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Related theorems GIF version |
| Description: The empty set is transitive. |
| Ref | Expression |
|---|---|
| tr0 | ⊢ Tr ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0ss 1725 | . 2 ⊢ ∅ ⊆ ℘∅ | |
| 2 | dftr4 2046 | . 2 ⊢ (Tr ∅ ↔ ∅ ⊆ ℘∅) | |
| 3 | 1, 2 | mpbir 165 | 1 ⊢ Tr ∅ |
| Colors of variables: wff set class |
| Syntax hints: ⊆ wss 1487 ∅c0 1707 ℘cpw 1798 Tr wtr 2041 |
| This theorem is referenced by: ord0 2276 r1tr 3498 |
| 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-16 922 ax-17 925 ax-ext 1074 |
| 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-v 1349 df-dif 1489 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-uni 1920 df-tr 2042 |