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5 unusual facts about Augustus de Morgan


David Eugene Smith

He edited Augustus De Morgan's A Budget of Paradoxes (1915) and wrote many books on Mathematics which are listed below.

De Morgan Medal

The Society's most prestigious award, it is given in memory of Augustus De Morgan, who was the first President of the society.

Ex-tangential quadrilateral

The implication to the right is named after L. M. Urquhart (1902–1966) although it was proved long before by Augustus De Morgan in 1841.

Henry Billingsley

Augustus De Morgan has suggested that the translation was solely the work of Dee, but in his correspondence Dee states specifically that only the introduction and the supplementary material were his.

Hyperbolic sector

The analogy between circular and hyperbolic functions was described by Augustus De Morgan in his Trigonometry and Double Algebra (1849).


Frederick Guthrie

His academic career started at University College, London, where he studied for three years, he was devoted to the studying chemistry, under Thomas Graham and Alexander William Williamson, and also studied mathematics under Augustus De Morgan.

Graph coloring

Guthrie’s brother passed on the question to his mathematics teacher Augustus de Morgan at University College, who mentioned it in a letter to William Hamilton in 1852.

Penny Cyclopaedia

The unnamed contributors to the Penny Cyclopædia included many notable figures of the period, including Henry Ellis, John Kitto, Charles Knight, George Henry Lewes, Augustus De Morgan, James Paget, George Richardson Porter, Thomas Southwood Smith, and Ralph Nicholson Wornum.


see also

Catherine Barton

Augustus De Morgan, Sophia Elizabeth De Morgan, Arthur Cowper Ranyard.