Hello,
I'm trying to prove the following system has no solution using sympy (one
of my first attempt to use sympy) :
a_1 = Symbol('a_1')
a_2 = Symbol('a_2')
a_3 = Symbol('a_3')
a_4 = Symbol('a_4')
b_1 = Symbol('b_1')
b_2 = Symbol('b_2')
b_3 = Symbol('b_3')
b_4 = Symbol('b_4')
system = [
a_1*b_2 - a_2*b_1 - 1,
a_1*b_3 - a_3*b_1,
a_1*b_4 - a_4*b_1,
a_2*b_3 - a_3*b_2,
a_2*b_4 - a_4*b_2,
a_3*b_4 - a_4*b_3 - 1
]
unknowns = [
a_1, a_2, a_3, a_4, b_1, b_2, b_3, b_4
]
result = solve(system, unknowns)
I expect result would be an empty dictionary but an exception is raised :
Traceback (most recent call last):
File "D:\Sandbox\galgebra\tests\test_chapter2.py", line 162, in test
R = solve(system, unknowns)
File
"D:\Tools\WinPython-2.7\python-2.7.10.amd64\lib\site-packages\sympy\solvers\solvers.py",
line 911, in solve
solution = _solve_system(f, symbols, **flags)
File
"D:\Tools\WinPython-2.7\python-2.7.10.amd64\lib\site-packages\sympy\solvers\solvers.py",
line 1522, in _solve_system
raise NotImplementedError('no valid subset found')
NotImplementedError: no valid subset found
Best regards
Sylvain
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