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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 8103 | . 2 ⊢ 2o = suc 1o | |
2 | 1on 8109 | . . 3 ⊢ 1o ∈ On | |
3 | 2 | onsuci 7553 | . 2 ⊢ suc 1o ∈ On |
4 | 1, 3 | eqeltri 2909 | 1 ⊢ 2o ∈ On |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2114 Oncon0 6191 suc csuc 6193 1oc1o 8095 2oc2o 8096 |
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 ax-un 7461 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 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-rex 3144 df-rab 3147 df-v 3496 df-sbc 3773 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 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 df-suc 6197 df-1o 8102 df-2o 8103 |
This theorem is referenced by: 3on 8114 o2p2e4 8166 o2p2e4OLD 8167 oneo 8207 nneob 8279 infxpenc 9444 infxpenc2 9448 mappwen 9538 pwdjuen 9607 ackbij1lem5 9646 sdom2en01 9724 fin1a2lem4 9825 fin1a2lem6 9827 xpsrnbas 16844 xpsadd 16847 xpsmul 16848 xpsvsca 16850 xpsle 16852 xpsmnd 17951 xpsgrp 18218 efgval 18843 efgtf 18848 frgpcpbl 18885 frgp0 18886 frgpeccl 18887 frgpadd 18889 frgpmhm 18891 vrgpf 18894 vrgpinv 18895 frgpupf 18899 frgpup1 18901 frgpup2 18902 frgpup3lem 18903 frgpnabllem1 18993 frgpnabllem2 18994 xpstopnlem1 22417 xpstps 22418 xpstopnlem2 22419 xpsxmetlem 22989 xpsdsval 22991 nofv 33164 sltres 33169 noextendgt 33177 nolesgn2ores 33179 nosepnelem 33184 nosepdmlem 33187 nolt02o 33199 nosupno 33203 nosupbday 33205 nosupbnd1lem3 33210 nosupbnd1 33214 nosupbnd2lem1 33215 nosupbnd2 33216 ssoninhaus 33796 onint1 33797 1oequni2o 34652 finxpreclem4 34678 pw2f1ocnv 39654 frlmpwfi 39718 tr3dom 39914 enrelmap 40363 |
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