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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 3501 | . 2 ⊢ ∅ ⊆ 𝒫 ∅ | |
| 2 | dftr4 4152 | . 2 ⊢ (Tr ∅ ↔ ∅ ⊆ 𝒫 ∅) | |
| 3 | 1, 2 | mpbir 146 | 1 ⊢ Tr ∅ |
| Colors of variables: wff set class |
| Syntax hints: ⊆ wss 3168 ∅c0 3462 𝒫 cpw 3618 Tr wtr 4147 |
| 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 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-ext 2188 |
| This theorem depends on definitions: df-bi 117 df-tru 1376 df-nf 1485 df-sb 1787 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 df-v 2775 df-dif 3170 df-in 3174 df-ss 3181 df-nul 3463 df-pw 3620 df-uni 3854 df-tr 4148 |
| This theorem is referenced by: ord0 4443 ordom 4660 |
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