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Metamath Proof Explorer
Theorem 1xr
Description: 1 is an extended real number. (Contributed by Glauco Siliprandi, 2-Jan-2022)
|
|
Ref |
Expression |
|
Assertion |
1xr |
⊢ 1 ∈ ℝ* |
Proof
| Step |
Hyp |
Ref |
Expression |
| 1 |
|
1re |
⊢ 1 ∈ ℝ |
| 2 |
1
|
rexri |
⊢ 1 ∈ ℝ* |