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theorem proved term proof

mass_rung_step

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formal statement (Lean)

 288theorem mass_rung_step (ys : ℝ) (n : ℤ) :
 289    mass_rung ys (n + 1) = phi * mass_rung ys n := by

proof body

Term-mode proof.

 290  unfold mass_rung
 291  push_cast
 292  rw [Real.rpow_add (by exact phi_pos), Real.rpow_one]
 293  ring
 294
 295/-- **THEOREM**: Mass is positive for positive yardstick. -/

used by (2)

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depends on (9)

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