Nice one…
Indeed: sage: f.expand()(y=i) -(3735/1394*I + 405/1394)*z^3 - (606/697*I - 942/697)*z^2 - (8681/6970*I + 15973/6970)*z + 1 sage: f.partial_fraction(y)(y=i) -(3735/1394*I + 405/1394)*z^3 - (606/697*I - 942/697)*z^2 - (8681/6970*I + 15973/6970)*z + 1 sage: f.simplify_full()(y=i) -(3735/1394*I + 405/1394)*z^3 - (606/697*I - 942/697)*z^2 - (8681/6970*I + 15973/6970)*z + 1 all work. But : sage: f.simplify()(y=i) ``` doesn't return (I didn't wait for it to "eat all memory" and brutally interrupted it with a raft of C-c...). A serious bug, IMHO (because it can crash Sage in a trivial calculation...). For once, this isn't a `maxima` bug : sage: maxima_calculus.interact() → Switching to Maxima_lib ← maxima_lib: subst([y=%i], -(15*z/(17*y + 11) + 1)*(5*z/(4*y + 1) - 1)*(15 *z/(3*y - 4) + 1)); ((15*z)/(3*%i-4)+1)*((5*z)/(4*%i+1)-1)*((-(15*z)/(17*%i+11))-1) maxima_lib: → Exiting back to Sage ← ``` This is now Trac#31869 <https://trac.sagemath.org/ticket/31869> Le jeudi 27 mai 2021 à 20:20:03 UTC+2, Peter Mueller a écrit : > The following trivial code eats up all the memory and crashes with > an Unhandled SIGSEGV on my Linux machine and sage version 9.3. But it does > not work either on the sage cell! > > var('z y') > f = -(15*z/(17*y + 11) + 1)*(5*z/(4*y + 1) - 1)*(15*z/(3*y - 4) + 1) > f(y=I) > > -- Peter Mueller > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/2d33ba07-6db2-4d33-a7a7-539608a7d565n%40googlegroups.com.
