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extendByZeroCLM

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 114noncomputable def extendByZeroCLM (N : ℕ) : GalerkinState N →L[ℝ] FourierState2D :=

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Definition body.

 115  LinearMap.toContinuousLinearMap (extendByZeroLinear N)
 116
 117/-!
 118## Divergence-free structure (Fourier side) and limit stability
 119
 120A structural property we can pass to the limit using only modewise convergence is a closed,
 121linear constraint such as “divergence-free in Fourier variables”:
 122
 123`k₁ * û₁(t,k) + k₂ * û₂(t,k) = 0` for every mode `k`.
 124-/
 125
 126/-- Real Fourier-side divergence constraint for a single mode. -/

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