[Merged by Bors] - feat(linear_algebra/finite_dimensional): add dim_sup_add_dim_inf_eq #3304
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…3304) Adding a finite-dimensional version of dim(W+X)+dim(W \cap X)=dim(W)+dim(X)
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| begin | ||
| have key : dim K ↥(s ⊔ t) + dim K ↥(s ⊓ t) = dim K s + dim K t := dim_sup_add_dim_inf_eq s t, | ||
| repeat { rw ←findim_eq_dim at key }, | ||
| norm_cast at key, |
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exact_mod_cast key also works
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…eanprover-community#3304) Adding a finite-dimensional version of dim(W+X)+dim(W \cap X)=dim(W)+dim(X)
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Adding a finite-dimensional version of dim(W+X)+dim(W \cap X)=dim(W)+dim(X)