group[centralizer] - find the centralizer of a set of permutations
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Calling Sequence
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centralizer(pg, s)
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Parameters
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pg
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group in which the centralizer is to be found
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s
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set of permutations or a single permutation
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Description
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This function finds the largest subgroup of the permutation group pg in which every element commutes with every element of s. s need not be contained in pg. The result is returned as an unevaluated permgroup call.
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The command with(group,centralizer) allows the use of the abbreviated form of this command.
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