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Mirrors > Home > MPE Home > Th. List > df-undef | Structured version Visualization version Unicode version |
Description: Define the undefined value function, whose value at set is guaranteed not to be a member of (see pwuninel 7401). (Contributed by NM, 15-Sep-2011.) |
Ref | Expression |
---|---|
df-undef |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cund 7398 | . 2 | |
2 | vs | . . 3 | |
3 | cvv 3200 | . . 3 | |
4 | 2 | cv 1482 | . . . . 5 |
5 | 4 | cuni 4436 | . . . 4 |
6 | 5 | cpw 4158 | . . 3 |
7 | 2, 3, 6 | cmpt 4729 | . 2 |
8 | 1, 7 | wceq 1483 | 1 |
Colors of variables: wff setvar class |
This definition is referenced by: undefval 7402 |
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