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Mirrors > Home > MPE Home > Th. List > sseqtrrdi | Structured version Visualization version GIF version |
Description: A chained subclass and equality deduction. (Contributed by NM, 25-Apr-2004.) |
Ref | Expression |
---|---|
sseqtrrdi.1 | ⊢ (𝜑 → 𝐴 ⊆ 𝐵) |
sseqtrrdi.2 | ⊢ 𝐶 = 𝐵 |
Ref | Expression |
---|---|
sseqtrrdi | ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseqtrrdi.1 | . 2 ⊢ (𝜑 → 𝐴 ⊆ 𝐵) | |
2 | sseqtrrdi.2 | . . 3 ⊢ 𝐶 = 𝐵 | |
3 | 2 | eqcomi 2747 | . 2 ⊢ 𝐵 = 𝐶 |
4 | 1, 3 | sseqtrdi 3967 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
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