The Lean 4 theorem `nsFlow_group` in the `ChapterNavierStokesFlow` chapter of the timepiece formalization

-- Generated from ChapterNavierStokesFlow.lean — theorem BookProof.NavierStokesFlow.nsFlow_group
import Mathlib
import Definitions.Def_ChapterNavierStokesFlow
open BookProof.NavierStokesFlow


open scoped BigOperators Matrix Kronecker ComplexOrder TensorProduct

variable {n : ℕ} (d : NSTruncation n)

theorem BookProof.NavierStokesFlow.nsFlow_group (s t : ℝ) :
    nsFlowUnitary d (s + t) = nsFlowUnitary d s * nsFlowUnitary d t := by sorry