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Mirrors > Home > ILE Home > Th. List > inton | GIF version |
Description: The intersection of the class of ordinal numbers is the empty set. (Contributed by NM, 20-Oct-2003.) |
Ref | Expression |
---|---|
inton | ⊢ ∩ On = ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0elon 4369 | . 2 ⊢ ∅ ∈ On | |
2 | int0el 3853 | . 2 ⊢ (∅ ∈ On → ∩ On = ∅) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ ∩ On = ∅ |
Colors of variables: wff set class |
Syntax hints: = wceq 1343 ∈ wcel 2136 ∅c0 3408 ∩ cint 3823 Oncon0 4340 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-ext 2147 ax-nul 4107 |
This theorem depends on definitions: df-bi 116 df-tru 1346 df-nf 1449 df-sb 1751 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2296 df-ral 2448 df-rex 2449 df-v 2727 df-dif 3117 df-in 3121 df-ss 3128 df-nul 3409 df-pw 3560 df-uni 3789 df-int 3824 df-tr 4080 df-iord 4343 df-on 4345 |
This theorem is referenced by: (None) |
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