New preprint by Shu and Wang explains "H-dualities" in stepsize-reversed algorithms
prof_grimmer · x · 2026-09-06
Math professor profgrimmer spotlights a recent preprint by Kevin Shu and Alex L. Wang giving an explanation of so-called "H-dualities" — relationships between algorithms where reversing the order of stepsizes yields new meaningful methods. He calls these relationships "magical."
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