0032bf9 | ManifoldSubset.intersection: Go through ManifoldSubsetFiniteFamily to make the order of operations canonical
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282010b | ManifoldSubset._union_subset: Factor out from ManifoldSubset.union
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6772570 | ManifoldSubset.union: Handle arbitrary unions
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edfea33 | ManifoldSubset.union: Add example and plots
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fdd0aba | ManifoldSubset.declare_union: Handle arbitrary unions
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c2f484c | src/sage/manifolds/subset.py: import itertools
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a083569 | ManifoldSubset._intersection_subset, _union_subset: Use declare_subset, declare_superset; fix doctest
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5d41b46 | Merge #31764
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aceb0e8 | ManifoldSubset._union_subset: Do cache store the union here
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743f114 | ManifoldSubset._union_subset: Update open covers
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