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| Mirrors > Home > MPE Home > Th. List > ressxr | Structured version Visualization version Unicode version | ||
| Description: The standard reals are a subset of the extended reals. (Contributed by NM, 14-Oct-2005.) |
| Ref | Expression |
|---|---|
| ressxr |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssun1 3776 |
. 2
| |
| 2 | df-xr 10078 |
. 2
| |
| 3 | 1, 2 | sseqtr4i 3638 |
1
|
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