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Description: A member of an upper set of integers is a real. (Contributed by Mario Carneiro, 31-Aug-2013)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | eluzelre |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eluzelz | ||
| 2 | 1 | zred |