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Mirrors > Home > MPE Home > Th. List > sseqtrri | Structured version Visualization version GIF version |
Description: Substitution of equality into a subclass relationship. (Contributed by NM, 4-Apr-1995.) |
Ref | Expression |
---|---|
sseqtrri.1 | ⊢ 𝐴 ⊆ 𝐵 |
sseqtrri.2 | ⊢ 𝐶 = 𝐵 |
Ref | Expression |
---|---|
sseqtrri | ⊢ 𝐴 ⊆ 𝐶 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseqtrri.1 | . 2 ⊢ 𝐴 ⊆ 𝐵 | |
2 | sseqtrri.2 | . . 3 ⊢ 𝐶 = 𝐵 | |
3 | 2 | eqcomi 2748 | . 2 ⊢ 𝐵 = 𝐶 |
4 | 1, 3 | sseqtri 3961 | 1 ⊢ 𝐴 ⊆ 𝐶 |
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