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| Mirrors > Home > MPE Home > Th. List > nlim0 | Structured version Visualization version GIF version | ||
| Description: The empty set is not a limit ordinal. (Contributed by NM, 24-Mar-1995.) (Proof shortened by Andrew Salmon, 25-Jul-2011.) |
| Ref | Expression |
|---|---|
| nlim0 | ⊢ ¬ Lim ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | noel 4287 | . . 3 ⊢ ¬ ∅ ∈ ∅ | |
| 2 | simp2 1137 | . . 3 ⊢ ((Ord ∅ ∧ ∅ ∈ ∅ ∧ ∅ = ∪ ∅) → ∅ ∈ ∅) | |
| 3 | 1, 2 | mto 197 | . 2 ⊢ ¬ (Ord ∅ ∧ ∅ ∈ ∅ ∧ ∅ = ∪ ∅) |
| 4 | dflim2 6372 | . 2 ⊢ (Lim ∅ ↔ (Ord ∅ ∧ ∅ ∈ ∅ ∧ ∅ = ∪ ∅)) | |
| 5 | 3, 4 | mtbir 323 | 1 ⊢ ¬ Lim ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∧ w3a 1086 = wceq 1541 ∈ wcel 2113 ∅c0 4282 ∪ cuni 4860 Ord word 6313 Lim wlim 6315 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2705 ax-sep 5238 ax-nul 5248 ax-pr 5374 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2712 df-cleq 2725 df-clel 2808 df-ne 2930 df-ral 3049 df-rex 3058 df-rab 3397 df-v 3439 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4283 df-if 4477 df-pw 4553 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4861 df-br 5096 df-opab 5158 df-tr 5203 df-eprel 5521 df-po 5529 df-so 5530 df-fr 5574 df-we 5576 df-ord 6317 df-lim 6319 |
| This theorem is referenced by: tz7.44lem1 8333 tz7.44-3 8336 1ellim 8422 2ellim 8423 cflim2 10165 rankcf 10679 dfrdg4 36067 limsucncmpi 36561 onov0suclim 43431 |
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