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Mirrors > Home > NFE Home > Th. List > orcs | Unicode version |
Description: Deduction eliminating disjunct. 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 15) -type inference in a proof. (Contributed by NM, 21-Jun-1994.) |
Ref | Expression |
---|---|
orcs.1 |
Ref | Expression |
---|---|
orcs |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orc 374 | . 2 | |
2 | orcs.1 | . 2 | |
3 | 1, 2 | syl 15 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wo 357 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 177 df-or 359 |
This theorem is referenced by: olcs 384 ifor 3702 |
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