feat: PProd and MProd syntax (part 1) #4747
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the internal constructions for structural and well-founded recursion use plenty of `PProd` and `MProd`, and reading these, deeply nested and in prefix notation, is unnecessarily troublesome. Therefore this introduces notations ``` a ×ₚ b -- PProd a b a ×ₘ b -- MProd a b ()ₚ -- PUnit.unit (x,y,z)ₚ -- PProd.mk x (PProd.mk y z) (x,y,z)ₘ -- MProd.mk x (MProd.mk y z) ``` (This is part 1, the rest will follow after a stage0 update)
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the internal constructions for structural and well-founded recursion
use plenty of
PProdandMProd, and reading these, deeplynested and in prefix notation, is unnecessarily troublesome.
Therefore this introduces notations
(This is part 1, the rest will follow in #4730 after a stage0 update.)