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Pi-clan polynomials #148

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@Jlh18

Refactor results from Poly in this file

The important sorrys remaining are

  1. I have defined the Beck-Chevalley natural transformations, but not shown that they are isomorphisms. Links MorphismProperty.Over.map /left adjoint to pb/sigma and pushward/right adjoint to pb/pi
  2. MorphismProperty.Over.map /left adjoint to pb/sigma preserves pullbacks. Here

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D-highDifficulty: highI-critImpact: criticalO-polyOther: improvements to Poly

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