`BookProof.ChapterA4f.boostZ_preserves_angle` {l : ℂ} (hl : l ≠ 0) (T : Matrix (Fin 2) (Fin 2) ℂ) : (boostZ l * T * boostZ l⁻¹) 0 0 = T 0 0

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`BookProof.ChapterA4f.boostZ_preserves_angle` {l : ℂ} (hl : l ≠ 0) (T : Matrix (Fin 2) (Fin 2) ℂ) : (boostZ l * T * boostZ l⁻¹) 0 0 = T 0 0 · Prove2Me