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| Mirrors > Home > MPE Home > Th. List > fvsng | Structured version Visualization version GIF version | ||
| Description: The value of a singleton of an ordered pair is the second member. (Contributed by NM, 26-Oct-2012.) (Proof shortened by BJ, 25-Feb-2023.) |
| Ref | Expression |
|---|---|
| fvsng | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({〈𝐴, 𝐵〉}‘𝐴) = 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | funsng 6588 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → Fun {〈𝐴, 𝐵〉}) | |
| 2 | opex 5443 | . . 3 ⊢ 〈𝐴, 𝐵〉 ∈ V | |
| 3 | 2 | snid 4626 | . 2 ⊢ 〈𝐴, 𝐵〉 ∈ {〈𝐴, 𝐵〉} |
| 4 | funopfv 6931 | . 2 ⊢ (Fun {〈𝐴, 𝐵〉} → (〈𝐴, 𝐵〉 ∈ {〈𝐴, 𝐵〉} → ({〈𝐴, 𝐵〉}‘𝐴) = 𝐵)) | |
| 5 | 1, 3, 4 | mpisyl 22 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({〈𝐴, 𝐵〉}‘𝐴) = 𝐵) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 {csn 4587 〈cop 4593 Fun wfun 6531 ‘cfv 6537 |
| 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-12 2215 ax-ext 2734 ax-sep 5255 ax-pr 5402 |
| 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-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-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-iota 6493 df-fun 6539 df-fv 6545 |
| This theorem is used by: fvsn 7183 fvsnun1 7184 fsnunfv 7189 fvpr1g 7192 fsnex 7288 suppsnop 8180 mapsnend 9047 enfixsn 9088 axdc3lem4 10459 fseq1p1m1 13657 1fv 13706 s1fv 14682 sumsnf 15833 prodsn 16055 prodsnf 16057 seq1st 16667 vdwlem8 17086 setsid 17305 mgm1 18756 sgrp1 18837 mnd1 18892 mnd1id 18893 gsumws1 18953 grp1 19176 dprdsn 20171 ring1 20458 ixpsnbasval 21398 frgpcyg 21792 mat1dimscm 22703 mat1dimmul 22704 mat1rhmelval 22708 m1detdiag 22825 pt1hmeo 24038 noextenddif 27912 noextendlt 27913 noextendgt 27914 1loopgrvd0 29972 1hevtxdg0 29973 1hevtxdg1 29974 1egrvtxdg1 29977 wlkl0 30855 0mplrim 34032 selvply1rhmlemb 34037 actfunsnrndisj 35121 reprsuc 35131 breprexplema 35146 cvmliftlem7 35878 cvmliftlem13 35883 bj-fununsn2 38014 sticksstones9 43028 sticksstones11 43030 frlmsnic 43430 sumsnd 45868 ovnovollem1 47492 nnsum3primesprm 48714 lincvalsng 49354 snlindsntorlem 49408 lmod1lem2 49426 lmod1lem3 49427 0aryfvalelfv 49573 1arympt1fv 49577 ovsng 49794 |
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