I was working on a white paper on ocean dynamics today and I threw in a sentence about how emulators (like machine-learning replacements for simulations) might be working because they might be effectively learning a high-order integration method. I then threw in a sentence about how, in many applications, high-order integrators are known to be better than low-order integrators. I then went to find a reference and... well, I am not sure I can back that up with a reference! I thought this was common knowledge, but it looks like almost all simulations and integrations are done with low-order integrators. Am I living in a simulation? (A simulation integrated with wimpy first-order integrators?)
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