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Possibly this is a problem in Magma or one of the packages you depend on, but if so it would be good to submit a bug in the appropriate place. This is one of several examples, which I just verified I can reproduce on Magma V2.28-11 using a fully up-to-date CHIMP install.
> C:=HyperellipticCurve(-x^5 - x^4 + 2*x^2 + 2*x + 9,x^3 + x^2);
> HeuristicDecomposition(C);
> HeuristicDecomposition(C);
In file "/home/drew/dev/magma-2.28-11/package/Geometry/RieSrf/fundamentalgroup.m", line 609, column 22:
>> if E1`r le E2`r then
^
Runtime
I note that the first call falls silently and returns nothing (but that never happens again unless you restart the Magma session).
The text was updated successfully, but these errors were encountered:
AndrewVSutherland
changed the title
Possible bug in HeuristicSplitting
Possible bug in HeuristicDecomposition
Sep 8, 2024
The problem goes away if you increase the precision.
> R<x> := PolynomialRing(RationalsExtra(100));
> C:=HyperellipticCurve(-x^5 - x^4 + 2*x^2 + 2*x + 9,x^3 + x^2);
> HeuristicDecomposition(C);
In file "/home/drew/dev/magma-2.28-8/package/Geometry/RieSrf/fundamentalgroup.m", line 609, column 22:
>> if E1`r le E2`r then
^
Runtime error in `: Attribute 'r' for this structure is valid but not assigned
Possibly this is a problem in Magma or one of the packages you depend on, but if so it would be good to submit a bug in the appropriate place. This is one of several examples, which I just verified I can reproduce on Magma V2.28-11 using a fully up-to-date CHIMP install.
I note that the first call falls silently and returns nothing (but that never happens again unless you restart the Magma session).
The text was updated successfully, but these errors were encountered: