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Mirrors > Home > MPE Home > Th. List > 1st2nd | Structured version Visualization version GIF version |
Description: Reconstruction of a member of a relation in terms of its ordered pair components. (Contributed by NM, 29-Aug-2006.) |
Ref | Expression |
---|---|
1st2nd | ⊢ ((Rel 𝐵 ∧ 𝐴 ∈ 𝐵) → 𝐴 = 〈(1st ‘𝐴), (2nd ‘𝐴)〉) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-rel 5543 | . . 3 ⊢ (Rel 𝐵 ↔ 𝐵 ⊆ (V × V)) | |
2 | ssel2 3882 | . . 3 ⊢ ((𝐵 ⊆ (V × V) ∧ 𝐴 ∈ 𝐵) → 𝐴 ∈ (V × V)) | |
3 | 1, 2 | sylanb 584 | . 2 ⊢ ((Rel 𝐵 ∧ 𝐴 ∈ 𝐵) → 𝐴 ∈ (V × V)) |
4 | 1st2nd2 7778 | . 2 ⊢ (𝐴 ∈ (V × V) → 𝐴 = 〈(1st ‘𝐴), (2nd ‘𝐴)〉) | |
5 | 3, 4 | syl 17 | 1 ⊢ ((Rel 𝐵 ∧ 𝐴 ∈ 𝐵) → 𝐴 = 〈(1st ‘𝐴), (2nd ‘𝐴)〉) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 = wceq 1543 ∈ wcel 2112 Vcvv 3398 ⊆ wss 3853 〈cop 4533 × cxp 5534 Rel wrel 5541 ‘cfv 6358 1st c1st 7737 2nd c2nd 7738 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2160 ax-12 2177 ax-ext 2708 ax-sep 5177 ax-nul 5184 ax-pr 5307 ax-un 7501 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2073 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2728 df-clel 2809 df-nfc 2879 df-ne 2933 df-ral 3056 df-rex 3057 df-rab 3060 df-v 3400 df-sbc 3684 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-nul 4224 df-if 4426 df-sn 4528 df-pr 4530 df-op 4534 df-uni 4806 df-br 5040 df-opab 5102 df-mpt 5121 df-id 5440 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-iota 6316 df-fun 6360 df-fv 6366 df-1st 7739 df-2nd 7740 |
This theorem is referenced by: 2ndrn 7790 1st2ndbr 7791 funfv1st2nd 7795 funelss 7796 elopabi 7810 cnvf1olem 7856 ordpinq 10522 addassnq 10537 mulassnq 10538 distrnq 10540 mulidnq 10542 recmulnq 10543 ltexnq 10554 fsumcnv 15300 fprodcnv 15508 cofulid 17350 cofurid 17351 idffth 17394 cofull 17395 cofth 17396 ressffth 17399 isnat2 17409 nat1st2nd 17412 homadmcd 17502 catciso 17571 prf1st 17665 prf2nd 17666 1st2ndprf 17667 curfuncf 17700 uncfcurf 17701 curf2ndf 17709 yonffthlem 17744 yoniso 17747 dprd2dlem2 19381 dprd2dlem1 19382 dprd2da 19383 mdetunilem9 21471 2ndcctbss 22306 utop2nei 23102 utop3cls 23103 caubl 24159 wlkop 27669 nvop2 28643 nvvop 28644 nvop 28711 phop 28853 fgreu 30683 1stpreimas 30712 gsumhashmul 30989 cvmliftlem1 32914 heiborlem3 35657 rngoi 35743 drngoi 35795 isdrngo1 35800 iscrngo2 35841 |
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