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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 7826 | . 2 ⊢ Tr ω | |
| 2 | trel 5200 | . 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 5192 ωcom 7817 |
| 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 2708 ax-sep 5231 ax-pr 5375 |
| 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 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-ral 3052 df-rab 3390 df-v 3431 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-br 5086 df-opab 5148 df-tr 5193 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-ord 6326 df-on 6327 df-lim 6328 df-om 7818 |
| This theorem is referenced by: nnaordi 8554 nnmordi 8567 pssnn 9103 ssnnfi 9104 unfilem1 9215 unfilem2 9216 inf3lem5 9553 cantnflt 9593 cantnfp1lem3 9601 cantnflem1d 9609 cantnflem1 9610 cnfcomlem 9620 cnfcom 9621 ttrcltr 9637 ttrclselem2 9647 infpssrlem4 10228 axdc3lem2 10373 pwfseqlem3 10583 oldfi 27906 n0bday 28344 onltn0s 28350 bnj1098 34926 bnj517 35027 bnj594 35054 bnj1001 35101 bnj1118 35126 bnj1128 35132 bnj1145 35135 fineqvnttrclselem2 35266 fineqvnttrclselem3 35267 elhf2 36357 hfelhf 36363 |
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