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| Mirrors > Home > MPE Home > Th. List > elnn | Structured version Visualization version GIF version | ||
| Description: A member of a natural number is a natural number. (Contributed by NM, 21-Jun-1998.) |
| Ref | Expression |
|---|---|
| elnn | ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐵 ∈ ω) → 𝐴 ∈ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | trom 7867 | . 2 ⊢ Tr ω | |
| 2 | trel 5226 | . 2 ⊢ (Tr ω → ((𝐴 ∈ 𝐵 ∧ 𝐵 ∈ ω) → 𝐴 ∈ ω)) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐵 ∈ ω) → 𝐴 ∈ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 ∈ wcel 2143 Tr wtr 5218 ωcom 7858 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 ax-sep 5257 ax-pr 5404 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-clel 2838 df-ne 2959 df-ral 3080 df-rab 3417 df-v 3457 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-br 5110 df-opab 5174 df-tr 5219 df-eprel 5561 df-po 5569 df-so 5570 df-fr 5614 df-we 5616 df-ord 6363 df-on 6364 df-lim 6365 df-om 7859 |
| This theorem is referenced by: nnaordi 8600 nnmordi 8613 pssnn 9149 ssnnfi 9150 unfilem1 9261 unfilem2 9262 inf3lem5 9597 cantnflt 9637 cantnfp1lem3 9645 cantnflem1d 9653 cantnflem1 9654 cnfcomlem 9664 cnfcom 9665 ttrcltr 9681 ttrclselem2 9691 infpssrlem4 10285 axdc3lem2 10430 pwfseqlem3 10640 oldfi 28107 n0bday 28545 onltn0s 28551 bnj1098 35172 bnj517 35273 bnj594 35300 bnj1001 35347 bnj1118 35372 bnj1128 35378 bnj1145 35381 fineqvnttrclselem2 35535 fineqvnttrclselem3 35536 elhf2 36667 hfelhf 36673 |
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