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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 7591 | . 2 ⊢ Ord ω | |
2 | ordtr 6207 | . 2 ⊢ (Ord ω → Tr ω) | |
3 | trel 5181 | . 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 398 ∈ wcel 2114 Tr wtr 5174 Ord word 6192 ωcom 7582 |
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 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pr 5332 ax-un 7463 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-sbc 3775 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-tr 5175 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-we 5518 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-om 7583 |
This theorem is referenced by: nnaordi 8246 nnmordi 8259 pssnn 8738 ssnnfi 8739 unfilem1 8784 unfilem2 8785 inf3lem5 9097 cantnflt 9137 cantnfp1lem3 9145 cantnflem1d 9153 cantnflem1 9154 cnfcomlem 9164 cnfcom 9165 infpssrlem4 9730 axdc3lem2 9875 pwfseqlem3 10084 bnj1098 32057 bnj517 32159 bnj594 32186 bnj1001 32233 bnj1118 32258 bnj1128 32264 bnj1145 32267 elhf2 33638 hfelhf 33644 |
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