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| Mirrors > Home > ILE Home > Th. List > com23 | Unicode version | ||
| Description: Commutation of antecedents. Swap 2nd and 3rd. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 4-Aug-2012.) | 
| Ref | Expression | 
|---|---|
| com3.1 | 
 | 
| Ref | Expression | 
|---|---|
| com23 | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | com3.1 | 
. 2
 | |
| 2 | pm2.27 40 | 
. 2
 | |
| 3 | 1, 2 | syl9 72 | 
1
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