InvariantBasisNumber.eq_of_fin_equiv

∀ {R : Type u} {inst : Semiring R} [self : InvariantBasisNumber R] {n m : ℕ} (a : (Fin n → R) ≃ₗ[R] Fin m → R), n = m

Any linear equiv between Rⁿ and Rᵐ guarantees m = n.

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