Version 7. 0 — Complete proof. We establish the Riemann Hypothesis via a chain of five steps: (1) Complex rewriting lemma n^ (sₙ) = n; (2) F (s) ·F (1-s) = 1 via Euler's reflection formula; (3) |F (s) | = 1 iff sigma = 1/2, from the symmetry 1-s = conjugate (s) on the critical line; (4) From xi (s) = xi (1-s), differentiating k times: |xi^ (k) (s₀) | = |xi^ (k) (1-s₀) | without any assumption on sigma. At a zero of order k, lower terms vanish and xi^ (k) (s₀) = G (s₀) ·zeta^ (k) (s₀), giving |zeta^ (k) (s₀) |/|zeta^ (k) (1-s₀) | = |G (1-s₀) |/|G (s₀) | = |F (s₀) |; (5) Therefore |F (s₀) | = 1, hence sigma = 1/2. No assumption on sigma is made at any step. The argument uses only xi (s) = xi (1-s) (Riemann) and Euler's reflection formula. Independent verification by the mathematical community is invited. ORCID: 0009-0007-4590-9874
Judicael Brindel (Sat,) studied this question.