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Mirrors > Home > MPE Home > Th. List > lukshefax1  Unicode version 
Description: This alternative axiom
for propositional calculus using the Sheffer Stroke
was offered by Lukasiewicz in his Selected Works. It improves on Nicod's
axiom by reducing its number of variables by one.
This axiom also uses nicmp 1442 for its constructions. Here, the axiom is proved as a substitution instance of nicax 1444. (Contributed by Anthony Hart, 31Jul2011.) (Proof modification is discouraged.) (New usage is discouraged.) 
Ref  Expression 

lukshefax1 
Step  Hyp  Ref  Expression 

1  nicax 1444  1 
Colors of variables: wff set class 
Syntax hints: wnan 1293 
This theorem is referenced by: lukshefth1 1466 lukshefth2 1467 renicax 1468 
This theorem was proved from axioms: ax1 5 ax2 6 ax3 7 axmp 8 
This theorem depends on definitions: dfbi 178 dfan 361 dfnan 1294 
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