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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 7050 | . 2 ⊢ (𝐹 Fn 𝐴 → (𝐶 ∈ (◡𝐹 “ {𝐵}) ↔ (𝐶 ∈ 𝐴 ∧ (𝐹‘𝐶) ∈ {𝐵}))) | |
| 2 | fvex 6891 | . . . 4 ⊢ (𝐹‘𝐶) ∈ V | |
| 3 | 2 | elsn 4599 | . . 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 2145 {csn 4584 ◡ccnv 5654 “ cima 5658 Fn wfn 6528 ‘cfv 6533 |
| 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 2732 ax-sep 5251 ax-nul 5263 ax-pr 5398 |
| 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 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 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 5550 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-iota 6489 df-fun 6535 df-fn 6536 df-fv 6541 |
| This theorem is used by: fparlem1 8109 fparlem2 8110 pw2f1olem 9079 recmulnq 10973 dmrecnq 10977 indpi1 12256 vdwlem1 17073 vdwlem2 17074 vdwlem6 17078 vdwlem8 17080 vdwlem9 17081 vdwlem12 17084 vdwlem13 17085 ramval 17100 ramub1lem1 17118 ghmeqker 19370 ghmqusnsglem1 19407 ghmquskerlem1 19410 ghmqusker 19414 efgrelexlemb 19877 efgredeu 19879 psgnevpmb 21800 qtopeu 23942 itg1addlem1 25920 i1faddlem 25921 i1fmullem 25922 i1fmulclem 25930 i1fres 25933 itg10a 25938 itg1ge0a 25939 itg1climres 25942 mbfi1fseqlem4 25946 ply1remlem 26390 ply1rem 26391 fta1glem1 26393 fta1glem2 26394 fta1g 26395 fta1blem 26396 plyco0 26417 ofmulrt 26509 plyremlem 26534 plyrem 26535 fta1lem 26537 fta1 26538 rnplynfin 26539 plyconz 26540 vieta1lem1 26542 vieta1lem2 26543 vieta1 26544 plyexmo 26545 elaa 26548 aannenlem1 26564 aalioulem2 26569 pilem1 26687 efif1olem3 26781 efif1olem4 26782 efifo 26784 eff1olem 26785 basellem4 27320 lgsqrlem2 27583 lgsqrlem3 27584 rpvmasum2 27748 dirith 27765 foresf1o 32979 ofpreima 33138 fnpreimac 33143 1stpreimas 33178 indpreima 33311 s3clhash 33391 pwrssmgc 33440 cycpmconjslem2 33595 cyc3conja 33597 exsslsb 34107 dimkerim 34137 elirng 34196 irngss 34197 irngnzply1 34201 locfinreflem 34350 qqhre 34530 sibfof 34851 cvmliftlem6 35869 cvmliftlem7 35870 cvmliftlem8 35871 cvmliftlem9 35872 taupilem3 38071 itg2addnclem 38420 itg2addnclem2 38421 pw2f1o2val2 43881 dnnumch3 43888 proot1mul 44035 proot1hash 44036 proot1ex 44037 wessf1ornlem 46017 preimafvsnel 48279 uniimaprimaeqfv 48282 elsetpreimafvbi 48291 imasubc 50077 imassc 50079 imaid 50080 |
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