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| Mirrors > Home > ILE Home > Th. List > ax-ie1 | Unicode version | ||
Description:  is bound in   . One of the axioms of predicate logic.
(Contributed by Mario Carneiro, 31-Jan-2015.) |
| Ref | Expression |
|---|---|
| ax-ie1 |
     |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wph |
. . 3
 | |
| 2 | vx |
. . 3
 | |
| 3 | 1, 2 | wex 1381 |
. 2
|
| 4 | 3, 2 | wal 1241 |
. 2
|
| 5 | 3, 4 | wi 4 |
1
|
| Colors of variables: wff set class |
| This axiom is referenced by: hbe1 1384 sbidm 1731 |
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