Comment (by Theo Anton):

Hi - I’m planning to use FLRWSolver in my research (I’m a PhD student at Queen Mary University of London working on testing GR/modified gravity in cosmology), so having FLRWSolver included in the ET would be really useful to me

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2549/inlcude-flrwsolver-in-et