Fix a case where Coefficients(B,v) returned a list instead of fail although the vector v did not lie in the underlying vector space V of B
#5335
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ThomasBreuer
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kind: bug: wrong result
ThomasBreuer
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Jan 19, 2023
- Let the filters created by `DeclareHandlingByNiceBasis` imply `IsFreeLeftModule`. This was the case before the changes from gap-system#3006, and this change fixes the problem described in gap-system#5322, as I had sketched in the discussion of gap-system#5325. - Document this change (following gap-system#5325). - Increase the rank of `IsHandledByNiceBasis` by 2. Then we get back to the rank before the changes from gap-system#3006. This way, the `\in` method with second argument in `IsFreeLeftModule and IsHandledByNiceBasis` is again ranked higher than the one with second argument `IsFreeLeftModule and IsFiniteDimensional`. The bug described in issue gap-system#5334 which has been found because of the reordering of these two methods (due to gap-system#3006) gets fixed via pull request gap-system#5335, now we can return to the better method ordering. (I do not like uprankings, but I have no better idea to solve this problem.)
fingolfin
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CoefficientsCoefficients(B,v) returned a list instead of fail although the vector v did not lie in the underlying vector space V of B
fingolfin
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release notes: use title
fingolfin
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Jan 19, 2023
fingolfin
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Jan 19, 2023
- Let the filters created by `DeclareHandlingByNiceBasis` imply `IsFreeLeftModule`. This was the case before the changes from #3006, and this change fixes the problem described in #5322, as I had sketched in the discussion of #5325. - Document this change (following #5325). - Increase the rank of `IsHandledByNiceBasis` by 2. Then we get back to the rank before the changes from #3006. This way, the `\in` method with second argument in `IsFreeLeftModule and IsHandledByNiceBasis` is again ranked higher than the one with second argument `IsFreeLeftModule and IsFiniteDimensional`. The bug described in issue #5334 which has been found because of the reordering of these two methods (due to #3006) gets fixed via pull request #5335, now we can return to the better method ordering. (I do not like uprankings, but I have no better idea to solve this problem.)
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resolves #5334
Text for release notes
Up to now it could happen that
Coefficients( B, v )returned a list instead offailalthough the vectorvdid not lie in the underlying vector spaceVofB.In these cases,
Vwas a Gaussian row space and the returned list described the coefficients w.r.t. an extension field. In particular, the entries of this list were not contained inLeftActingDomain( V ).