Am 31.03.2015 um 15:06 schrieb Arnaud Usciati:
Hello everybody,
I tried values with acosh function and I found an issue.
Suppose x = symbols('x', real=True) and f = lambda x: acosh(-x).
Just a heads-up: the x inside the lambda is unrelated to the symbol x.
But f(x) returns -acosh(x) instead of acosh(-x) !
I did a bit more testing and found I wouldn't need f, or the real=True
assumption on x:
$ python
Python 2.6.9 (unknown, Dec 26 2014, 22:51:25)
[GCC 4.8.2] on linux3
Type "help", "copyright", "credits" or "license" for more information.
>>> from sympy import Symbol, acosh
>>> x = Symbol('x')
>>> acosh(-x)
-acosh(x)
This looks indeed like a bug to me.
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