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theorem proved term proof

euler_phi_connection

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formal statement (Lean)

 215theorem euler_phi_connection :
 216    -- cos(π/5) = φ/2 (the real part of e^(iπ/5))
 217    Real.cos (Real.pi / 5) = phi / 2 := by

proof body

Term-mode proof.

 218  rw [Real.cos_pi_div_five]
 219  -- phi / 2 = (1 + sqrt 5) / 2 / 2 = (1 + sqrt 5) / 4
 220  unfold phi
 221  ring
 222
 223/-! ## RS Interpretation -/
 224
 225/-- RS interpretation of e:
 226
 227    1. **J-cost decay**: Probabilities involve e^(-J)
 228    2. **Continuous time**: e^(iωt) for oscillations
 229    3. **Growth rate**: Maximum sustainable rate is e
 230    4. **8-tick phases**: exp(2πik/8) uses e
 231
 232    e is the natural base for ledger dynamics. -/

depends on (14)

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