Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > erdm | 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 6106 | . 2 ⊢ (𝑅 Er 𝐴 ↔ (Rel 𝑅 ∧ dom 𝑅 = 𝐴 ∧ (◡𝑅 ∪ (𝑅 ∘ 𝑅)) ⊆ 𝑅)) | |
2 | 1 | simp2bi 920 | 1 ⊢ (𝑅 Er 𝐴 → dom 𝑅 = 𝐴) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1243 ∪ cun 2915 ⊆ wss 2917 ◡ccnv 4344 dom cdm 4345 ∘ ccom 4349 Rel wrel 4350 Er wer 6103 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 |
This theorem depends on definitions: df-bi 110 df-3an 887 df-er 6106 |
This theorem is referenced by: ercl 6117 erref 6126 errn 6128 erssxp 6129 erexb 6131 ereldm 6149 uniqs2 6166 iinerm 6178 th3qlem1 6208 0nnq 6462 nnnq0lem1 6544 prsrlem1 6827 gt0srpr 6833 0nsr 6834 |
Copyright terms: Public domain | W3C validator |