pm4.66dc - Intuitionistic Logic Explorer

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Theorem pm4.66dc 835

Description: Theorem *4.66 of [WhiteheadRussell] p. 120, given a decidability condition. (Contributed by Jim Kingdon, 2-May-2018.)

**Assertion**
Ref	Expression
pm4.66dc	DECID $\/$

**Proof of Theorem pm4.66dc**
Step	Hyp	Ref	Expression
1		pm4.64dc 834	1 DECID $\/$

Colors of variables: wff set class

Syntax hints:

wn 3

wi 4

wb 103 $\/$ wo 661 DECID wdc 775

This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662

This theorem depends on definitions: df-bi 115 df-dc 776

This theorem is referenced by: pm4.54dc 838