minimalBetti fails for zero modules
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package issue
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- Macaulay2
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Description
With Complexes:
i1 : S = ZZ/2[x]; minimalBetti coker map(S^0, S^0, 0)
stdio:1:25:(3): error: key not found in hash table:
ResolutionObject (of class Symbol)
But at least this failed with OldChainComplexes, too:
i1 : S = ZZ/2[x]; minimalBetti coker map(S^0, S^0, 0)
Internal error: (-1,1) out of range
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Research direction
Reproduce the minimalBetti commands shown for Complexes and OldChainComplexes, focusing on the zero-module case. Trace the implementation reached by minimalBetti and compare both failures; done means the zero-module input is handled without a hash-table or range error.
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Assessment
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- backend
- Issue type
- Bug
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- 3-5 days
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