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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 2421 |
. 2
| |
| 2 | prex 2788 |
. 2
| |
| 3 | 1, 2 | eqeltr 1547 |
1
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| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: otthg 2797 oteqex 2806 euop2 2813 opabid 2817 elopab 2818 ssopab2 2829 opabn0 2831 opbrop 3245 dmsn0 3331 dmsnsn0 3332 dmsnop 3335 cnvsn 3456 op2ndb 3458 xpnz 3473 unixp0 3525 funsn 3550 funopg 3554 fvsn 3801 fsn 3841 tfrlem11 3928 dfoprab2 3998 rnoprab 4011 eloprabg 4014 fo1st 4098 fo2nd 4099 1st2val 4102 2nd2val 4103 2ndconst 4104 brecop 4313 brecop2 4314 ecopoprdm 4316 eceqopreq 4320 th3qlem2 4322 xpsnen 4442 xpcomen 4446 xpassen 4448 xpmapenlem4 4506 xpmapenlem5 4507 enqeceq 5066 addpipq 5073 mulpipq 5074 distrpqlem 5085 enreceq 5196 addsrpr 5203 mulsrpr 5204 addcnsr 5272 mulcnsr 5273 ltresr 5277 supre 5279 addcnsrec 5282 mulcnsrec 5283 axrnegex 5302 axrrecex 5303 axcnre 5305 ltxrt 5514 seq1lem1 6317 seq1rval 6319 seq11lem 6323 seqzfval 6545 ruclem6 7523 ruclem7 7524 ruclem8 7525 ruclem15 7532 xplmi 7977 xplm 7979 xpcn 7980 oprcn 7981 grpsn 8127 ringsn 8166 nvvcop 8216 nvex 8233 nvoprne 8309 cnnvg 8311 cnnvs 8314 cnnvnm 8315 abscn 8346 h2hva 8845 h2hsm 8846 h2hnm 8847 hhssva 9131 hhsssm 9132 hhssnm 9133 hhshsslem1 9139 hhsssh2 9142 ghomsn 10391 elo 10447 stcat 10455 1alg 10633 eloi 10638 1ded 10650 1cat 10671 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-sep 2709 ax-pow 2749 ax-pr 2786 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-v 1815 df-dif 2053 df-un 2054 df-in 2055 df-ss 2057 df-nul 2285 df-pw 2407 df-sn 2417 df-pr 2418 df-op 2421 |