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| Description: Define the universal class. Definition 5.20 of [TakeutiZaring] p. 21. |
| Ref | Expression |
|---|---|
| df-v |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cvv 2569 |
. 2
| |
| 2 | vx |
. . . . 5
| |
| 3 | 2 | cv 1614 |
. . . 4
|
| 4 | 3, 3 | wceq 1615 |
. . 3
|
| 5 | 4, 2 | cab 2157 |
. 2
|
| 6 | 1, 5 | wceq 1615 |
1
|
| Colors of variables: wff set class |
| This definition is referenced by: visset 2572 int0 3446 fo1st 5178 fo2nd 5179 ruv 5980 foo3 13004 domep 14740 elnev 17489 |