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| Mirrors > Home > MPE Home > Th. List > df-nel | Structured version Visualization version Unicode version | ||
| Description: Define negated membership. (Contributed by NM, 7-Aug-1994.) |
| Ref | Expression |
|---|---|
| df-nel |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cA |
. . 3
| |
| 2 | cB |
. . 3
| |
| 3 | 1, 2 | wnel 2897 |
. 2
|
| 4 | 1, 2 | wcel 1990 |
. . 3
|
| 5 | 4 | wn 3 |
. 2
|
| 6 | 3, 5 | wb 196 |
1
|
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