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Mirrors > Home > MPE Home > Th. List > sselid | Structured version Visualization version GIF version |
Description: Membership inference from subclass relationship. (Contributed by NM, 25-Jun-2014.) |
Ref | Expression |
---|---|
sseli.1 | ⊢ 𝐴 ⊆ 𝐵 |
sselid.2 | ⊢ (𝜑 → 𝐶 ∈ 𝐴) |
Ref | Expression |
---|---|
sselid | ⊢ (𝜑 → 𝐶 ∈ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sselid.2 | . 2 ⊢ (𝜑 → 𝐶 ∈ 𝐴) | |
2 | sseli.1 | . . 3 ⊢ 𝐴 ⊆ 𝐵 | |
3 | 2 | sseli 3913 | . 2 ⊢ (𝐶 ∈ 𝐴 → 𝐶 ∈ 𝐵) |
4 | 1, 3 | syl 17 | 1 ⊢ (𝜑 → 𝐶 ∈ 𝐵) |
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