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| Description: An ordered pair of classes is a set. Exercise 7 of [TakeutiZaring] p. 16. |
| Ref | Expression |
|---|---|
| opex |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-op 2474 |
. 2
| |
| 2 | prex 2857 |
. 2
| |
| 3 | 1, 2 | eqeltri 1587 |
1
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| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: otthg 2866 oteqex 2875 euop2 2883 opabid 2887 elopab 2888 ssopab2 2900 opabn0 2902 elvvv 3314 opbrop 3324 xpnz 3551 dmsnop 3577 cnvsn 3580 opswap 3581 op2ndb 3583 unixp0 3623 funsn 3648 funopg 3652 iunfopab 3719 fvsn 3906 fsn 3948 dfoprab2 4050 rnoprab 4064 eloprabg 4067 fo1st 4152 fo2nd 4153 fparlem1 4199 fparlem2 4200 fparlem3 4201 fparlem4 4202 fpar 4203 tfrlem11 4222 brecop 4447 brecop2 4448 ecopoprdm 4450 eceqopreq 4454 th3qlem2 4456 xpsnen 4576 xpcomen 4580 xpassen 4582 ac6sfilem3 4590 xpmapenlem4 4646 xpmapenlem5 4647 enqeceq 5201 addpipq 5208 mulpipq 5209 distrpqlem 5220 enreceq 5331 addsrpr 5338 mulsrpr 5339 addcnsr 5407 mulcnsr 5408 ltresr 5412 supre 5414 addcnsrec 5417 mulcnsrec 5418 axrnegex 5437 axrrecex 5438 axcnre 5440 ltxr 5649 seq1lem1 6674 seq1rval 6676 seq11lem 6680 seqzfval 6732 ruclem6 7727 ruclem7 7728 ruclem8 7729 ruclem15 7736 xplmi 8184 xplm 8186 xpcn 8187 oprcn 8188 grpsn 8273 ringsn 8405 nvvcop 8460 nvex 8477 nvoprne 8553 cnnvg 8555 cnnvs 8558 cnnvnm 8559 abscn 8597 h2hva 9118 h2hsm 9119 h2hnm 9120 hhssva 9405 hhsssm 9406 hhssnm 9407 hhshsslem1 9413 hhsssh2 9416 ghomsn 10673 elo 10733 stcat 10741 eloi 10817 on1el3 10962 on1el4 10963 zrdivrng 10969 1alg 11176 1ded 11192 1cat 11213 extrdom 11236 extrcod 11237 extrcmp 11238 extrid 11239 hartog 11436 filnetlem1 11763 filnetlem3 11765 filnetlem5 11767 filnet 11768 ssga 11777 gapmlem 11783 gapm 11784 oprabopabf 11807 upxp 11822 uptx 11978 txcnopab 11980 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 998 ax-gen 999 ax-8 1000 ax-10 1002 ax-11 1003 ax-12 1004 ax-13 1005 ax-14 1006 ax-17 1007 ax-4 1009 ax-5o 1011 ax-6o 1014 ax-9o 1159 ax-10o 1177 ax-16 1247 ax-11o 1255 ax-ext 1500 ax-sep 2777 ax-pow 2818 ax-pr 2855 |
| This theorem depends on definitions: df-bi 145 df-or 222 df-an 223 df-ex 1017 df-sb 1209 df-eu 1421 df-mo 1422 df-clab 1506 df-cleq 1511 df-clel 1514 df-ne 1630 df-v 1858 df-dif 2101 df-un 2102 df-in 2103 df-ss 2105 df-nul 2333 df-pw 2459 df-sn 2470 df-pr 2471 df-op 2474 |