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Mirrors > Home > MPE Home > Th. List > eleqtrrd | Structured version Visualization version GIF version |
Description: Deduction that substitutes equal classes into membership. (Contributed by NM, 14-Dec-2004.) |
Ref | Expression |
---|---|
eleqtrrd.1 | ⊢ (𝜑 → 𝐴 ∈ 𝐵) |
eleqtrrd.2 | ⊢ (𝜑 → 𝐶 = 𝐵) |
Ref | Expression |
---|---|
eleqtrrd | ⊢ (𝜑 → 𝐴 ∈ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleqtrrd.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝐵) | |
2 | eleqtrrd.2 | . . 3 ⊢ (𝜑 → 𝐶 = 𝐵) | |
3 | 2 | eqcomd 2745 | . 2 ⊢ (𝜑 → 𝐵 = 𝐶) |
4 | 1, 3 | eleqtrd 2842 | 1 ⊢ (𝜑 → 𝐴 ∈ 𝐶) |
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