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Mirrors > Home > MPE Home > Th. List > syl5ss | Structured version Visualization version GIF version |
Description: Subclass transitivity deduction. (Contributed by NM, 6-Feb-2014.) |
Ref | Expression |
---|---|
syl5ss.1 | ⊢ 𝐴 ⊆ 𝐵 |
syl5ss.2 | ⊢ (𝜑 → 𝐵 ⊆ 𝐶) |
Ref | Expression |
---|---|
syl5ss | ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | syl5ss.1 | . . 3 ⊢ 𝐴 ⊆ 𝐵 | |
2 | 1 | a1i 11 | . 2 ⊢ (𝜑 → 𝐴 ⊆ 𝐵) |
3 | syl5ss.2 | . 2 ⊢ (𝜑 → 𝐵 ⊆ 𝐶) | |
4 | 2, 3 | sstrd 3578 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
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