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Mirrors > Home > MPE Home > Th. List > sseqtr4d | Structured version Visualization version GIF version |
Description: Substitution of equality into a subclass relationship. (Contributed by NM, 25-Apr-2004.) |
Ref | Expression |
---|---|
sseqtr4d.1 | ⊢ (𝜑 → 𝐴 ⊆ 𝐵) |
sseqtr4d.2 | ⊢ (𝜑 → 𝐶 = 𝐵) |
Ref | Expression |
---|---|
sseqtr4d | ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseqtr4d.1 | . 2 ⊢ (𝜑 → 𝐴 ⊆ 𝐵) | |
2 | sseqtr4d.2 | . . 3 ⊢ (𝜑 → 𝐶 = 𝐵) | |
3 | 2 | eqcomd 2616 | . 2 ⊢ (𝜑 → 𝐵 = 𝐶) |
4 | 1, 3 | sseqtrd 3604 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
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