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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 6583 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → Fun {〈𝐴, 𝐵〉}) | |
| 2 | opex 5432 | . . 3 ⊢ 〈𝐴, 𝐵〉 ∈ V | |
| 3 | 2 | snid 4623 | . 2 ⊢ 〈𝐴, 𝐵〉 ∈ {〈𝐴, 𝐵〉} |
| 4 | funopfv 6926 | . 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 4584 〈cop 4590 Fun wfun 6525 ‘cfv 6531 |
| 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 2213 ax-ext 2733 ax-sep 5249 ax-pr 5391 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-id 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-iota 6487 df-fun 6533 df-fv 6539 |
| This theorem is used by: fvsn 7178 fvsnun1 7179 fsnunfv 7184 fvpr1g 7187 fsnex 7283 suppsnop 8179 mapsnend 9048 enfixsn 9089 axdc3lem4 10512 fseq1p1m1 13712 1fv 13761 s1fv 14738 sumsnf 15889 prodsn 16109 prodsnf 16111 seq1st 16726 vdwlem8 17146 setsid 17365 mgm1 18816 sgrp1 18898 mnd1 18953 mnd1id 18954 gsumws1 19014 grp1 19237 dprdsn 20232 ring1 20521 ixpsnbasval 21463 frgpcyg 21859 mat1dimscm 22770 mat1dimmul 22771 mat1rhmelval 22775 m1detdiag 22892 pt1hmeo 24105 noextenddif 28007 noextendlt 28008 noextendgt 28009 1loopgrvd0 30067 1hevtxdg0 30068 1hevtxdg1 30069 1egrvtxdg1 30072 wlkl0 30950 0mplrim 34128 selvply1rhmlemb 34133 actfunsnrndisj 35217 reprsuc 35227 breprexplema 35242 cvmliftlem7 36025 cvmliftlem13 36030 bj-fununsn2 38143 sticksstones9 43172 sticksstones11 43174 frlmsnic 43566 sumsnd 45986 ovnovollem1 47610 nnsum3primesprm 48832 lincvalsng 49472 snlindsntorlem 49526 lmod1lem2 49544 lmod1lem3 49545 0aryfvalelfv 49691 1arympt1fv 49695 ovsng 49912 |
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