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| Description: Inference commuting conjunction in antecedent. Notational convention: We sometimes suffix with "s" the label of an inference that manipulates an antecedent, leaving the consequent unchanged. The "s" means that the inference eliminates the need for a syllogism (syl 10) -type inference in a proof. |
| Ref | Expression |
|---|---|
| ancoms.1 |
|
| Ref | Expression |
|---|---|
| ancoms |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ancom 435 |
. 2
| |
| 2 | ancoms.1 |
. 2
| |
| 3 | 1, 2 | sylbi 199 |
1
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