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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 3530 | . 2 ⊢ ∅ ⊆ 𝒫 ∅ | |
| 2 | dftr4 4186 | . 2 ⊢ (Tr ∅ ↔ ∅ ⊆ 𝒫 ∅) | |
| 3 | 1, 2 | mpbir 146 | 1 ⊢ Tr ∅ |
| Colors of variables: wff set class |
| Syntax hints: ⊆ wss 3197 ∅c0 3491 𝒫 cpw 3649 Tr wtr 4181 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-v 2801 df-dif 3199 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-uni 3888 df-tr 4182 |
| This theorem is referenced by: ord0 4479 ordom 4696 |
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