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 | ||
---|---|---|---|
Assertion | frege68b |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | frege57aid | ||
2 | frege67b | ||
3 | 1 2 | ax-mp |