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| Mirrors > Home > MPE Home > Th. List > ioossre | Structured version Visualization version GIF version | ||
| Description: An open interval is a set of reals. (Contributed by NM, 31-May-2007.) |
| Ref | Expression |
|---|---|
| ioossre | ⊢ (𝐴(,)𝐵) ⊆ ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elioore 13417 | . 2 ⊢ (𝑥 ∈ (𝐴(,)𝐵) → 𝑥 ∈ ℝ) | |
| 2 | 1 | ssriv 3987 | 1 ⊢ (𝐴(,)𝐵) ⊆ ℝ |
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