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Commit 2017-08-02 15:24 6392b05a

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refactor(*): switch from order_pair to partial_order

Estimated changes

modified theorem directed_of_chain
modified def filter.at_bot
modified def filter.at_top
modified theorem filter.monotone_lift'
modified theorem filter.monotone_lift
modified theorem set.monotone_inter
modified theorem set.monotone_prod
modified theorem set.monotone_set_of