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Ideas of Augustus De Morgan, by Text

[British, 1806 - 1871, Professor at King's College, London.]

1846 works
p.20 De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [Walicki]
1859 On the Syllogism IV
p.21 De Morgan started the study of relations and their properties [Walicki]
p.94 De Morgan found inferences involving relations, which eluded Aristotle's syllogistic [Hart,WD]