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Aug 2, 2018 at 1:40 comment added Timothy Chow That question seems close enough for this to be a duplicate. I'm voting to close the question.
Aug 1, 2018 at 17:49 comment added Sophie Swett According to the question at mathoverflow.net/questions/280261/…, Jordan (I assume Camille Jordan) wrote about homomorphisms in 1870 (but called them "isomorphisms"), so the concept is at least 65 years older than the OED citation.
Aug 1, 2018 at 17:45 comment added Piotr Achinger That’s a rather crude upper bound!
Aug 1, 2018 at 17:43 history answered Gerald Edgar CC BY-SA 4.0