Description: A kind of Aristotelian inference. This judgement replaces the mode of inference barbara when the minor premise has a general context. Proposition 65 of Frege1879 p. 53. (Contributed by RP, 17-Apr-2020) (Proof modification is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | frege65a |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ifpimim | ||
2 | frege64a | ||
3 | 1 2 | syl | |
4 | frege61a | ||
5 | 3 4 | ax-mp |