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| Mirrors > Home > MPE Home > Th. List > op1stg | Structured version Visualization version GIF version | ||
| Description: Extract the first member of an ordered pair. (Contributed by NM, 19-Jul-2005.) |
| Ref | Expression |
|---|---|
| op1stg | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (1st ‘〈𝐴, 𝐵〉) = 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opeq1 4816 | . . . 4 ⊢ (𝑥 = 𝐴 → 〈𝑥, 𝑦〉 = 〈𝐴, 𝑦〉) | |
| 2 | 1 | fveq2d 6844 | . . 3 ⊢ (𝑥 = 𝐴 → (1st ‘〈𝑥, 𝑦〉) = (1st ‘〈𝐴, 𝑦〉)) |
| 3 | id 22 | . . 3 ⊢ (𝑥 = 𝐴 → 𝑥 = 𝐴) | |
| 4 | 2, 3 | eqeq12d 2752 | . 2 ⊢ (𝑥 = 𝐴 → ((1st ‘〈𝑥, 𝑦〉) = 𝑥 ↔ (1st ‘〈𝐴, 𝑦〉) = 𝐴)) |
| 5 | opeq2 4817 | . . 3 ⊢ (𝑦 = 𝐵 → 〈𝐴, 𝑦〉 = 〈𝐴, 𝐵〉) | |
| 6 | 5 | fveqeq2d 6848 | . 2 ⊢ (𝑦 = 𝐵 → ((1st ‘〈𝐴, 𝑦〉) = 𝐴 ↔ (1st ‘〈𝐴, 𝐵〉) = 𝐴)) |
| 7 | vex 3433 | . . 3 ⊢ 𝑥 ∈ V | |
| 8 | vex 3433 | . . 3 ⊢ 𝑦 ∈ V | |
| 9 | 7, 8 | op1st 7950 | . 2 ⊢ (1st ‘〈𝑥, 𝑦〉) = 𝑥 |
| 10 | 4, 6, 9 | vtocl2g 3517 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (1st ‘〈𝐴, 𝐵〉) = 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∈ wcel 2114 〈cop 4573 ‘cfv 6498 1st c1st 7940 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pr 5375 ax-un 7689 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3062 df-rab 3390 df-v 3431 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-br 5086 df-opab 5148 df-mpt 5167 df-id 5526 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-iota 6454 df-fun 6500 df-fv 6506 df-1st 7942 |
| This theorem is referenced by: ot1stg 7956 ot2ndg 7957 br1steqg 7964 1stconst 8050 mposn 8053 curry2 8057 opco1 8073 mpoxopn0yelv 8163 mpoxopoveq 8169 xpmapenlem 9082 1stinl 9851 1stinr 9853 fpwwe 10569 addpipq 10860 mulpipq 10863 ordpipq 10865 swrdval 14606 ruclem1 16198 qnumdenbi 16714 setsstruct 17146 oppccofval 17682 funcf2 17835 cofuval2 17854 resfval2 17860 resf1st 17861 isnat 17917 fucco 17932 homadm 18007 setcco 18050 estrcco 18096 xpcco 18149 xpchom2 18152 xpcco2 18153 evlf2 18184 curfval 18189 curf1cl 18194 uncf1 18202 uncf2 18203 diag11 18209 diag12 18210 diag2 18211 hof2fval 18221 yonedalem21 18239 yonedalem22 18244 mvmulfval 22507 imasdsf1olem 24338 ovolicc1 25483 ioombl1lem3 25527 ioombl1lem4 25528 addsqnreup 27406 addsval 27954 mulsval 28101 brcgr 28969 opvtxfv 29073 fgreu 32744 fsuppcurry2 32798 erlbrd 33324 rlocaddval 33329 rlocmulval 33330 fracerl 33367 sategoelfvb 35601 prv1n 35613 fvtransport 36214 bj-inftyexpiinv 37522 bj-finsumval0 37599 poimirlem17 37958 poimirlem24 37965 poimirlem27 37968 rngoablo2 38230 dvhopvadd 41539 dvhopvsca 41548 dvhopaddN 41560 dvhopspN 41561 etransclem44 46706 ovnsubaddlem1 46998 ovnlecvr2 47038 ovolval5lem2 47081 gpgedgiov 48541 gpgedg2ov 48542 gpgedg2iv 48543 rngccoALTV 48747 ringccoALTV 48781 func1st 49552 oppf1st2nd 49606 upfval3 49653 swapf1val 49742 fucofval 49794 fuco111 49805 fuco21 49811 fucoid 49823 precofval3 49846 prcofvala 49852 prcofval 49853 lanfval 50088 ranfval 50089 |
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