[Merged by Bors] - feat: port AlgebraicTopology.SimplexCategory #3286
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Mathbin -> Mathlib fix certain import statements move "by" to end of line add import to Mathlib.lean
Mathbin -> Mathlib fix certain import statements move "by" to end of line add import to Mathlib.lean
Mathbin -> Mathlib fix certain import statements move "by" to end of line add import to Mathlib.lean
…o port/Order.Category.Lat
… port/Order.Category.PartOrd
…o port/Order.Category.Lat
…o port/Order.Category.Lat
Mathbin -> Mathlib fix certain import statements move "by" to end of line add import to Mathlib.lean
…rt/Order.Category.LinOrd
Mathbin -> Mathlib fix certain import statements move "by" to end of line add import to Mathlib.lean
… port/Order.Category.NonemptyFinLinOrd
Mathbin -> Mathlib fix certain import statements move "by" to end of line add import to Mathlib.lean
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…inOrd' into port/AlgebraicTopology.SimplexCategory
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Introducing two lemmas
Fin.ite_valandFin.dite_val, the simplicial relations are now obtained in a slightly cleaner way as compared to mathlib. Everything is translated into equalities of natural numbers on a case by case basis usingsplit_ifs,simpandlinarith.