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Mirrors > Home > ILE Home > Th. List > brel | GIF version |
Description: Two things in a binary relation belong to the relation's domain. (Contributed by NM, 17-May-1996.) (Revised by Mario Carneiro, 26-Apr-2015.) |
Ref | Expression |
---|---|
brel.1 | ⊢ 𝑅 ⊆ (𝐶 × 𝐷) |
Ref | Expression |
---|---|
brel | ⊢ (𝐴𝑅𝐵 → (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | brel.1 | . . 3 ⊢ 𝑅 ⊆ (𝐶 × 𝐷) | |
2 | 1 | ssbri 4026 | . 2 ⊢ (𝐴𝑅𝐵 → 𝐴(𝐶 × 𝐷)𝐵) |
3 | brxp 4635 | . 2 ⊢ (𝐴(𝐶 × 𝐷)𝐵 ↔ (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷)) | |
4 | 2, 3 | sylib 121 | 1 ⊢ (𝐴𝑅𝐵 → (𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷)) |
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