Description: Membership in an image. Theorem 34 of Suppes p. 65. (Contributed by NM, 20-Jan-2007)
Ref | Expression | ||
---|---|---|---|
Assertion | elimag | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | breq2 | |
|
2 | 1 | rexbidv | |
3 | dfima2 | |
|
4 | 2 3 | elab2g | |