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Description: The intersection of the universal class is empty. (Contributed by NM, 11-Sep-2008)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | intv |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0ex | ||
| 2 | int0el | ||
| 3 | 1 2 | ax-mp |