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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 4284 | . . 3 ⊢ ¬ ∅ ∈ ∅ | |
| 2 | simp2 1155 | . . 3 ⊢ ((Ord ∅ ∧ ∅ ∈ ∅ ∧ ∅ = ∪ ∅) → ∅ ∈ ∅) | |
| 3 | 1, 2 | mto 200 | . 2 ⊢ ¬ (Ord ∅ ∧ ∅ ∈ ∅ ∧ ∅ = ∪ ∅) |
| 4 | dflim2 6416 | . 2 ⊢ (Lim ∅ ↔ (Ord ∅ ∧ ∅ ∈ ∅ ∧ ∅ = ∪ ∅)) | |
| 5 | 3, 4 | mtbir 326 | 1 ⊢ ¬ Lim ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 ∧ w3a 1103 = wceq 1570 ∈ wcel 2145 ∅c0 4279 ∪ cuni 4867 Ord word 6356 Lim wlim 6358 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2732 ax-sep 5251 ax-pr 5398 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-tr 5213 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-ord 6360 df-lim 6362 |
| This theorem is used by: tz7.44lem1 8395 tz7.44-3 8398 1ellim 8486 2ellim 8487 cflim2 10266 rankcf 10787 dfrdg4 36531 limsucncmpi 37065 onov0suclim 44116 |
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