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| Mirrors > Home > ILE Home > Th. List > tr0 | GIF version | ||
| Description: The empty set is transitive. (Contributed by NM, 16-Sep-1993.) |
| Ref | Expression |
|---|---|
| tr0 | ⊢ Tr ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0ss 3535 | . 2 ⊢ ∅ ⊆ 𝒫 ∅ | |
| 2 | dftr4 4197 | . 2 ⊢ (Tr ∅ ↔ ∅ ⊆ 𝒫 ∅) | |
| 3 | 1, 2 | mpbir 146 | 1 ⊢ Tr ∅ |
| Colors of variables: wff set class |
| Syntax hints: ⊆ wss 3201 ∅c0 3496 𝒫 cpw 3656 Tr wtr 4192 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ral 2516 df-v 2805 df-dif 3203 df-in 3207 df-ss 3214 df-nul 3497 df-pw 3658 df-uni 3899 df-tr 4193 |
| This theorem is referenced by: ord0 4494 ordom 4711 |
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