Augustus De Morgan
The life of Augustus De Morgan - Mathematical Logic and Pure Principle
Famous Logic
1. De Morgan's Laws
Fundamental rules of logic and set theory relating conjunctions and disjunctions.
$$ \neg(A \land B) \iff (\neg A) \lor (\neg B) $$ $$ \neg(A \lor B) \iff (\neg A) \land (\neg B) $$Sources: https://mathshistory.st-andrews.ac.uk/Biographies/De_Morgan/
