161
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CP
2005
Springer
16 years 8 days ago
2005
Springer
Conditional symmetry arises in a sub-problem of a constraint satisfaction problem, where the sub-problem satisfies some condition under which additional symetries hold. Typically...
152
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CP
2007
Springer
16 years 28 days ago
2007
Springer
We introduce groupoids – generalisations of groups in which not all pairs of elements may be multiplied, or, equivalently, categories in which all morphisms are invertible – as...