def
definition
def or abbrev
decompose_perturbation
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20def decompose_perturbation (h : Fin 3 → Fin 3 → ℝ) : Prop :=
proof body
Definition body.
21 ∃ (tp : TensorPerturbation) (scalar : ℝ) (vector : Fin 3 → ℝ),
22 h = (fun i j => tp.h_TT 0 i j + (if i = j then scalar else 0) + (vector i + vector j))
23
24/-- Existence of a TT projection operator. -/