Updates:
Owner: mattpap
Cc: -mattpap
Labels: Milestone-Release0.7.0
Comment #8 on issue 2132 by mattpap: Derivative of RootSum
http://code.google.com/p/sympy/issues/detail?id=2132
viete() function was added in 8f8e6a786b0d0e15a65b01a68367532a0cac55b7 to
polys11, e.g.:
In [1]: var('a:d,r1:4')
Out[1]: (a, b, c, d, r₁, r₂, r₃)
In [2]: viete(a*x**3 + b*x**2 + c*x + d, [r1, r2, r3], x)
Out[2]:
⎡⎛ -b⎞ ⎛ c⎞ ⎛ -d⎞⎤
⎢⎜r₁ + r₂ + r₃, ──⎟, ⎜r₁⋅r₂ + r₁⋅r₃ + r₂⋅r₃, ─⎟, ⎜r₁⋅r₂⋅r₃, ──⎟⎥
⎣⎝ a ⎠ ⎝ a⎠ ⎝ a ⎠⎦
Now I'm refactoring and fixing RootSum and adding support for automatic
simplification of rational functions.
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