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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 5733 | . 2 ⊢ (𝐴 ∈ On → Ord 𝐴) | |
2 | ordelon 5747 | . 2 ⊢ ((Ord 𝐴 ∧ 𝐵 ∈ 𝐴) → 𝐵 ∈ On) | |
3 | 1, 2 | sylan 488 | 1 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐴) → 𝐵 ∈ On) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 384 ∈ wcel 1990 Ord word 5722 Oncon0 5723 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pr 4906 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-opab 4713 df-tr 4753 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-ord 5726 df-on 5727 |
This theorem is referenced by: oneli 5835 ssorduni 6985 unon 7031 tfindsg2 7061 dfom2 7067 ordom 7074 onfununi 7438 onnseq 7441 dfrecs3 7469 tz7.48-2 7537 tz7.49 7540 oalim 7612 omlim 7613 oelim 7614 oaordi 7626 oalimcl 7640 oaass 7641 omordi 7646 omlimcl 7658 odi 7659 omass 7660 omeulem1 7662 omeulem2 7663 omopth2 7664 oewordri 7672 oeordsuc 7674 oelimcl 7680 oeeui 7682 oaabs2 7725 omabs 7727 omxpenlem 8061 hartogs 8449 card2on 8459 cantnfle 8568 cantnflt 8569 cantnfp1lem2 8576 cantnfp1lem3 8577 cantnfp1 8578 oemapvali 8581 cantnflem1b 8583 cantnflem1c 8584 cantnflem1d 8585 cantnflem1 8586 cantnflem2 8587 cantnflem3 8588 cantnflem4 8589 cantnf 8590 cnfcomlem 8596 cnfcom3lem 8600 cnfcom3 8601 r1ordg 8641 r1val3 8701 tskwe 8776 iscard 8801 cardmin2 8824 infxpenlem 8836 infxpenc2lem2 8843 alephordi 8897 alephord2i 8900 alephle 8911 cardaleph 8912 cfub 9071 cfsmolem 9092 zorn2lem5 9322 zorn2lem6 9323 ttukeylem6 9336 ttukeylem7 9337 ondomon 9385 cardmin 9386 alephval2 9394 alephreg 9404 smobeth 9408 winainflem 9515 inar1 9597 inatsk 9600 dfrdg2 31701 sltval2 31809 sltres 31815 nosepeq 31835 nosupno 31849 nosupres 31853 nosupbnd1lem1 31854 nosupbnd2lem1 31861 nosupbnd2 31862 dfrdg4 32058 ontopbas 32427 onpsstopbas 32429 onint1 32448 |
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