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Mirrors > Home > MPE Home > Th. List > 3eqtrd | Structured version Visualization version GIF version |
Description: A deduction from three chained equalities. (Contributed by NM, 29-Oct-1995.) |
Ref | Expression |
---|---|
3eqtrd.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
3eqtrd.2 | ⊢ (𝜑 → 𝐵 = 𝐶) |
3eqtrd.3 | ⊢ (𝜑 → 𝐶 = 𝐷) |
Ref | Expression |
---|---|
3eqtrd | ⊢ (𝜑 → 𝐴 = 𝐷) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3eqtrd.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
2 | 3eqtrd.2 | . . 3 ⊢ (𝜑 → 𝐵 = 𝐶) | |
3 | 3eqtrd.3 | . . 3 ⊢ (𝜑 → 𝐶 = 𝐷) | |
4 | 2, 3 | eqtrd 2779 | . 2 ⊢ (𝜑 → 𝐵 = 𝐷) |
5 | 1, 4 | eqtrd 2779 | 1 ⊢ (𝜑 → 𝐴 = 𝐷) |
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