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Jun 8, 2018 at 10:31 comment added CAF Very late reply but is there a way to generalise this answer to allow products in the numerators? E.g n2/n3/n4/n5 + n1*n2/n3/n4/n5 /. PatternSort@{ n2/n3/n4/n5 -> a2, n1*n2/n3/n4/n5 -> e} will work but n2/n3/n4/n5 + n1*n2/n3/n4/n5 /. PatternSort@{n1*n2/n3/n4/n5 -> e,n2/n3/n4/n5 -> a2} will not
Sep 11, 2017 at 13:28 history answered Lukas Lang CC BY-SA 3.0