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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 7817 | . 2 ⊢ Tr ω | |
| 2 | trel 5213 | . 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 2113 Tr wtr 5205 ωcom 7808 |
| 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 2708 ax-sep 5241 ax-nul 5251 ax-pr 5377 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-ral 3052 df-rab 3400 df-v 3442 df-dif 3904 df-un 3906 df-ss 3918 df-nul 4286 df-if 4480 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-opab 5161 df-tr 5206 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 7809 |
| This theorem is referenced by: nnaordi 8546 nnmordi 8559 pssnn 9093 ssnnfi 9094 unfilem1 9205 unfilem2 9206 inf3lem5 9541 cantnflt 9581 cantnfp1lem3 9589 cantnflem1d 9597 cantnflem1 9598 cnfcomlem 9608 cnfcom 9609 ttrcltr 9625 ttrclselem2 9635 infpssrlem4 10216 axdc3lem2 10361 pwfseqlem3 10571 oldfi 27910 n0bday 28348 onltn0s 28354 bnj1098 34939 bnj517 35041 bnj594 35068 bnj1001 35115 bnj1118 35140 bnj1128 35146 bnj1145 35149 fineqvnttrclselem2 35278 fineqvnttrclselem3 35279 elhf2 36369 hfelhf 36375 |
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