Lax Lean Archive

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Proof of `Gelfand numbers, Bernstein numbers and the compactness seminorm` (2nd statement)

groundedproofs/Lax606786Proofs/Appendix.lean · lax-606786

What this proof establishes

thm✓Lax606786.GelfandBernsteinComparison (2nd statement)

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

Read the Lean proof on GitLab

Description

A projection with prescribed kernel and controlled norm makes TT close to a finite-rank operator.