Abstract
The aim of this comment is to show that discovery of hyperchaos in three systems investigated in Li et al. (Nonlinear Dyn 94(3):1703–1720, 2018) is not correct. It is justified both theoretically and numerically. Corrected calculations of Lyapunov exponents and corresponding bifurcation diagram are given. Examples of hyperchaotic Hamiltonian multiple pendulum systems are presented.
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