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Mirrors > Home > MPE Home > Th. List > df2o3 | Structured version Visualization version GIF version |
Description: Expanded value of the ordinal number 2. (Contributed by Mario Carneiro, 14-Aug-2015.) |
Ref | Expression |
---|---|
df2o3 | ⊢ 2o = {∅, 1o} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-2o 8103 | . 2 ⊢ 2o = suc 1o | |
2 | df-suc 6197 | . 2 ⊢ suc 1o = (1o ∪ {1o}) | |
3 | df1o2 8116 | . . . 4 ⊢ 1o = {∅} | |
4 | 3 | uneq1i 4135 | . . 3 ⊢ (1o ∪ {1o}) = ({∅} ∪ {1o}) |
5 | df-pr 4570 | . . 3 ⊢ {∅, 1o} = ({∅} ∪ {1o}) | |
6 | 4, 5 | eqtr4i 2847 | . 2 ⊢ (1o ∪ {1o}) = {∅, 1o} |
7 | 1, 2, 6 | 3eqtri 2848 | 1 ⊢ 2o = {∅, 1o} |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 ∪ cun 3934 ∅c0 4291 {csn 4567 {cpr 4569 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 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-v 3496 df-dif 3939 df-un 3941 df-nul 4292 df-pr 4570 df-suc 6197 df-1o 8102 df-2o 8103 |
This theorem is referenced by: df2o2 8118 2oconcl 8128 map2xp 8687 1sdom 8721 cantnflem2 9153 xp2dju 9602 sdom2en01 9724 sadcf 15802 fnpr2o 16830 fnpr2ob 16831 fvprif 16834 xpsfrnel 16835 xpsfeq 16836 xpsle 16852 setcepi 17348 efgi0 18846 efgi1 18847 vrgpf 18894 vrgpinv 18895 frgpuptinv 18897 frgpup2 18902 frgpup3lem 18903 frgpnabllem1 18993 dmdprdpr 19171 dprdpr 19172 xpstopnlem1 22417 xpstopnlem2 22419 xpsxmetlem 22989 xpsdsval 22991 xpsmet 22992 onint1 33797 pw2f1ocnv 39654 wepwsolem 39662 df3o2 40394 clsk1independent 40416 |
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