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Mirrors > Home > MPE Home > Th. List > fnsnfv | Structured version Visualization version GIF version |
Description: Singleton of function value. (Contributed by NM, 22-May-1998.) |
Ref | Expression |
---|---|
fnsnfv | ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → {(𝐹‘𝐵)} = (𝐹 “ {𝐵})) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqcom 2629 | . . . 4 ⊢ (𝑦 = (𝐹‘𝐵) ↔ (𝐹‘𝐵) = 𝑦) | |
2 | fnbrfvb 6236 | . . . 4 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → ((𝐹‘𝐵) = 𝑦 ↔ 𝐵𝐹𝑦)) | |
3 | 1, 2 | syl5bb 272 | . . 3 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → (𝑦 = (𝐹‘𝐵) ↔ 𝐵𝐹𝑦)) |
4 | 3 | abbidv 2741 | . 2 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → {𝑦 ∣ 𝑦 = (𝐹‘𝐵)} = {𝑦 ∣ 𝐵𝐹𝑦}) |
5 | df-sn 4178 | . . 3 ⊢ {(𝐹‘𝐵)} = {𝑦 ∣ 𝑦 = (𝐹‘𝐵)} | |
6 | 5 | a1i 11 | . 2 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → {(𝐹‘𝐵)} = {𝑦 ∣ 𝑦 = (𝐹‘𝐵)}) |
7 | fnrel 5989 | . . . 4 ⊢ (𝐹 Fn 𝐴 → Rel 𝐹) | |
8 | relimasn 5488 | . . . 4 ⊢ (Rel 𝐹 → (𝐹 “ {𝐵}) = {𝑦 ∣ 𝐵𝐹𝑦}) | |
9 | 7, 8 | syl 17 | . . 3 ⊢ (𝐹 Fn 𝐴 → (𝐹 “ {𝐵}) = {𝑦 ∣ 𝐵𝐹𝑦}) |
10 | 9 | adantr 481 | . 2 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → (𝐹 “ {𝐵}) = {𝑦 ∣ 𝐵𝐹𝑦}) |
11 | 4, 6, 10 | 3eqtr4d 2666 | 1 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → {(𝐹‘𝐵)} = (𝐹 “ {𝐵})) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 384 = wceq 1483 ∈ wcel 1990 {cab 2608 {csn 4177 class class class wbr 4653 “ cima 5117 Rel wrel 5119 Fn wfn 5883 ‘cfv 5888 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pr 4906 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-sbc 3436 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-opab 4713 df-id 5024 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-iota 5851 df-fun 5890 df-fn 5891 df-fv 5896 |
This theorem is referenced by: fnimapr 6262 funfv 6265 fvco2 6273 fvimacnvi 6331 fvimacnvALT 6336 fsn2 6403 fparlem3 7279 fparlem4 7280 suppval1 7301 suppsnop 7309 domunsncan 8060 phplem4 8142 domunfican 8233 fiint 8237 infdifsn 8554 cantnfp1lem3 8577 resunimafz0 13229 symgfixelsi 17855 dprdf1o 18431 frlmlbs 20136 f1lindf 20161 cnt1 21154 xkohaus 21456 xkoptsub 21457 ustuqtop3 22047 eulerpartlemmf 30437 poimirlem4 33413 poimirlem6 33415 poimirlem7 33416 poimirlem9 33418 poimirlem13 33422 poimirlem14 33423 poimirlem16 33425 poimirlem19 33428 grpokerinj 33692 k0004lem3 38447 funcoressn 41207 |
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