Rayleigh-Ritz method

Also called Ritz projection.

Projects an eigenproblem onto a subspace and solves the small projected problem.

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The build computes these levels from the evidence in the repository. Each row says what the next level needs. Read what the levels mean.

Ladder	Level	What the next level needs
Human proof	H0 no proof	add a proof in proofs/ (06.5)
Lean	L0 no Lean part	name a Lean module in the lean field (07)
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Writing	W0 stub	one source with a locator