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Mirrors > Home > MPE Home > Th. List > eqsstrdi | Structured version Visualization version GIF version |
Description: A chained subclass and equality deduction. (Contributed by Mario Carneiro, 2-Jan-2017.) |
Ref | Expression |
---|---|
eqsstrdi.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
eqsstrdi.2 | ⊢ 𝐵 ⊆ 𝐶 |
Ref | Expression |
---|---|
eqsstrdi | ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqsstrdi.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
2 | eqsstrdi.2 | . . 3 ⊢ 𝐵 ⊆ 𝐶 | |
3 | 2 | a1i 11 | . 2 ⊢ (𝜑 → 𝐵 ⊆ 𝐶) |
4 | 1, 3 | eqsstrd 3958 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
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