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abbrev definition def or abbrev

FourierState2D

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formal statement (Lean)

  37abbrev FourierState2D : Type := Mode2 → VelCoeff

proof body

Definition body.

  38
  39/-!
  40## Embedding: GalerkinState N → FourierState2D
  41
  42We extend a truncated state by zero outside the truncation window.
  43-/
  44
  45/-- Read a single component coefficient at mode `k` (zero if `k ∉ modes N`). -/

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