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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 2416 |
. 2
| |
| 2 | prex 2781 |
. 2
| |
| 3 | 1, 2 | eqeltr 1544 |
1
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| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: otthg 2790 oteqex 2799 euop2 2806 opabid 2810 elopab 2811 ssopab2 2822 opabn0 2824 opbrop 3238 dmsn0 3324 dmsnsn0 3325 dmsnop 3328 cnvsn 3449 op2ndb 3451 xpnz 3466 unixp0 3518 funsn 3543 funopg 3547 fvsn 3794 fsn 3834 tfrlem11 3921 dfoprab2 3991 rnoprab 4004 eloprabg 4007 fo1st 4091 fo2nd 4092 1st2val 4095 2nd2val 4096 2ndconst 4097 brecop 4306 brecop2 4307 ecopoprdm 4309 eceqopreq 4313 th3qlem2 4315 xpsnen 4435 xpcomen 4439 xpassen 4441 xpmapenlem4 4499 xpmapenlem5 4500 enqeceq 5047 addpipq 5054 mulpipq 5055 distrpqlem 5066 enreceq 5177 addsrpr 5184 mulsrpr 5185 addcnsr 5253 mulcnsr 5254 ltresr 5258 supre 5260 addcnsrec 5263 mulcnsrec 5264 axrnegex 5283 axrrecex 5284 axcnre 5286 ltxrt 5495 seq1lem1 6309 seq1rval 6311 seq11lem 6315 seqzfval 6537 ruclem6 7515 ruclem7 7516 ruclem8 7517 ruclem15 7524 xplmi 7973 xplm 7975 xpcn 7976 oprcn 7977 grpsn 8124 ringsn 8163 nvvcop 8213 nvex 8230 nvoprne 8306 cnnvg 8308 cnnvs 8311 cnnvnm 8312 abscn 8343 h2hva 8843 h2hsm 8844 h2hnm 8845 hhssva 9129 hhsssm 9130 hhssnm 9131 hhshsslem1 9137 hhsssh2 9140 ghomsn 10388 elo 10444 stcat 10457 1alg 10654 eloi 10659 1ded 10671 1cat 10692 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-10 966 ax-11 967 ax-12 968 ax-13 969 ax-14 970 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2703 ax-pow 2742 ax-pr 2779 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 981 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1587 df-v 1812 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-pw 2402 df-sn 2412 df-pr 2413 df-op 2416 |