New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

incorrect answer for limit involving erf #10976

John-Colvin opened this Issue Apr 7, 2016 · 0 comments


None yet
1 participant
Copy link

John-Colvin commented Apr 7, 2016

>>> import sympy as sy
>>> s, x = sy.symbols('s x', real=True)
>>> sy.limit(sy.erf(s*x)/sy.erf(s), s, 0)

The correct answer is x.

can be shown by l'Hopital's rule as follows:


Cross-checked with mathematica, see also

skirpichev added a commit to diofant/diofant that referenced this issue Apr 7, 2016

Implement _erfs.eval helper
BTW, perhaps other cases of tractable functions
need some love, like this one.

Closes sympy/sympy#10976
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment