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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 7854 | . 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 395 ∈ wcel 2109 Tr wtr 5217 ωcom 7845 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-ext 2702 ax-sep 5254 ax-nul 5264 ax-pr 5390 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-sb 2066 df-clab 2709 df-cleq 2722 df-clel 2804 df-ne 2927 df-ral 3046 df-rab 3409 df-v 3452 df-dif 3920 df-un 3922 df-ss 3934 df-nul 4300 df-if 4492 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-br 5111 df-opab 5173 df-tr 5218 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5594 df-we 5596 df-ord 6338 df-on 6339 df-lim 6340 df-om 7846 |
| This theorem is referenced by: nnaordi 8585 nnmordi 8598 pssnn 9138 ssnnfi 9139 unfilem1 9261 unfilem2 9262 inf3lem5 9592 cantnflt 9632 cantnfp1lem3 9640 cantnflem1d 9648 cantnflem1 9649 cnfcomlem 9659 cnfcom 9660 ttrcltr 9676 ttrclselem2 9686 infpssrlem4 10266 axdc3lem2 10411 pwfseqlem3 10620 oldfi 27832 n0sbday 28251 onltn0s 28255 zs12bday 28350 bnj1098 34780 bnj517 34882 bnj594 34909 bnj1001 34956 bnj1118 34981 bnj1128 34987 bnj1145 34990 elhf2 36170 hfelhf 36176 |
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