Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
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 8105 | . 2 ⊢ 2o = suc 1o | |
2 | df-suc 6199 | . 2 ⊢ suc 1o = (1o ∪ {1o}) | |
3 | df1o2 8118 | . . . 4 ⊢ 1o = {∅} | |
4 | 3 | uneq1i 4137 | . . 3 ⊢ (1o ∪ {1o}) = ({∅} ∪ {1o}) |
5 | df-pr 4572 | . . 3 ⊢ {∅, 1o} = ({∅} ∪ {1o}) | |
6 | 4, 5 | eqtr4i 2849 | . 2 ⊢ (1o ∪ {1o}) = {∅, 1o} |
7 | 1, 2, 6 | 3eqtri 2850 | 1 ⊢ 2o = {∅, 1o} |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 ∪ cun 3936 ∅c0 4293 {csn 4569 {cpr 4571 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 |
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 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-v 3498 df-dif 3941 df-un 3943 df-nul 4294 df-pr 4572 df-suc 6199 df-1o 8104 df-2o 8105 |
This theorem is referenced by: df2o2 8120 2oconcl 8130 map2xp 8689 1sdom 8723 cantnflem2 9155 xp2dju 9604 sdom2en01 9726 sadcf 15804 fnpr2o 16832 fnpr2ob 16833 fvprif 16836 xpsfrnel 16837 xpsfeq 16838 xpsle 16854 setcepi 17350 efgi0 18848 efgi1 18849 vrgpf 18896 vrgpinv 18897 frgpuptinv 18899 frgpup2 18904 frgpup3lem 18905 frgpnabllem1 18995 dmdprdpr 19173 dprdpr 19174 xpstopnlem1 22419 xpstopnlem2 22421 xpsxmetlem 22991 xpsdsval 22993 xpsmet 22994 onint1 33799 pw2f1ocnv 39641 wepwsolem 39649 df3o2 40381 clsk1independent 40403 |
Copyright terms: Public domain | W3C validator |