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Related theorems GIF version |
| Description: An ordered pair of classes is a set. Exercise 7 of [TakeutiZaring] p. 16. |
| Ref | Expression |
|---|---|
| opex | ⊢ 〈A, B〉 ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-op 1815 | . 2 ⊢ 〈A, B〉 = {{A}, {A, B}} | |
| 2 | prex 1892 | . 2 ⊢ {{A}, {A, B}} ∈ V | |
| 3 | 1, 2 | eqeltr 1159 | 1 ⊢ 〈A, B〉 ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 1092 Vcvv 1348 {csn 1808 {cpr 1809 〈cop 1810 |
| This theorem is referenced by: otthg 1900 euop2 1912 opabid 2099 elopab 2110 ssopab2 2119 opbrop 2472 cbvop 2473 dmsn0 2543 dmsnsn0 2544 dmsnop 2547 cnvsn 2636 op2ndb 2638 funsn 2690 fvsn 2879 fsn 2895 tfrlem11 2959 dfoprab2 3021 rnoprab 3033 eloprabg 3035 fo1st 3094 fo2nd 3095 1st2val 3097 brecop 3242 brecop2 3243 ecopoprdm 3245 eceqopreq 3249 th3qlem2 3251 xpsnen 3339 xpcomen 3343 xpassen 3344 xpmapenlem4 3394 xpmapenlem5 3395 enqeceq 3841 addpipq 3848 mulpipq 3849 distrpqlem 3860 enreceq 3971 addsrpr 3978 mulsrpr 3979 addcnsr 4047 mulcnsr 4048 ltresr 4052 supre 4054 addcnsrec 4057 mulcnsrec 4058 axnegex 4078 axrecex 4079 axrnegex 4080 axrrecex 4081 axcnre 4087 seqlem1 4662 seqrval 4664 seq1lem 4668 ruclem6 4890 ruclem7 4891 ruclem13 4897 ruclem15 4899 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 |