De Morgan's laws concisely relate the AND and OR logical operators to each other in terms of each other's negation.

Sophia Elizabeth De Morgan has written:

'Memoir of Augustus De Morgan' -- subject(s): Correspondence, Mathematicians, Biography

'Algy's lesson'

Mary De Morgan has written:

'The necklace of Princess Fiorimonde' -- subject(s): Conduct of life, Juvenile literature

De Witt Schuyler Morgan has written:

'Living and working together' -- subject(s): Citizenship, Political science, Social sciences

Jacques de Morgan was born in 1857.