System EN

[Chellas, 1980] (See the listing in his index)

Notes

Based on

System EN is System E + Axiom N: L(true)

Or in other words:

[Chellas, 1980, p237]

Basis for

System EMN is EN + Axiom M [L(p&q)>(Lp&Lq)] [Chellas, 1980, p237]

System ECN is EN + Axiom C[ (Lp&Lq) > L(p&q)] [Chellas, 1980, p237]


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