Open kimballmartin opened 1 year ago
Unfortunately I don't have Magma any more, but can help to debug.
Can you insert print data
just before the following line and let me know what it prints out please?
https://github.com/cjdoris/Genus2Conductor/blob/bc7326908c3f098b0327399fbe7c60f18a9c6f1a/EvenConductorExponent_Core.mag#L210
It looks like the code does not properly handle the two "Fail" cases, and I suspect you've hit that.
Thanks for the quick reply. It prints out
<"IV", "Unmr", 0, 2>
Huh OK. I'll need to ask my co-author on this algorithm.
As a workaround, you can put if UseRegularModels then return TameConductorFromRegularModel(C,p); end if;
at the top of the TameConductorFrom3Torsion
function - but this will sometimes be very slow.
OK, thanks.
For the following genus 2 curve C, which has geometric automorphism group V4, but only C2 defined over the rationals, I am running into a failed assertion.
I tried adding options
Proof := "Global"
,MobiusRandomize:=1
orMobiusRandomize:=2
to no effect.