Proof of `The arithmetic obstruction to a linear subspace class being a multiple of the hyperplane power`

groundedproofs/Lax894236Proofs/LinearSubspaceClass.lean · lax-894236

What this proof establishes

no assumptions

Assuming the claims on the left, the claim on the right holds — checked by the archive's pipeline. Proof code is not displayed here.

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Description

From cd=1c d = 1, c=1/dc = 1/d; then c2d=1/dc² d = 1/d, and nd=1n d = 1 in Z forces d1d ∣ 1, impossible for d2d ≥ 2.