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| Mirrors > Home > MPE Home > Th. List > quslem | Structured version Visualization version GIF version | ||
| Description: The function in qusval 17497 is a surjection onto a quotient set. (Contributed by Mario Carneiro, 23-Feb-2015.) |
| Ref | Expression |
|---|---|
| qusval.u | ⊢ (𝜑 → 𝑈 = (𝑅 /s ∼ )) |
| qusval.v | ⊢ (𝜑 → 𝑉 = (Base‘𝑅)) |
| qusval.f | ⊢ 𝐹 = (𝑥 ∈ 𝑉 ↦ [𝑥] ∼ ) |
| qusval.e | ⊢ (𝜑 → ∼ ∈ 𝑊) |
| qusval.r | ⊢ (𝜑 → 𝑅 ∈ 𝑍) |
| Ref | Expression |
|---|---|
| quslem | ⊢ (𝜑 → 𝐹:𝑉–onto→(𝑉 / ∼ )) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | qusval.e | . . . . . 6 ⊢ (𝜑 → ∼ ∈ 𝑊) | |
| 2 | ecexg 8637 | . . . . . 6 ⊢ ( ∼ ∈ 𝑊 → [𝑥] ∼ ∈ V) | |
| 3 | 1, 2 | syl 17 | . . . . 5 ⊢ (𝜑 → [𝑥] ∼ ∈ V) |
| 4 | 3 | ralrimivw 3135 | . . . 4 ⊢ (𝜑 → ∀𝑥 ∈ 𝑉 [𝑥] ∼ ∈ V) |
| 5 | qusval.f | . . . . 5 ⊢ 𝐹 = (𝑥 ∈ 𝑉 ↦ [𝑥] ∼ ) | |
| 6 | 5 | fnmpt 6625 | . . . 4 ⊢ (∀𝑥 ∈ 𝑉 [𝑥] ∼ ∈ V → 𝐹 Fn 𝑉) |
| 7 | 4, 6 | syl 17 | . . 3 ⊢ (𝜑 → 𝐹 Fn 𝑉) |
| 8 | dffn4 6745 | . . 3 ⊢ (𝐹 Fn 𝑉 ↔ 𝐹:𝑉–onto→ran 𝐹) | |
| 9 | 7, 8 | sylib 219 | . 2 ⊢ (𝜑 → 𝐹:𝑉–onto→ran 𝐹) |
| 10 | 5 | rnmpt 5899 | . . . 4 ⊢ ran 𝐹 = {𝑦 ∣ ∃𝑥 ∈ 𝑉 𝑦 = [𝑥] ∼ } |
| 11 | df-qs 8639 | . . . 4 ⊢ (𝑉 / ∼ ) = {𝑦 ∣ ∃𝑥 ∈ 𝑉 𝑦 = [𝑥] ∼ } | |
| 12 | 10, 11 | eqtr4i 2765 | . . 3 ⊢ ran 𝐹 = (𝑉 / ∼ ) |
| 13 | foeq3 6737 | . . 3 ⊢ (ran 𝐹 = (𝑉 / ∼ ) → (𝐹:𝑉–onto→ran 𝐹 ↔ 𝐹:𝑉–onto→(𝑉 / ∼ ))) | |
| 14 | 12, 13 | ax-mp 5 | . 2 ⊢ (𝐹:𝑉–onto→ran 𝐹 ↔ 𝐹:𝑉–onto→(𝑉 / ∼ )) |
| 15 | 9, 14 | sylib 219 | 1 ⊢ (𝜑 → 𝐹:𝑉–onto→(𝑉 / ∼ )) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 207 = wceq 1547 ∈ wcel 2119 {cab 2717 ∀wral 3053 ∃wrex 3063 Vcvv 3431 ↦ cmpt 5153 ran crn 5619 Fn wfn 6480 –onto→wfo 6483 ‘cfv 6485 (class class class)co 7356 [cec 8631 / cqs 8632 Basecbs 17170 /s cqus 17460 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-sep 5218 ax-pr 5362 ax-un 7678 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ral 3054 df-rex 3064 df-rab 3392 df-v 3433 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4262 df-if 4455 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-br 5073 df-opab 5135 df-mpt 5154 df-id 5513 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-rn 5629 df-res 5630 df-ima 5631 df-fun 6487 df-fn 6488 df-fo 6491 df-ec 8635 df-qs 8639 |
| This theorem is referenced by: qusbas 17500 quss 17501 qusaddvallem 17506 qusaddflem 17507 qusaddval 17508 qusaddf 17509 qusmulval 17510 qusmulf 17511 qusgrp2 19025 qusrng 20152 qusring2 20305 znzrhfo 21522 qustps 23705 qustgpopn 24103 qustgplem 24104 qustgphaus 24106 qusker 33432 qusvsval 33435 quslmod 33441 quslmhm 33442 qusdimsum 33812 |
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