Across three stiff ODE benchmarks, no explicit single-step exponential integrator beats first-order integrating factor Euler, and implicit methods remain more accurate.
(16) Although this ETD4RK method is formally fourth-order, Ref
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Performance Evaluation of Single-step Explicit Exponential Integration Methods on Stiff Ordinary Differential Equations
Across three stiff ODE benchmarks, no explicit single-step exponential integrator beats first-order integrating factor Euler, and implicit methods remain more accurate.