In 1795 John Playfair published a different formulation of Euclid's parallel postulate, which is now called Playfair's axiom; though the axiom bears Playfair's name, he did not create it, but credited others, in particular William Ludlam, with the prior use of it.
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Playfair gained notoriety late in the season after video of his wild tantrum against referee Jamie Koharski that involved the coach smashing two sticks went viral.
As was typical of publishers of his era, he published religious and homiletic works, like The Pathway to Perfection and The Mean of Mourning (both 1596) by Thomas Playfair — though he appears to have operated a rather small-scale business, in comparison with other stationers of his generation.
Playfair married the actress Lena Ashwell OBE in 1896; he began divorce proceedings in 1903 following her adultery with Robert Taber, the former husband of actress Julia Marlowe.
In 1919 he produced the designs for Nigel Playfair's (1874–1934) ground-breaking production of As You Like It in Stratford upon Avon, then in 1920 for Playfair's highly successful London revival of John Gay's The Beggar's Opera.
Among Martin's most notable work are the proofs of analytic determinacy (from the existence of a measurable cardinal), Borel determinacy (from ZFC alone), the proof (with John R. Steel) of projective determinacy (from suitable large cardinal axioms), and his work on Martin's axiom.
Bowley was nominated by David Landale and seconded by Henry Pollock, Fitzwilliams by Henry Pollock and H. W. Looker and Goldring by E. J. Grist and H. S. Playfair.
Coming from New South Wales, Playfair combined with Janet Steinbeck, Lyn McClements and Lynne Watson to register a silver medal in the 4x100m medley relay, trailing the Americans home by 1.7s.
Mount Pluto, Australia, a volcanic cone associated with Mount Hutton and Mount Playfair, in Northern Territory
Bandon married Maybel Elizabeth Playfair, the daughter of Raymond Playfair, on 28 February 1933 at Nairobi Cathedral, in Kenya.
Advanced thematic cryptic crosswords like The Listener Crossword (published in the Saturday edition of The Times (UK) newspaper) occasionally incorporate Playfair ciphers.
Ian Spence and Howard Wainer in 2001 describe Playfair as "engineer, political economist and scoundrel" while "Eminent Scotsmen" calls him an "ingenious mechanic and miscellaneous writer."
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Two decades before Playfair's first achievements, in 1765 Joseph Priestley had created the innovation of the first timeline charts, in which individual bars were used to visualize the life span of a person, and the whole can be used to compare the life spans of multiple persons.