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| Mirrors > Home > MPE Home > Th. List > fniniseg | Structured version Visualization version GIF version | ||
| Description: Membership in the preimage of a singleton, under a function. (Contributed by Mario Carneiro, 12-May-2014.) (Proof shortened by Mario Carneiro , 28-Apr-2015.) |
| Ref | Expression |
|---|---|
| fniniseg | ⊢ (𝐹 Fn 𝐴 → (𝐶 ∈ (◡𝐹 “ {𝐵}) ↔ (𝐶 ∈ 𝐴 ∧ (𝐹‘𝐶) = 𝐵))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elpreima 7057 | . 2 ⊢ (𝐹 Fn 𝐴 → (𝐶 ∈ (◡𝐹 “ {𝐵}) ↔ (𝐶 ∈ 𝐴 ∧ (𝐹‘𝐶) ∈ {𝐵}))) | |
| 2 | fvex 6898 | . . . 4 ⊢ (𝐹‘𝐶) ∈ V | |
| 3 | 2 | elsn 4606 | . . 3 ⊢ ((𝐹‘𝐶) ∈ {𝐵} ↔ (𝐹‘𝐶) = 𝐵) |
| 4 | 3 | anbi2i 635 | . 2 ⊢ ((𝐶 ∈ 𝐴 ∧ (𝐹‘𝐶) ∈ {𝐵}) ↔ (𝐶 ∈ 𝐴 ∧ (𝐹‘𝐶) = 𝐵)) |
| 5 | 1, 4 | bitrdi 290 | 1 ⊢ (𝐹 Fn 𝐴 → (𝐶 ∈ (◡𝐹 “ {𝐵}) ↔ (𝐶 ∈ 𝐴 ∧ (𝐹‘𝐶) = 𝐵))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2146 {csn 4591 ◡ccnv 5662 “ cima 5666 Fn wfn 6535 ‘cfv 6540 |
| 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 2148 ax-9 2156 ax-10 2179 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pr 5406 |
| 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 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-ne 2961 df-ral 3082 df-rex 3092 df-rab 3419 df-v 3459 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-br 5112 df-opab 5176 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-iota 6496 df-fun 6542 df-fn 6543 df-fv 6548 |
| This theorem is used by: fparlem1 8113 fparlem2 8114 pw2f1olem 9076 recmulnq 10964 dmrecnq 10968 indpi1 12247 vdwlem1 17063 vdwlem2 17064 vdwlem6 17068 vdwlem8 17070 vdwlem9 17071 vdwlem12 17074 vdwlem13 17075 ramval 17090 ramub1lem1 17108 ghmeqker 19357 ghmqusnsglem1 19394 ghmquskerlem1 19397 ghmqusker 19401 efgrelexlemb 19864 efgredeu 19866 psgnevpmb 21787 qtopeu 23924 itg1addlem1 25902 i1faddlem 25903 i1fmullem 25904 i1fmulclem 25912 i1fres 25915 itg10a 25920 itg1ge0a 25921 itg1climres 25924 mbfi1fseqlem4 25928 ply1remlem 26373 ply1rem 26374 fta1glem1 26376 fta1glem2 26377 fta1g 26378 fta1blem 26379 plyco0 26400 ofmulrt 26491 plyremlem 26516 plyrem 26517 fta1lem 26519 fta1 26520 vieta1lem1 26522 vieta1lem2 26523 vieta1 26524 plyexmo 26525 elaa 26528 aannenlem1 26542 aalioulem2 26547 pilem1 26665 efif1olem3 26760 efif1olem4 26761 efifo 26763 eff1olem 26764 basellem4 27299 lgsqrlem2 27562 lgsqrlem3 27563 rpvmasum2 27727 dirith 27744 foresf1o 32921 ofpreima 33081 fnpreimac 33086 1stpreimas 33122 indpreima 33255 s3clhash 33335 pwrssmgc 33384 cycpmconjslem2 33539 cyc3conja 33541 exsslsb 34051 dimkerim 34081 elirng 34140 irngss 34141 irngnzply1 34145 locfinreflem 34294 qqhre 34474 sibfof 34795 cvmliftlem6 35819 cvmliftlem7 35820 cvmliftlem8 35821 cvmliftlem9 35822 taupilem3 38020 itg2addnclem 38379 itg2addnclem2 38380 pw2f1o2val2 43825 dnnumch3 43832 proot1mul 43979 proot1hash 43980 proot1ex 43981 wessf1ornlem 45961 preimafvsnel 48186 uniimaprimaeqfv 48189 elsetpreimafvbi 48198 imasubc 49986 imassc 49988 imaid 49989 |
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