System ECN

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

Notes

Based on

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

System ECN is System EC + Axiom N: L(true) [Chellas, 1980, p237]

Basis for

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

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