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Good afternoon @Nicholaswogan.
As discussed, here is a PR for the addition of the RK45 explicit solver. I still have a few things to add like the comparison to Scipy and the performance tests, but you can already have a look.
Note that I only implemented Fehlberg RK45 here, but I wrote it in a sufficient general manner to implement any explicit RK described by its Butcher tableau.
To-Do list
atol = 1e-30
): the timesteps get infinitesimally smaller and the solver never finishes.