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Theorem curf 33718
 Description: Functional property of currying. (Contributed by Brendan Leahy, 2-Jun-2021.)
Assertion
Ref Expression
curf ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ∈ (𝑉 ∖ {∅}) ∧ 𝐶𝑊) → curry 𝐹:𝐴⟶(𝐶𝑚 𝐵))

Proof of Theorem curf
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 opelxpi 5305 . . . . . . . 8 ((𝑥𝐴𝑦𝐵) → ⟨𝑥, 𝑦⟩ ∈ (𝐴 × 𝐵))
2 ffvelrn 6521 . . . . . . . 8 ((𝐹:(𝐴 × 𝐵)⟶𝐶 ∧ ⟨𝑥, 𝑦⟩ ∈ (𝐴 × 𝐵)) → (𝐹‘⟨𝑥, 𝑦⟩) ∈ 𝐶)
31, 2sylan2 492 . . . . . . 7 ((𝐹:(𝐴 × 𝐵)⟶𝐶 ∧ (𝑥𝐴𝑦𝐵)) → (𝐹‘⟨𝑥, 𝑦⟩) ∈ 𝐶)
43anassrs 683 . . . . . 6 (((𝐹:(𝐴 × 𝐵)⟶𝐶𝑥𝐴) ∧ 𝑦𝐵) → (𝐹‘⟨𝑥, 𝑦⟩) ∈ 𝐶)
5 eqid 2760 . . . . . 6 (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)) = (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩))
64, 5fmptd 6549 . . . . 5 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝑥𝐴) → (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)):𝐵𝐶)
763ad2antl1 1201 . . . 4 (((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ∈ (𝑉 ∖ {∅}) ∧ 𝐶𝑊) ∧ 𝑥𝐴) → (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)):𝐵𝐶)
8 elmapg 8038 . . . . . . 7 ((𝐶𝑊𝐵 ∈ (𝑉 ∖ {∅})) → ((𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)) ∈ (𝐶𝑚 𝐵) ↔ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)):𝐵𝐶))
98ancoms 468 . . . . . 6 ((𝐵 ∈ (𝑉 ∖ {∅}) ∧ 𝐶𝑊) → ((𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)) ∈ (𝐶𝑚 𝐵) ↔ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)):𝐵𝐶))
1093adant1 1125 . . . . 5 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ∈ (𝑉 ∖ {∅}) ∧ 𝐶𝑊) → ((𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)) ∈ (𝐶𝑚 𝐵) ↔ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)):𝐵𝐶))
1110adantr 472 . . . 4 (((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ∈ (𝑉 ∖ {∅}) ∧ 𝐶𝑊) ∧ 𝑥𝐴) → ((𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)) ∈ (𝐶𝑚 𝐵) ↔ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)):𝐵𝐶))
127, 11mpbird 247 . . 3 (((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ∈ (𝑉 ∖ {∅}) ∧ 𝐶𝑊) ∧ 𝑥𝐴) → (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)) ∈ (𝐶𝑚 𝐵))
13 eqid 2760 . . 3 (𝑥𝐴 ↦ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩))) = (𝑥𝐴 ↦ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)))
1412, 13fmptd 6549 . 2 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ∈ (𝑉 ∖ {∅}) ∧ 𝐶𝑊) → (𝑥𝐴 ↦ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩))):𝐴⟶(𝐶𝑚 𝐵))
15 eldifsni 4466 . . . 4 (𝐵 ∈ (𝑉 ∖ {∅}) → 𝐵 ≠ ∅)
