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faster Hochschild lattices #40400

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faster Hochschild lattices #40400

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by being smarter about telling the covering relations

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before:

sage: %timeit posets.HochschildLattice(8)
158 ms ± 2.11 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)

after:

sage: %timeit posets.HochschildLattice(8)
18.3 ms ± 80.3 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

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