theorem cycleProduct_real_pos {N : ℕ} {k : Fin N → ℝ} (hk : ∀ n, 0 < k n) : 0 < cycleProduct_real N k := Finset.prod_pos fun n _ => hk n
thesis/CESProofs/Dynamics/EntryExitDynamics.lean:134
## Entry-Exit Core Definitions (merged from EntryExitDefs.lean)