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Mirrors > Home > MPE Home > Th. List > erdm | Structured version Visualization version GIF version |
Description: The domain of an equivalence relation. (Contributed by Mario Carneiro, 12-Aug-2015.) |
Ref | Expression |
---|---|
erdm | ⊢ (𝑅 Er 𝐴 → dom 𝑅 = 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-er 7629 | . 2 ⊢ (𝑅 Er 𝐴 ↔ (Rel 𝑅 ∧ dom 𝑅 = 𝐴 ∧ (◡𝑅 ∪ (𝑅 ∘ 𝑅)) ⊆ 𝑅)) | |
2 | 1 | simp2bi 1070 | 1 ⊢ (𝑅 Er 𝐴 → dom 𝑅 = 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1475 ∪ cun 3538 ⊆ wss 3540 ◡ccnv 5037 dom cdm 5038 ∘ ccom 5042 Rel wrel 5043 Er wer 7626 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 196 df-an 385 df-3an 1033 df-er 7629 |
This theorem is referenced by: ercl 7640 erref 7649 errn 7651 erssxp 7652 erexb 7654 ereldm 7677 uniqs2 7696 iiner 7706 eceqoveq 7740 prsrlem1 9772 ltsrpr 9777 0nsr 9779 divsfval 16030 sylow1lem3 17838 sylow1lem5 17840 sylow2a 17857 vitalilem2 23184 vitalilem3 23185 vitalilem5 23187 |
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