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Mirrors > Home > MPE Home > Th. List > 3eqtr4g | Structured version Visualization version GIF version |
Description: A chained equality inference, useful for converting to definitions. (Contributed by NM, 21-Jun-1993.) |
Ref | Expression |
---|---|
3eqtr4g.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
3eqtr4g.2 | ⊢ 𝐶 = 𝐴 |
3eqtr4g.3 | ⊢ 𝐷 = 𝐵 |
Ref | Expression |
---|---|
3eqtr4g | ⊢ (𝜑 → 𝐶 = 𝐷) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3eqtr4g.2 | . . 3 ⊢ 𝐶 = 𝐴 | |
2 | 3eqtr4g.1 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐵) | |
3 | 1, 2 | eqtrid 2790 | . 2 ⊢ (𝜑 → 𝐶 = 𝐵) |
4 | 3eqtr4g.3 | . 2 ⊢ 𝐷 = 𝐵 | |
5 | 3, 4 | eqtr4di 2797 | 1 ⊢ (𝜑 → 𝐶 = 𝐷) |
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