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Polish notation

Created by Jan Lukasiewicz[?]. Operators are placed before operands. Compare to Reverse Polish Notation.

 Np   negation ~ p  
 Kpq  conjunction p · q  
 Apq  disjunction p Ú q  
 Cpq  material implication p É q  
 Epq  material equivalence      p º q  
 PxFx universal quantifier (x)Fx  
 SxGx existential quantifier ($x)Gx

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