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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 8105 | . 2 ⊢ 2o = suc 1o | |
2 | 1on 8111 | . . 3 ⊢ 1o ∈ On | |
3 | 2 | onsuci 7555 | . 2 ⊢ suc 1o ∈ On |
4 | 1, 3 | eqeltri 2911 | 1 ⊢ 2o ∈ On |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2114 Oncon0 6193 suc csuc 6195 1oc1o 8097 2oc2o 8098 |
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 2795 ax-sep 5205 ax-nul 5212 ax-pr 5332 ax-un 7463 |
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 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-sbc 3775 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-tr 5175 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-we 5518 df-ord 6196 df-on 6197 df-suc 6199 df-1o 8104 df-2o 8105 |
This theorem is referenced by: 3on 8116 o2p2e4 8168 o2p2e4OLD 8169 oneo 8209 nneob 8281 infxpenc 9446 infxpenc2 9450 mappwen 9540 pwdjuen 9609 ackbij1lem5 9648 sdom2en01 9726 fin1a2lem4 9827 fin1a2lem6 9829 xpsrnbas 16846 xpsadd 16849 xpsmul 16850 xpsvsca 16852 xpsle 16854 xpsmnd 17953 xpsgrp 18220 efgval 18845 efgtf 18850 frgpcpbl 18887 frgp0 18888 frgpeccl 18889 frgpadd 18891 frgpmhm 18893 vrgpf 18896 vrgpinv 18897 frgpupf 18901 frgpup1 18903 frgpup2 18904 frgpup3lem 18905 frgpnabllem1 18995 frgpnabllem2 18996 xpstopnlem1 22419 xpstps 22420 xpstopnlem2 22421 xpsxmetlem 22991 xpsdsval 22993 nofv 33166 sltres 33171 noextendgt 33179 nolesgn2ores 33181 nosepnelem 33186 nosepdmlem 33189 nolt02o 33201 nosupno 33205 nosupbday 33207 nosupbnd1lem3 33212 nosupbnd1 33216 nosupbnd2lem1 33217 nosupbnd2 33218 ssoninhaus 33798 onint1 33799 1oequni2o 34651 finxpreclem4 34677 pw2f1ocnv 39641 frlmpwfi 39705 tr3dom 39901 enrelmap 40350 |
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