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Related theorems GIF version |
| Description: The epsilon relation is founded on any class. |
| Ref | Expression |
|---|---|
| zfregfr | ⊢ E Fr A |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dfepfr 2184 | . 2 ⊢ (E Fr A ↔ ∀x((x ⊆ A ∧ ¬ x = ∅) → ∃y ∈ x (x ∩ y) = ∅)) | |
| 2 | visset 1350 | . . . 4 ⊢ x ∈ V | |
| 3 | 2 | zfreg2 3448 | . . 3 ⊢ (¬ x = ∅ → ∃y ∈ x (x ∩ y) = ∅) |
| 4 | 3 | adantl 305 | . 2 ⊢ ((x ⊆ A ∧ ¬ x = ∅) → ∃y ∈ x (x ∩ y) = ∅) |
| 5 | 1, 4 | mpgbir 686 | 1 ⊢ E Fr A |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 1 → wi 2 ∧ wa 196 = wceq 1091 ∃wrex 1202 ∩ cin 1486 ⊆ wss 1487 ∅c0 1707 Ecep 2056 Fr wfr 2061 |
| This theorem is referenced by: en2lp 3453 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 ax-reg 1078 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-ral 1205 df-rex 1206 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-br 2063 df-opab 2098 df-eprel 2122 df-fr 2169 |