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| Mirrors > Home > NFE Home > Th. List > ax-9d1 | Unicode version | ||
| Description: Distinct variable version of ax9 1949, equal variables case. (Contributed by Mario Carneiro, 14-Aug-2015.) |
| Ref | Expression |
|---|---|
| ax-9d1 |
     |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | vx |
. . . . 5
 | |
| 2 | 1, 1 | weq 1643 |
. . . 4
 |
| 3 | 2 | wn 3 |
. . 3
|
| 4 | 3, 1 | wal 1540 |
. 2
|
| 5 | 4 | wn 3 |
1
|
| Colors of variables: wff setvar class |
| This axiom is referenced by: (None) |
| Copyright terms: Public domain | W3C validator |