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Theorem ninba 879

Description: Miscellaneous inference relating falsehoods. (Contributed by NM, 31-Mar-1994.)

**Hypothesis**
Ref	Expression
ninba.1

**Assertion**
Ref	Expression
ninba	$/\$

**Proof of Theorem ninba**
Step	Hyp	Ref	Expression
1		ninba.1	. . 3
2	1	niabn 874	. 2 $/\$
3	2	bicomd 129	1 $/\$

Colors of variables: wff set class

Syntax hints:

wn 3

wi 4 $/\$ wa 97

wb 98

This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-in1 544 ax-in2 545

This theorem depends on definitions: df-bi 110

This theorem is referenced by: (None)