bj-nndcALT - Mathbox for BJ

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Theorem bj-nndcALT 13639

Description: Alternate proof of nndc 841. (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 619	. . 3
2		bj-nnor 13615	. . 3 $\/$
3	1, 2	mpbir 145	. 2 $\/$
4		df-dc 825	. . 3 DECID $\/$
5	4	notbii 658	. 2 DECID $\/$
6	3, 5	mtbir 661	1 DECID

Colors of variables: wff set class

Syntax hints:

wn 3

wi 4 $\/$ wo 698 DECID wdc 824

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699

This theorem depends on definitions: df-bi 116 df-dc 825

This theorem is referenced by: (None)