178 B
		
	
	
	
	
	
	
	
			
		
		
	
	
			178 B
		
	
	
	
	
	
	
	
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Law of Non-Contradiction
A proposition cannot be true and false at the same time.
\lnot (P \land  \lnot P)
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A proposition cannot be true and false at the same time.
\lnot (P \land  \lnot P)