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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 4817 | . . . 4 ⊢ (𝑥 = 𝐴 → 〈𝑥, 𝑦〉 = 〈𝐴, 𝑦〉) | |
| 2 | 1 | fveq2d 6840 | . . 3 ⊢ (𝑥 = 𝐴 → (1st ‘〈𝑥, 𝑦〉) = (1st ‘〈𝐴, 𝑦〉)) |
| 3 | id 22 | . . 3 ⊢ (𝑥 = 𝐴 → 𝑥 = 𝐴) | |
| 4 | 2, 3 | eqeq12d 2753 | . 2 ⊢ (𝑥 = 𝐴 → ((1st ‘〈𝑥, 𝑦〉) = 𝑥 ↔ (1st ‘〈𝐴, 𝑦〉) = 𝐴)) |
| 5 | opeq2 4818 | . . 3 ⊢ (𝑦 = 𝐵 → 〈𝐴, 𝑦〉 = 〈𝐴, 𝐵〉) | |
| 6 | 5 | fveqeq2d 6844 | . 2 ⊢ (𝑦 = 𝐵 → ((1st ‘〈𝐴, 𝑦〉) = 𝐴 ↔ (1st ‘〈𝐴, 𝐵〉) = 𝐴)) |
| 7 | vex 3434 | . . 3 ⊢ 𝑥 ∈ V | |
| 8 | vex 3434 | . . 3 ⊢ 𝑦 ∈ V | |
| 9 | 7, 8 | op1st 7945 | . 2 ⊢ (1st ‘〈𝑥, 𝑦〉) = 𝑥 |
| 10 | 4, 6, 9 | vtocl2g 3518 | 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 4574 ‘cfv 6494 1st c1st 7935 |
| 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 2709 ax-sep 5232 ax-nul 5242 ax-pr 5372 ax-un 7684 |
| 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 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5521 df-xp 5632 df-rel 5633 df-cnv 5634 df-co 5635 df-dm 5636 df-rn 5637 df-iota 6450 df-fun 6496 df-fv 6502 df-1st 7937 |
| This theorem is referenced by: ot1stg 7951 ot2ndg 7952 br1steqg 7959 1stconst 8045 mposn 8048 curry2 8052 opco1 8068 mpoxopn0yelv 8158 mpoxopoveq 8164 xpmapenlem 9077 1stinl 9846 1stinr 9848 fpwwe 10564 addpipq 10855 mulpipq 10858 ordpipq 10860 swrdval 14601 ruclem1 16193 qnumdenbi 16709 setsstruct 17141 oppccofval 17677 funcf2 17830 cofuval2 17849 resfval2 17855 resf1st 17856 isnat 17912 fucco 17927 homadm 18002 setcco 18045 estrcco 18091 xpcco 18144 xpchom2 18147 xpcco2 18148 evlf2 18179 curfval 18184 curf1cl 18189 uncf1 18197 uncf2 18198 diag11 18204 diag12 18205 diag2 18206 hof2fval 18216 yonedalem21 18234 yonedalem22 18239 mvmulfval 22521 imasdsf1olem 24352 ovolicc1 25497 ioombl1lem3 25541 ioombl1lem4 25542 addsqnreup 27424 addsval 27972 mulsval 28119 brcgr 28987 opvtxfv 29091 fgreu 32763 fsuppcurry2 32817 erlbrd 33343 rlocaddval 33348 rlocmulval 33349 fracerl 33386 sategoelfvb 35621 prv1n 35633 fvtransport 36234 bj-inftyexpiinv 37542 bj-finsumval0 37619 poimirlem17 37978 poimirlem24 37985 poimirlem27 37988 rngoablo2 38250 dvhopvadd 41559 dvhopvsca 41568 dvhopaddN 41580 dvhopspN 41581 etransclem44 46730 ovnsubaddlem1 47022 ovnlecvr2 47062 ovolval5lem2 47105 gpgedgiov 48559 gpgedg2ov 48560 gpgedg2iv 48561 rngccoALTV 48765 ringccoALTV 48799 func1st 49570 oppf1st2nd 49624 upfval3 49671 swapf1val 49760 fucofval 49812 fuco111 49823 fuco21 49829 fucoid 49841 precofval3 49864 prcofvala 49870 prcofval 49871 lanfval 50106 ranfval 50107 |
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