16 df-cur 7563 . . . . . 6 curry 𝐹 = (𝑥 ∈ dom dom 𝐹 ↦ {⟨𝑦, 𝑧⟩ ∣ ⟨𝑥, 𝑦𝐹𝑧})
17 fdm 6212 . . . . . . . . . 10 (𝐹:(𝐴 × 𝐵)⟶𝐶 → dom 𝐹 = (𝐴 × 𝐵))
1817dmeqd 5481 . . . . . . . . 9 (𝐹:(𝐴 × 𝐵)⟶𝐶 → dom dom 𝐹 = dom (𝐴 × 𝐵))
19 dmxp 5499 . . . . . . . . 9 (𝐵 ≠ ∅ → dom (𝐴 × 𝐵) = 𝐴)
2018, 19sylan9eq 2814 . . . . . . . 8 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ≠ ∅) → dom dom 𝐹 = 𝐴)
2120mpteq1d 4890 . . . . . . 7 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ≠ ∅) → (𝑥 ∈ dom dom 𝐹 ↦ {⟨𝑦, 𝑧⟩ ∣ ⟨𝑥, 𝑦𝐹𝑧}) = (𝑥𝐴 ↦ {⟨𝑦, 𝑧⟩ ∣ ⟨𝑥, 𝑦𝐹𝑧}))
22 ffun 6209 . . . . . . . . . . . . . 14 (𝐹:(𝐴 × 𝐵)⟶𝐶 → Fun 𝐹)
23 funbrfv2b 6403 . . . . . . . . . . . . . 14 (Fun 𝐹 → (⟨𝑥, 𝑦𝐹𝑧 ↔ (⟨𝑥, 𝑦⟩ ∈ dom 𝐹 ∧ (𝐹‘⟨𝑥, 𝑦⟩) = 𝑧)))
2422, 23syl 17 . . . . . . . . . . . . 13 (𝐹:(𝐴 × 𝐵)⟶𝐶 → (⟨𝑥, 𝑦𝐹𝑧 ↔ (⟨𝑥, 𝑦⟩ ∈ dom 𝐹 ∧ (𝐹‘⟨𝑥, 𝑦⟩) = 𝑧)))
2517eleq2d 2825 . . . . . . . . . . . . . . 15 (𝐹:(𝐴 × 𝐵)⟶𝐶 → (⟨𝑥, 𝑦⟩ ∈ dom 𝐹 ↔ ⟨𝑥, 𝑦⟩ ∈ (𝐴 × 𝐵)))
26 opelxp 5303 . . . . . . . . . . . . . . 15 (⟨𝑥, 𝑦⟩ ∈ (𝐴 × 𝐵) ↔ (𝑥𝐴𝑦𝐵))
2725, 26syl6bb 276 . . . . . . . . . . . . . 14 (𝐹:(𝐴 × 𝐵)⟶𝐶 → (⟨𝑥, 𝑦⟩ ∈ dom 𝐹 ↔ (𝑥𝐴𝑦𝐵)))
2827anbi1d 743 . . . . . . . . . . . . 13 (𝐹:(𝐴 × 𝐵)⟶𝐶 → ((⟨𝑥, 𝑦⟩ ∈ dom 𝐹 ∧ (𝐹‘⟨𝑥, 𝑦⟩) = 𝑧) ↔ ((𝑥𝐴𝑦𝐵) ∧ (𝐹‘⟨𝑥, 𝑦⟩) = 𝑧)))
2924, 28bitrd 268 . . . . . . . . . . . 12 (𝐹:(𝐴 × 𝐵)⟶𝐶 → (⟨𝑥, 𝑦𝐹𝑧 ↔ ((𝑥𝐴𝑦𝐵) ∧ (𝐹‘⟨𝑥, 𝑦⟩) = 𝑧)))
30 ibar 526 . . . . . . . . . . . . 13 (𝑥𝐴 → ((𝑦𝐵𝑧 = (𝐹‘⟨𝑥, 𝑦⟩)) ↔ (𝑥𝐴 ∧ (𝑦𝐵𝑧 = (𝐹‘⟨𝑥, 𝑦⟩)))))
31 anass 684 . . . . . . . . . . . . . 14 (((𝑥𝐴𝑦𝐵) ∧ 𝑧 = (𝐹‘⟨𝑥, 𝑦⟩)) ↔ (𝑥𝐴 ∧ (𝑦𝐵𝑧 = (𝐹‘⟨𝑥, 𝑦⟩))))
32 eqcom 2767 . . . . . . . . . . . . . . 15 (𝑧 = (𝐹‘⟨𝑥, 𝑦⟩) ↔ (𝐹‘⟨𝑥, 𝑦⟩) = 𝑧)
3332anbi2i 732 . . . . . . . . . . . . . 14 (((𝑥𝐴𝑦𝐵) ∧ 𝑧 = (𝐹‘⟨𝑥, 𝑦⟩)) ↔ ((𝑥𝐴𝑦𝐵) ∧ (𝐹‘⟨𝑥, 𝑦⟩) = 𝑧))
3431, 33bitr3i 266 . . . . . . . . . . . . 13 ((𝑥𝐴 ∧ (𝑦𝐵𝑧 = (𝐹‘⟨𝑥, 𝑦⟩))) ↔ ((𝑥𝐴𝑦𝐵) ∧ (𝐹‘⟨𝑥, 𝑦⟩) = 𝑧))
3530, 34syl6rbb 277 . . . . . . . . . . . 12 (𝑥𝐴 → (((𝑥𝐴𝑦𝐵) ∧ (𝐹‘⟨𝑥, 𝑦⟩) = 𝑧) ↔ (𝑦𝐵𝑧 = (𝐹‘⟨𝑥, 𝑦⟩))))
3629, 35sylan9bb 738 . . . . . . . . . . 11 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝑥𝐴) → (⟨𝑥, 𝑦𝐹𝑧 ↔ (𝑦𝐵𝑧 = (𝐹‘⟨𝑥, 𝑦⟩))))
3736opabbidv 4868 . . . . . . . . . 10 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝑥𝐴) → {⟨𝑦, 𝑧⟩ ∣ ⟨𝑥, 𝑦𝐹𝑧} = {⟨𝑦, 𝑧⟩ ∣ (𝑦𝐵𝑧 = (𝐹‘⟨𝑥, 𝑦⟩))})
38 df-mpt 4882 . . . . . . . . . 10 (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)) = {⟨𝑦, 𝑧⟩ ∣ (𝑦𝐵𝑧 = (𝐹‘⟨𝑥, 𝑦⟩))}
3937, 38syl6eqr 2812 . . . . . . . . 9 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝑥𝐴) → {⟨𝑦, 𝑧⟩ ∣ ⟨𝑥, 𝑦𝐹𝑧} = (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩)))
