| Intuitionistic Logic Explorer | 
      
      
      < Previous  
      Next >
      
       Nearby theorems  | 
  ||
| 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 3489 | . 2 ⊢ ∅ ⊆ 𝒫 ∅ | |
| 2 | dftr4 4136 | . 2 ⊢ (Tr ∅ ↔ ∅ ⊆ 𝒫 ∅) | |
| 3 | 1, 2 | mpbir 146 | 1 ⊢ Tr ∅ | 
| Colors of variables: wff set class | 
| Syntax hints: ⊆ wss 3157 ∅c0 3450 𝒫 cpw 3605 Tr wtr 4131 | 
| 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 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-ext 2178 | 
| This theorem depends on definitions: df-bi 117 df-tru 1367 df-nf 1475 df-sb 1777 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ral 2480 df-v 2765 df-dif 3159 df-in 3163 df-ss 3170 df-nul 3451 df-pw 3607 df-uni 3840 df-tr 4132 | 
| This theorem is referenced by: ord0 4426 ordom 4643 | 
| Copyright terms: Public domain | W3C validator |