Description: Combination of applying a definition and applying it to a specific instance. Proposition 68 of Frege1879 p. 54. (Contributed by RP, 24-Dec-2019) (Proof modification is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | frege59c.a | ||
Assertion | frege68c |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | frege59c.a | ||
2 | frege57aid | ||
3 | 1 | frege67c | |
4 | 2 3 | ax-mp |