Uzunca, M.2025-03-232025-03-2320212146-1147https://hdl.handle.net/11486/7435In this paper we apply Kahan's nonstandard discretization to three dimensional Lotka-Volterra equations in bi-Hamiltonian form. The periodicity of the solutions and all polynomial and non-polynomial invariants are well preserved in long-term integration. Applying classical deferred correction method, we show that the invariants are preserved with increasing accuracy as a results of more accurate numerical solutions. Substantial speedups over the Kahan's method are achieved at each run with deferred correction method.eninfo:eu-repo/semantics/closedAccessLotka-Volterra equationsconserved quantitiesKahan's methoditerated de-ferred correctionArticle114108010922-s2.0-85119171310Q3WOS:000704458100012N/A