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Theorem ninba 956

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 951	. 2 $/\$
3	2	bicomd 140	1 $/\$

Colors of variables: wff set class

Syntax hints:

wn 3

wi 4 $/\$ wa 103

wb 104

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 603 ax-in2 604

This theorem depends on definitions: df-bi 116

This theorem is referenced by: (None)