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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 7819 | . 2 ⊢ Tr ω | |
| 2 | trel 5201 | . 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 2114 Tr wtr 5193 ωcom 7810 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-sep 5231 ax-pr 5370 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-ral 3053 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-tr 5194 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-ord 6320 df-on 6321 df-lim 6322 df-om 7811 |
| This theorem is referenced by: nnaordi 8547 nnmordi 8560 pssnn 9096 ssnnfi 9097 unfilem1 9208 unfilem2 9209 inf3lem5 9544 cantnflt 9584 cantnfp1lem3 9592 cantnflem1d 9600 cantnflem1 9601 cnfcomlem 9611 cnfcom 9612 ttrcltr 9628 ttrclselem2 9638 infpssrlem4 10219 axdc3lem2 10364 pwfseqlem3 10574 oldfi 27920 n0bday 28358 onltn0s 28364 bnj1098 34942 bnj517 35043 bnj594 35070 bnj1001 35117 bnj1118 35142 bnj1128 35148 bnj1145 35151 fineqvnttrclselem2 35282 fineqvnttrclselem3 35283 elhf2 36373 hfelhf 36379 |
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