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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 5650 | . 2 ⊢ (𝐴 ∈ On → Ord 𝐴) | |
2 | ordelon 5664 | . 2 ⊢ ((Ord 𝐴 ∧ 𝐵 ∈ 𝐴) → 𝐵 ∈ On) | |
3 | 1, 2 | sylan 487 | 1 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐴) → 𝐵 ∈ On) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 ∈ wcel 1977 Ord word 5639 Oncon0 5640 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pr 4833 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-tr 4681 df-eprel 4949 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-ord 5643 df-on 5644 |
This theorem is referenced by: oneli 5752 ssorduni 6877 unon 6923 tfindsg2 6953 dfom2 6959 ordom 6966 onfununi 7325 onnseq 7328 dfrecs3 7356 tz7.48-2 7424 tz7.49 7427 oalim 7499 omlim 7500 oelim 7501 oaordi 7513 oalimcl 7527 oaass 7528 omordi 7533 omlimcl 7545 odi 7546 omass 7547 omeulem1 7549 omeulem2 7550 omopth2 7551 oewordri 7559 oeordsuc 7561 oelimcl 7567 oeeui 7569 oaabs2 7612 omabs 7614 omxpenlem 7946 hartogs 8332 card2on 8342 cantnfle 8451 cantnflt 8452 cantnfp1lem2 8459 cantnfp1lem3 8460 cantnfp1 8461 oemapvali 8464 cantnflem1b 8466 cantnflem1c 8467 cantnflem1d 8468 cantnflem1 8469 cantnflem2 8470 cantnflem3 8471 cantnflem4 8472 cantnf 8473 cnfcomlem 8479 cnfcom3lem 8483 cnfcom3 8484 r1ordg 8524 r1val3 8584 tskwe 8659 iscard 8684 cardmin2 8707 infxpenlem 8719 infxpenc2lem2 8726 alephordi 8780 alephord2i 8783 alephle 8794 cardaleph 8795 cfub 8954 cfsmolem 8975 zorn2lem5 9205 zorn2lem6 9206 ttukeylem6 9219 ttukeylem7 9220 ondomon 9264 cardmin 9265 alephval2 9273 alephreg 9283 smobeth 9287 winainflem 9394 inar1 9476 inatsk 9479 dfrdg2 30945 sltval2 31053 sltres 31061 nodenselem5 31084 nodenselem7 31086 nobndlem6 31096 nobndup 31099 dfrdg4 31228 ontopbas 31597 onpsstopbas 31599 onint1 31618 |
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