bj-nndcALT - Mathbox for BJ

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Theorem bj-nndcALT 14671

Description: Alternate proof of nndc 851. (Proof modification is discouraged.) (New usage is discouraged.) (Contributed by BJ, 9-Oct-2019.)

**Assertion**
Ref	Expression
bj-nndcALT	DECID

**Proof of Theorem bj-nndcALT**
Step	Hyp	Ref	Expression
1		notnot 629	. . 3
2		bj-nnor 14647	. . 3 $\/$
3	1, 2	mpbir 146	. 2 $\/$
4		df-dc 835	. . 3 DECID $\/$
5	4	notbii 668	. 2 DECID $\/$
6	3, 5	mtbir 671	1 DECID

Colors of variables: wff set class

Syntax hints:

wn 3

wi 4 $\/$ wo 708 DECID wdc 834

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709

This theorem depends on definitions: df-bi 117 df-dc 835

This theorem is referenced by: (None)