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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 4065 |
. 2
| |
| 2 | op1st.1 |
. . 3
| |
| 3 | 2 | op1sta 3434 |
. 2
|
| 4 | 1, 3 | eqtr 1487 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: op1stg 4071 1stval2 4073 1st2val 4079 sbcopeq1a 4095 csbopeq1a 4096 dfopab2 4097 dfoprab3 4098 dfoprab4 4100 seq1lem1 6246 ruclem16 7468 ruclem18 7470 ruclem20 7472 xplmi 7907 xplm 7909 xpcn 7910 bcthlem32 7964 nvvcop 8151 cnnvg 8246 cnnvs 8249 h2hva 8782 h2hsm 8783 hhssva 9050 hhsssm 9051 hhshsslem1 9057 eloi 10503 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-9 962 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-sep 2693 ax-nul 2700 ax-pow 2732 ax-pr 2769 ax-un 2857 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-ral 1641 df-rex 1642 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-nul 2271 df-pw 2392 df-sn 2402 df-pr 2403 df-op 2406 df-uni 2494 df-br 2610 df-opab 2657 df-id 2824 df-xp 3174 df-rel 3175 df-cnv 3176 df-co 3177 df-dm 3178 df-rn 3179 df-res 3180 df-ima 3181 df-fun 3182 df-fv 3188 df-1st 4063 |