Localized a bit further:
var("q A")
p = A*(1+1/A)-A-1
V=(q^p)._maxima_().rectform()
after this, V._sage_() crashes, and I think it's the same crash as above.
Transcribing what V is in maxima, we get:
I*sin(atan2(0,q)*((1/A+1)*A-A-1))*abs(q)^((1/A+1)*A-A-1)+cos(atan2(0,q)*((1/A+1)*A-A-1))*abs(q)^((1/A+1)*A-A-1)
which indeed causes a crash when input directly into sage. More simply:
var("q A")
U=atan2(0,q)*((1/A+1)*A-A-1)
sin(U) #this crashes
It looks like an infinite recursion, so probably the constructor (of sin?)
tries to do some simplification, which ends up trying to construct the same
expression again. The traceback implicates Pynac.
On Monday, 29 May 2023 at 13:07:50 UTC-7 dwb...@gmail.com wrote:
> I was shown the following way of getting a segmentation fault in Sage.
>
> sage: var("q A")
> sage: p = A*(1+1/A)-A-1
> sage: (q^p).full_simplify()
>
> This consistently causes a crash. The person who found it was doing some
> actual work, got a crash, and boiled it down to a minimal example.
>
> Daniel Bump
>
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