feat: Add enumeration between list indicies and element-multiplicity pairs. #1507
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I am going to start looking at this again now that the dependent PRs have merged. |
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This PR adds functions which define an equivalence between the indices of a list and pairs of elements with multiplicities. We use the same functions to define maps between
Fin (xs.length)andFin (ys.length)which, whichxsis a subperm ofys, are precisely the appropriate embedding. These are intended to have some practical use by linking list subperms and perms to injective/bijective maps between indices.Depends on #1506, #1500.