The principle was stated as a theorem of propositional logic by Russell and Whitehead in Principia Mathematica as:
The principle was stated as a theorem of propositional logic by Russell and Whitehead in Principia Mathematica as:
The principle was stated as a theorem of propositional logic by Russell and Whitehead in Principia Mathematica as:
The principle was stated as a theorem of propositional logic by Russell and Whitehead in Principia Mathematica as:
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