Enoch Beery Seitz (24 August 1846 in Fairfield County, Ohio – 8 October 1883 in Adair, Missouri) was an American mathematician who was Chair of Mathematics at North Missouri State Normal School). 
Seitz was elected to the London Mathematical Society on 11 March 1880, only the fifth American to be so honored. Over 500 of his solutions were published in the "Analyst", the "Mathematical Visitor", the "Mathematical Magazine", the "School Visitor" and the "Educational Times" of London, England.
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