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Mirrors > Home > MPE Home > Th. List > onelon | Structured version Visualization version GIF version |
Description: An element of an ordinal number is an ordinal number. Theorem 2.2(iii) of [BellMachover] p. 469. (Contributed by NM, 26-Oct-2003.) |
Ref | Expression |
---|---|
onelon | ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐴) → 𝐵 ∈ On) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eloni 6201 | . 2 ⊢ (𝐴 ∈ On → Ord 𝐴) | |
2 | ordelon 6215 | . 2 ⊢ ((Ord 𝐴 ∧ 𝐵 ∈ 𝐴) → 𝐵 ∈ On) | |
3 | 1, 2 | sylan 582 | 1 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐴) → 𝐵 ∈ On) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 ∈ wcel 2114 Ord word 6190 Oncon0 6191 |
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 2793 ax-sep 5203 ax-nul 5210 ax-pr 5330 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rab 3147 df-v 3496 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4839 df-br 5067 df-opab 5129 df-tr 5173 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-ord 6194 df-on 6195 |
This theorem is referenced by: oneli 6298 ssorduni 7500 unon 7546 tfindsg2 7576 dfom2 7582 ordom 7589 onfununi 7978 onnseq 7981 dfrecs3 8009 tz7.48-2 8078 tz7.49 8081 oalim 8157 omlim 8158 oelim 8159 oaordi 8172 oalimcl 8186 oaass 8187 omordi 8192 omlimcl 8204 odi 8205 omass 8206 omeulem1 8208 omeulem2 8209 omopth2 8210 oewordri 8218 oeordsuc 8220 oelimcl 8226 oeeui 8228 oaabs2 8272 omabs 8274 omxpenlem 8618 hartogs 9008 card2on 9018 cantnfle 9134 cantnflt 9135 cantnfp1lem3 9143 cantnfp1 9144 oemapvali 9147 cantnflem1b 9149 cantnflem1c 9150 cantnflem1d 9151 cantnflem1 9152 cantnflem2 9153 cantnflem3 9154 cantnflem4 9155 cantnf 9156 cnfcomlem 9162 cnfcom3lem 9166 cnfcom3 9167 r1ordg 9207 r1val3 9267 tskwe 9379 iscard 9404 cardmin2 9427 infxpenlem 9439 infxpenc2lem2 9446 alephordi 9500 alephord2i 9503 alephle 9514 cardaleph 9515 cfub 9671 cfsmolem 9692 zorn2lem5 9922 zorn2lem6 9923 ttukeylem6 9936 ttukeylem7 9937 ondomon 9985 cardmin 9986 alephval2 9994 alephreg 10004 smobeth 10008 winainflem 10115 inar1 10197 inatsk 10200 dfrdg2 33040 sltval2 33163 sltres 33169 nosepeq 33189 nosupno 33203 nosupres 33207 nosupbnd1lem1 33208 nosupbnd2lem1 33215 nosupbnd2 33216 dfrdg4 33412 ontopbas 33776 onpsstopbas 33778 onint1 33797 |
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