Comment #1 on issue 3099 by ronan.l...@gmail.com: bin/test sympy/core is
very slow
http://code.google.com/p/sympy/issues/detail?id=3099
c1440868c545d2d43b789b48858de0f1b4d70c22 is the first bad commit
commit c1440868c545d2d43b789b48858de0f1b4d70c22
Author: Chris Smith <smi...@gmail.com>
Date: Wed Feb 22 19:58:52 2012 +0545
add judicious numerical testing to is_constant and equals
The _random method was added to expr to fascilitate testing.
That routine is described by its docstring.
The judiciousness of the new testing comes from using evalf
to disprove (rather than prove) something is constant or that
two expressions are equal. e.g. to disprove that something is
constant, one need only substitute in two different values and
see if they are different or not. If different, the expression
cannot be constant. If the two values are the same, *or* if
no significance could be obtained (because, perhaps, the expression
is zero) then no conclusion is drawn.
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