De Morgan, Augustus, an eminent mathematician, born in Madura, S. India; was professor of Mathematics in London University from 1828 till his death, though he resigned the appointment for a time in consequence of the rejection of a candidate, James Martineau, for the chair of logic, on account of his religious opinions; wrote treatises on almost every department of mathematics, on arithmetic, algebra, trigonometry, differential and integral calculus, the last pronounced to be “the most complete treatise on the subject ever produced in England”; wrote also “Formal Logic” (1806‒1871).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Demon * Demosthenes