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| Description: Extract the first member of an ordered pair. |
| Ref | Expression |
|---|---|
| op1st.1 |
|
| Ref | Expression |
|---|---|
| op1st |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1stval 4142 |
. 2
| |
| 2 | op1st.1 |
. . 3
| |
| 3 | 2 | op1sta 3579 |
. 2
|
| 4 | 1, 3 | eqtri 1538 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: op1stg 4148 1stval2 4150 fo1stres 4156 1st2val 4158 sbcopeq1a 4171 csbopeq1a 4172 dfopab2 4173 dfoprab3 4174 dfoprab5s 4177 df1st2 4188 1stconst 4190 curry2 4196 fparlem1 4199 fsplit 4204 seq1lem1 6674 ruclem16 7737 ruclem18 7739 ruclem20 7741 xplmi 8184 xplm 8186 xpcn 8187 bcthlem32 8241 nvvcop 8460 nvoprne 8553 cnnvg 8555 cnnvs 8558 h2hva 9118 h2hsm 9119 hhssva 9405 hhsssm 9406 hhshsslem1 9413 hhsssh2 9416 prj1 10809 eloi 10817 fora1 10952 on1el3 10962 on1el4 10963 extrdom 11236 extrcod 11237 2ndcctbss 11539 filnetlem5 11767 filnet 11768 xp1st 11796 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-9 1001 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-nul 2784 ax-pow 2818 ax-pr 2855 ax-un 3089 |
| 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-ral 1695 df-rex 1696 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 df-uni 2570 df-br 2693 df-opab 2741 df-id 2913 df-xp 3265 df-rel 3266 df-cnv 3267 df-co 3268 df-dm 3269 df-rn 3270 df-res 3271 df-ima 3272 df-fun 3273 df-fv 3279 df-1st 4140 |