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| Mirrors > Home > NFE Home > Th. List > anbi1i | Unicode version | ||
| Description: Introduce a right conjunct to both sides of a logical equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 16-Nov-2013.) | 
| Ref | Expression | 
|---|---|
| bi.aa | 
 | 
| Ref | Expression | 
|---|---|
| anbi1i | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | bi.aa | 
. . 3
 | |
| 2 | 1 | a1i 10 | 
. 2
 | 
| 3 | 2 | pm5.32ri 619 | 
1
 | 
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