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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 4832 | . . . 4 ⊢ (𝑥 = 𝐴 → 〈𝑥, 𝑦〉 = 〈𝐴, 𝑦〉) | |
| 2 | 1 | fveq2d 6889 | . . 3 ⊢ (𝑥 = 𝐴 → (1st ‘〈𝑥, 𝑦〉) = (1st ‘〈𝐴, 𝑦〉)) |
| 3 | id 23 | . . 3 ⊢ (𝑥 = 𝐴 → 𝑥 = 𝐴) | |
| 4 | 2, 3 | eqeq12d 2776 | . 2 ⊢ (𝑥 = 𝐴 → ((1st ‘〈𝑥, 𝑦〉) = 𝑥 ↔ (1st ‘〈𝐴, 𝑦〉) = 𝐴)) |
| 5 | opeq2 4833 | . . 3 ⊢ (𝑦 = 𝐵 → 〈𝐴, 𝑦〉 = 〈𝐴, 𝐵〉) | |
| 6 | 5 | fveqeq2d 6893 | . 2 ⊢ (𝑦 = 𝐵 → ((1st ‘〈𝐴, 𝑦〉) = 𝐴 ↔ (1st ‘〈𝐴, 𝐵〉) = 𝐴)) |
| 7 | vex 3454 | . . 3 ⊢ 𝑥 ∈ V | |
| 8 | vex 3454 | . . 3 ⊢ 𝑦 ∈ V | |
| 9 | 7, 8 | op1st 8009 | . 2 ⊢ (1st ‘〈𝑥, 𝑦〉) = 𝑥 |
| 10 | 4, 6, 9 | vtocl2g 3533 | 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 1569 ∈ wcel 2144 〈cop 4589 ‘cfv 6538 1st c1st 7999 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 ax-un 7751 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5545 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-iota 6494 df-fun 6540 df-fv 6546 df-1st 8001 |
| This theorem is used by: ot1stg 8015 ot2ndg 8016 br1steqg 8023 1stconst 8111 mposn 8114 curry2 8118 opco1 8134 mpoxopn0yelv 8230 mpoxopoveq 8236 xpmapenlem 9163 1stinl 10008 1stinr 10010 fpwwe 10731 addpipq 11022 mulpipq 11025 ordpipq 11027 swrdval 14791 ruclem1 16399 qnumdenbi 16920 setsstruct 17354 oppccofval 17890 funcf2 18043 cofuval2 18062 resfval2 18068 resf1st 18069 isnat 18125 fucco 18140 homadm 18215 setcco 18258 estrcco 18304 xpcco 18357 xpchom2 18360 xpcco2 18361 evlf2 18392 curfval 18397 curf1cl 18402 uncf1 18410 uncf2 18411 diag11 18417 diag12 18418 diag2 18419 hof2fval 18429 yonedalem21 18447 yonedalem22 18452 mvmulfval 22857 imasdsf1olem 24692 ovolicc1 25837 ioombl1lem3 25881 ioombl1lem4 25882 addsqnreup 27770 addsval 28348 mulsval 28495 brcgr 29478 opvtxfv 29582 fgreu 33265 fsuppcurry2 33317 erlbrd 33824 erld2 33827 rlocaddval 33830 rlocmulval 33831 fracerl 33868 sategoelfvb 36184 prv1n 36196 fvtransport 36797 bj-inftyexpiinv 38130 bj-finsumval0 38207 poimirlem17 38556 poimirlem24 38563 poimirlem27 38566 rngoablo2 38844 dvhopvadd 42151 dvhopvsca 42160 dvhopaddN 42172 dvhopspN 42173 etransclem44 47288 ovnsubaddlem1 47580 ovnlecvr2 47620 ovolval5lem2 47663 gpgedgiov 49163 gpgedg2ov 49164 gpgedg2iv 49165 rngccoALTV 49368 ringccoALTV 49402 func1st 50185 oppf1st2nd 50239 upfval3 50286 swapf1val 50375 fucofval 50427 fuco111 50438 fuco21 50444 fucoid 50456 precofval3 50479 prcofvala 50485 prcofval 50486 lanfval 50721 ranfval 50722 |
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