-a + x)⋅(a - b)
In [3]: apart(1/(x-a)/(x-b)/(x-c),x)
Out[3]:
1
1 1
─────────────────────────────── + ──────────────────────────────── +
───────────────────────────────
⎛ 2 ⎞ ⎛ 2
⎞ ⎛ 2⎞
(-a + x)⋅⎝a - a⋅b - a⋅c + b⋅c⎠ (-b + x)⋅⎝-a⋅b + a⋅c + b - b⋅c⎠ (-c +
x)⋅⎝a⋅b - a⋅c - b⋅c + c ⎠
The previous method is still available via full=True keyword argument.
This way the workaround suggested in this issue is no more necessary to
obtain simplified partial fractions with symbolic coefficients. Marking
this issue as WontFix.
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