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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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