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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 4836 | . . . 4 ⊢ (𝑥 = 𝐴 → 〈𝑥, 𝑦〉 = 〈𝐴, 𝑦〉) | |
| 2 | 1 | fveq2d 6886 | . . 3 ⊢ (𝑥 = 𝐴 → (1st ‘〈𝑥, 𝑦〉) = (1st ‘〈𝐴, 𝑦〉)) |
| 3 | id 23 | . . 3 ⊢ (𝑥 = 𝐴 → 𝑥 = 𝐴) | |
| 4 | 2, 3 | eqeq12d 2778 | . 2 ⊢ (𝑥 = 𝐴 → ((1st ‘〈𝑥, 𝑦〉) = 𝑥 ↔ (1st ‘〈𝐴, 𝑦〉) = 𝐴)) |
| 5 | opeq2 4837 | . . 3 ⊢ (𝑦 = 𝐵 → 〈𝐴, 𝑦〉 = 〈𝐴, 𝐵〉) | |
| 6 | 5 | fveqeq2d 6890 | . 2 ⊢ (𝑦 = 𝐵 → ((1st ‘〈𝐴, 𝑦〉) = 𝐴 ↔ (1st ‘〈𝐴, 𝐵〉) = 𝐴)) |
| 7 | vex 3457 | . . 3 ⊢ 𝑥 ∈ V | |
| 8 | vex 3457 | . . 3 ⊢ 𝑦 ∈ V | |
| 9 | 7, 8 | op1st 7997 | . 2 ⊢ (1st ‘〈𝑥, 𝑦〉) = 𝑥 |
| 10 | 4, 6, 9 | vtocl2g 3536 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (1st ‘〈𝐴, 𝐵〉) = 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 〈cop 4593 ‘cfv 6537 1st c1st 7987 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pr 5402 ax-un 7739 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-rab 3415 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-br 5108 df-opab 5172 df-mpt 5191 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-iota 6493 df-fun 6539 df-fv 6545 df-1st 7989 |
| This theorem is used by: ot1stg 8003 ot2ndg 8004 br1steqg 8011 1stconst 8100 mposn 8103 curry2 8107 opco1 8123 mpoxopn0yelv 8214 mpoxopoveq 8220 xpmapenlem 9145 1stinl 9935 1stinr 9937 fpwwe 10658 addpipq 10949 mulpipq 10952 ordpipq 10954 swrdval 14713 ruclem1 16323 qnumdenbi 16839 setsstruct 17272 oppccofval 17808 funcf2 17961 cofuval2 17980 resfval2 17986 resf1st 17987 isnat 18043 fucco 18058 homadm 18133 setcco 18176 estrcco 18222 xpcco 18275 xpchom2 18278 xpcco2 18279 evlf2 18310 curfval 18315 curf1cl 18320 uncf1 18328 uncf2 18329 diag11 18335 diag12 18336 diag2 18337 hof2fval 18347 yonedalem21 18365 yonedalem22 18370 mvmulfval 22765 imasdsf1olem 24600 ovolicc1 25745 ioombl1lem3 25789 ioombl1lem4 25790 addsqnreup 27677 addsval 28225 mulsval 28372 brcgr 29343 opvtxfv 29447 fgreu 33131 fsuppcurry2 33183 erlbrd 33690 erld2 33693 rlocaddval 33696 rlocmulval 33697 fracerl 33734 sategoelfvb 35985 prv1n 35997 fvtransport 36599 bj-inftyexpiinv 37947 bj-finsumval0 38024 poimirlem17 38373 poimirlem24 38380 poimirlem27 38383 rngoablo2 38646 dvhopvadd 41953 dvhopvsca 41962 dvhopaddN 41974 dvhopspN 41975 etransclem44 47093 ovnsubaddlem1 47385 ovnlecvr2 47425 ovolval5lem2 47468 gpgedgiov 48968 gpgedg2ov 48969 gpgedg2iv 48970 rngccoALTV 49173 ringccoALTV 49207 func1st 49990 oppf1st2nd 50044 upfval3 50091 swapf1val 50180 fucofval 50232 fuco111 50243 fuco21 50249 fucoid 50261 precofval3 50284 prcofvala 50290 prcofval 50291 lanfval 50526 ranfval 50527 |
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