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A: What are examples of mathematical concepts named after the wrong people? (Stigler's law)

Mark BennetAccording to this link Steiner Systems were mentioned by by W Woolhouse in 1844 before the famous Kirkman Schoolgirl problem (P Kirkman 1847) - Steiner's work was more systematic and did advance the theory, but it came in 1853.

The link to eom.springer.de is broken, but the article can now be found at encyclopediaofmath.org/wiki/Steiner_system. — The Amplitwist Jul 25 at 18:48
Since the question was bumped recently, I have edited link in this answer. I guess the link can now be removed. (I have already flagged it.)
 

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