Description: A kind of Aristotelian inference. This judgement replaces the mode of inference barbara when the minor premise has a particular context. Proposition 62 of Frege1879 p. 52. (Contributed by RP, 24-Dec-2019) (Proof modification is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | frege59c.a | ||
Assertion | frege62c |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | frege59c.a | ||
2 | 1 | frege58c | |
3 | sbcim1 | ||
4 | 2 3 | syl | |
5 | ax-frege8 | ||
6 | 4 5 | ax-mp |