From an academic paper,
"the existence of elliptic or hyperbolic 2-periodic orbits is an open property".
I have never seen the term "open property" used before, moreover the paper gives no suggestion as to what it is?
2026-04-03 12:33:19.1775219599
What is an open property?
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It is like holomorphic: if true on p, then true on a neighbourhood of p (unlike continuous, differentiable, twice differentiable but like real or complex-analytic i believe) ?
See here for an example:
Is twice differentiability an open property?