The Riemann, generalized Riemann, and Extended Riemann hypotheses use non-conceptually different expressions in which functional equations contain f (s) ↔ f (1 − s) symmetry. Hence, symmetry explains all three of Riemann’s hypotheses (2) (PDF) SIMPLE SYMMETRY PROVES ALL THREE RIEMANN'S HYPOTHESES. Available from: https://www.researchgate.net/publication/381697682_SIMPLE_SYMMETRY_PROVES_ALL_THREE_RIEMANN'S_HYPOTHESES