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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 4071 |
. 2
| |
| 2 | op1st.1 |
. . 3
| |
| 3 | 2 | op1sta 3440 |
. 2
|
| 4 | 1, 3 | eqtr 1492 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: op1stg 4077 1stval2 4079 1st2val 4085 sbcopeq1a 4101 csbopeq1a 4102 dfopab2 4103 dfoprab3 4104 dfoprab4 4106 seq1lem1 6254 ruclem16 7476 ruclem18 7478 ruclem20 7480 xplmi 7923 xplm 7925 xpcn 7926 bcthlem32 7980 nvvcop 8165 cnnvg 8259 cnnvs 8262 h2hva 8782 h2hsm 8783 hhssva 9068 hhsssm 9069 hhshsslem1 9076 hhsssh2 9079 eloi 10539 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-9 963 ax-10 964 ax-11 965 ax-12 966 ax-13 967 ax-14 968 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 ax-sep 2698 ax-nul 2705 ax-pow 2737 ax-pr 2774 ax-un 2861 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 979 df-sb 1170 df-eu 1380 df-mo 1381 df-clab 1462 df-cleq 1467 df-clel 1470 df-ne 1584 df-ral 1646 df-rex 1647 df-v 1808 df-dif 2045 df-un 2046 df-in 2047 df-ss 2049 df-nul 2277 df-pw 2398 df-sn 2408 df-pr 2409 df-op 2412 df-uni 2499 df-br 2615 df-opab 2662 df-id 2830 df-xp 3179 df-rel 3180 df-cnv 3181 df-co 3182 df-dm 3183 df-rn 3184 df-res 3185 df-ima 3186 df-fun 3187 df-fv 3193 df-1st 4069 |