4039mpteq2dva 4896 . . . . . . . 8 (𝐹:(𝐴 × 𝐵)⟶𝐶 → (𝑥𝐴 ↦ {⟨𝑦, 𝑧⟩ ∣ ⟨𝑥, 𝑦𝐹𝑧}) = (𝑥𝐴 ↦ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩))))
4140adantr 472 . . . . . . 7 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ≠ ∅) → (𝑥𝐴 ↦ {⟨𝑦, 𝑧⟩ ∣ ⟨𝑥, 𝑦𝐹𝑧}) = (𝑥𝐴 ↦ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩))))
4221, 41eqtrd 2794 . . . . . 6 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ≠ ∅) → (𝑥 ∈ dom dom 𝐹 ↦ {⟨𝑦, 𝑧⟩ ∣ ⟨𝑥, 𝑦𝐹𝑧}) = (𝑥𝐴 ↦ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩))))
4316, 42syl5eq 2806 . . . . 5 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ≠ ∅) → curry 𝐹 = (𝑥𝐴 ↦ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩))))
4443feq1d 6191 . . . 4 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ≠ ∅) → (curry 𝐹:𝐴⟶(𝐶𝑚 𝐵) ↔ (𝑥𝐴 ↦ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩))):𝐴⟶(𝐶𝑚 𝐵)))
4515, 44sylan2 492 . . 3 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ∈ (𝑉 ∖ {∅})) → (curry 𝐹:𝐴⟶(𝐶𝑚 𝐵) ↔ (𝑥𝐴 ↦ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩))):𝐴⟶(𝐶𝑚 𝐵)))
46453adant3 1127 . 2 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ∈ (𝑉 ∖ {∅}) ∧ 𝐶𝑊) → (curry 𝐹:𝐴⟶(𝐶𝑚 𝐵) ↔ (𝑥𝐴 ↦ (𝑦𝐵 ↦ (𝐹‘⟨𝑥, 𝑦⟩))):𝐴⟶(𝐶𝑚 𝐵)))
4714, 46mpbird 247 1 ((𝐹:(𝐴 × 𝐵)⟶𝐶𝐵 ∈ (𝑉 ∖ {∅}) ∧ 𝐶𝑊) → curry 𝐹:𝐴⟶(𝐶𝑚 𝐵))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 383   ∧ w3a 1072   = wceq 1632   ∈ wcel 2139   ≠ wne 2932   ∖ cdif 3712  ∅c0 4058  {csn 4321  ⟨cop 4327   class class class wbr 4804  {copab 4864   ↦ cmpt 4881   × cxp 5264  dom cdm 5266  Fun wfun 6043  ⟶wf 6045  ‘cfv 6049  (class class class)co 6814  curry ccur 7561   ↑𝑚 cmap 8025 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-8 2141  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-sep 4933  ax-nul 4941  ax-pow 4992  ax-pr 5055  ax-un 7115 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-ral 3055  df-rex 3056  df-rab 3059  df-v 3342  df-sbc 3577  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-nul 4059  df-if 4231  df-pw 4304  df-sn 4322  df-pr 4324  df-op 4328  df-uni 4589  df-br 4805  df-opab 4865  df-mpt 4882  df-id 5174  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-rn 5277  df-res 5278  df-ima 5279  df-iota 6012  df-fun 6051  df-fn 6052  df-f 6053  df-fv 6057  df-ov 6817  df-oprab 6818  df-mpt2 6819  df-cur 7563  df-map 8027 This theorem is referenced by:  unccur  33723  matunitlindflem1  33736  matunitlindflem2  33737
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