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Mirrors > Home > MPE Home > Th. List > ne0i | Structured version Visualization version GIF version |
Description: If a class has elements, then it is nonempty. (Contributed by NM, 31-Dec-1993.) |
Ref | Expression |
---|---|
ne0i | ⊢ (𝐵 ∈ 𝐴 → 𝐴 ≠ ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | n0i 4268 | . 2 ⊢ (𝐵 ∈ 𝐴 → ¬ 𝐴 = ∅) | |
2 | 1 | neqned 2951 | 1 ⊢ (𝐵 ∈ 𝐴 → 𝐴 ≠ ∅) |
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