Named for (Hungarian-born) American mathematician Paul Halmos (born 1916) who first used it in mathematics, after seeing it marking the end of articles in magazines.
"halmos." YourDictionary, n.d. Web. 23 June 2018. <http://www.yourdictionary.com/halmos>.
halmos. (n.d.). Retrieved June 23rd, 2018, from http://www.yourdictionary.com/halmos
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