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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 | ordom 7569 | . 2 ⊢ Ord ω | |
2 | ordtr 6173 | . 2 ⊢ (Ord ω → Tr ω) | |
3 | trel 5143 | . 2 ⊢ (Tr ω → ((𝐴 ∈ 𝐵 ∧ 𝐵 ∈ ω) → 𝐴 ∈ ω)) | |
4 | 1, 2, 3 | mp2b 10 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐵 ∈ ω) → 𝐴 ∈ ω) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 ∈ wcel 2111 Tr wtr 5136 Ord word 6158 ωcom 7560 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 ax-un 7441 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-rab 3115 df-v 3443 df-sbc 3721 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-tr 5137 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-we 5480 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-om 7561 |
This theorem is referenced by: nnaordi 8227 nnmordi 8240 pssnn 8720 ssnnfi 8721 unfilem1 8766 unfilem2 8767 inf3lem5 9079 cantnflt 9119 cantnfp1lem3 9127 cantnflem1d 9135 cantnflem1 9136 cnfcomlem 9146 cnfcom 9147 infpssrlem4 9717 axdc3lem2 9862 pwfseqlem3 10071 bnj1098 32165 bnj517 32267 bnj594 32294 bnj1001 32341 bnj1118 32366 bnj1128 32372 bnj1145 32375 elhf2 33749 hfelhf 33755 |
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