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| Mirrors > Home > MPE Home > Th. List > nfel | Structured version Visualization version Unicode version | ||
| Description: Hypothesis builder for elementhood. (Contributed by NM, 1-Aug-1993.) (Revised by Mario Carneiro, 11-Aug-2016.) (Proof shortened by Wolf Lammen, 16-Nov-2019.) |
| Ref | Expression |
|---|---|
| nfnfc.1 |
|
| nfeq.2 |
|
| Ref | Expression |
|---|---|
| nfel |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nfnfc.1 |
. . . 4
| |
| 2 | 1 | a1i 11 |
. . 3
|
| 3 | nfeq.2 |
. . . 4
| |
| 4 | 3 | a1i 11 |
. . 3
|
| 5 | 2, 4 | nfeld 2773 |
. 2
|
| 6 | 5 | trud 1493 |
1
|
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