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def definition def or abbrev

minkowskiMatrix

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formal statement (Lean)

  23noncomputable def minkowskiMatrix : Matrix (Fin 4) (Fin 4) ℝ :=

proof body

Definition body.

  24  Matrix.diagonal fun i => if i.val = 0 then -1 else 1
  25
  26/-- Bridge is accepted if the matrix is invertible (non-zero determinant). -/

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