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theorem proved tactic proof

reverse_subtracts

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formal statement (Lean)

  60theorem reverse_subtracts (phase : ℝ) :
  61    let forward_phase := phase

proof body

Tactic-mode proof.

  62    let reverse_phase := -phase
  63    forward_phase + reverse_phase = 0 := by
  64  simp only
  65  ring
  66
  67/-- Z-complexity uses absolute values, so reversal adds to Z, not subtracts. -/

depends on (4)

Lean names referenced from this declaration's body.