1 | initial version |
FWIW :
sage: sum(x^j/factorial(j),j,0,oo)
e^x
sage: sum(x^j/factorial(j),j,0,oo).subs(x==0)
1
sage: sum(x^j/factorial(j),j,0,oo).limit(x=0)
1
but :
sage: sum(0^j/factorial(j),j,0,oo)
0
is indeed a bug, bound to Trac#22027, as you pointed out, which I have updated.