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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 12989 | . 2 ⊢ (𝑥 ∈ (𝐴(,)𝐵) → 𝑥 ∈ ℝ) | |
2 | 1 | ssriv 3919 | 1 ⊢ (𝐴(,)𝐵) ⊆ ℝ |
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