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Mirrors > Home > ILE Home > Th. List > breqtrrd | GIF version |
Description: Substitution of equal classes into a binary relation. (Contributed by NM, 24-Oct-1999.) |
Ref | Expression |
---|---|
breqtrrd.1 | ⊢ (𝜑 → 𝐴𝑅𝐵) |
breqtrrd.2 | ⊢ (𝜑 → 𝐶 = 𝐵) |
Ref | Expression |
---|---|
breqtrrd | ⊢ (𝜑 → 𝐴𝑅𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | breqtrrd.1 | . 2 ⊢ (𝜑 → 𝐴𝑅𝐵) | |
2 | breqtrrd.2 | . . 3 ⊢ (𝜑 → 𝐶 = 𝐵) | |
3 | 2 | eqcomd 2171 | . 2 ⊢ (𝜑 → 𝐵 = 𝐶) |
4 | 1, 3 | breqtrd 4008 | 1 ⊢ (𝜑 → 𝐴𝑅𝐶) |
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