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Mirrors > Home > MPE Home > Th. List > eldif | Structured version Visualization version Unicode version |
Description: Expansion of membership in a class difference. (Contributed by NM, 29-Apr-1994.) |
Ref | Expression |
---|---|
eldif |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex 3212 | . 2 | |
2 | elex 3212 | . . 3 | |
3 | 2 | adantr 481 | . 2 |
4 | eleq1 2689 | . . . 4 | |
5 | eleq1 2689 | . . . . 5 | |
6 | 5 | notbid 308 | . . . 4 |
7 | 4, 6 | anbi12d 747 | . . 3 |
8 | df-dif 3577 | . . 3 | |
9 | 7, 8 | elab2g 3353 | . 2 |
10 | 1, 3, 9 | pm5.21nii 368 | 1 |
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