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Mirrors > Home > MPE Home > Th. List > 2on | Structured version Visualization version GIF version |
Description: Ordinal 2 is an ordinal number. (Contributed by NM, 18-Feb-2004.) (Proof shortened by Andrew Salmon, 12-Aug-2011.) |
Ref | Expression |
---|---|
2on | ⊢ 2𝑜 ∈ On |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-2o 7448 | . 2 ⊢ 2𝑜 = suc 1𝑜 | |
2 | 1on 7454 | . . 3 ⊢ 1𝑜 ∈ On | |
3 | 2 | onsuci 6930 | . 2 ⊢ suc 1𝑜 ∈ On |
4 | 1, 3 | eqeltri 2684 | 1 ⊢ 2𝑜 ∈ On |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 1977 Oncon0 5640 suc csuc 5642 1𝑜c1o 7440 2𝑜c2o 7441 |
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-8 1979 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 ax-un 6847 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 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-sbc 3403 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 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 df-suc 5646 df-1o 7447 df-2o 7448 |
This theorem is referenced by: 3on 7457 o2p2e4 7508 oneo 7548 infxpenc 8724 infxpenc2 8728 mappwen 8818 pwcdaen 8890 sdom2en01 9007 fin1a2lem4 9108 xpslem 16056 xpsadd 16059 xpsmul 16060 xpsvsca 16062 xpsle 16064 xpsmnd 17153 xpsgrp 17357 efgval 17953 efgtf 17958 frgpcpbl 17995 frgp0 17996 frgpeccl 17997 frgpadd 17999 frgpmhm 18001 vrgpf 18004 vrgpinv 18005 frgpupf 18009 frgpup1 18011 frgpup2 18012 frgpup3lem 18013 frgpnabllem1 18099 frgpnabllem2 18100 xpstopnlem1 21422 xpstps 21423 xpstopnlem2 21424 xpsxmetlem 21994 xpsdsval 21996 nofv 31054 sltres 31061 noxp2o 31064 nobndup 31099 ssoninhaus 31617 onint1 31618 1oequni2o 32392 finxpreclem4 32407 pw2f1ocnv 36622 frlmpwfi 36686 enrelmap 37311 clsk1indlem1 37363 clsk1independent 37364 |
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