Theorem fundcmpsurinjpreimafv 47282

Description: Every function 𝐹:𝐴⟶𝐵 can be decomposed into a surjective function onto 𝑃 and an injective function from 𝑃. (Contributed by AV, 12-Mar-2024.) (Proof shortened by AV, 22-Mar-2024.)

Hypothesis

Ref	Expression
fundcmpsurinj.p	⊢ 𝑃 = {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = (◡𝐹 “ {(𝐹‘𝑥)})}

Assertion

Ref	Expression
fundcmpsurinjpreimafv	⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉) → ∃𝑔∃ℎ(𝑔:𝐴–onto→𝑃 ∧ ℎ:𝑃–1-1→𝐵 ∧ 𝐹 = (ℎ ∘ 𝑔)))

Distinct variable groups:   𝑥,𝐴,𝑧   𝑥,𝐹,𝑧   𝐴,𝑔,ℎ   𝐵,𝑔,ℎ,𝑥   𝑧,𝐵   𝑔,𝐹,ℎ   𝑃,𝑔,ℎ,𝑥   𝑥,𝑉,𝑔

Allowed substitution hints:   𝑃(𝑧)   𝑉(𝑧,ℎ)

Proof of Theorem fundcmpsurinjpreimafv

Dummy variables 𝑓 𝑗 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		fundcmpsurinj.p	. . 3 ⊢ 𝑃 = {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = (◡𝐹 “ {(𝐹‘𝑥)})}
2	1	fundcmpsurbijinjpreimafv 47281	. 2 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉) → ∃𝑔∃𝑓∃𝑗((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔)))
3		vex 3492	. . . . . . 7 ⊢ 𝑗 ∈ V
4		vex 3492	. . . . . . 7 ⊢ 𝑓 ∈ V
5	3, 4	coex 7970	. . . . . 6 ⊢ (𝑗 ∘ 𝑓) ∈ V
6		simprl1 1218	. . . . . . 7 ⊢ (((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉) ∧ ((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔))) → 𝑔:𝐴–onto→𝑃)
7		simp3 1138	. . . . . . . . 9 ⊢ ((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) → 𝑗:(𝐹 “ 𝐴)–1-1→𝐵)
8		f1of1 6861	. . . . . . . . . 10 ⊢ (𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) → 𝑓:𝑃–1-1→(𝐹 “ 𝐴))
9	8	3ad2ant2 1134	. . . . . . . . 9 ⊢ ((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) → 𝑓:𝑃–1-1→(𝐹 “ 𝐴))
10		f1co 6828	. . . . . . . . 9 ⊢ ((𝑗:(𝐹 “ 𝐴)–1-1→𝐵 ∧ 𝑓:𝑃–1-1→(𝐹 “ 𝐴)) → (𝑗 ∘ 𝑓):𝑃–1-1→𝐵)
11	7, 9, 10	syl2anc 583	. . . . . . . 8 ⊢ ((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) → (𝑗 ∘ 𝑓):𝑃–1-1→𝐵)
12	11	ad2antrl 727	. . . . . . 7 ⊢ (((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉) ∧ ((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔))) → (𝑗 ∘ 𝑓):𝑃–1-1→𝐵)
13		simprr 772	. . . . . . 7 ⊢ (((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉) ∧ ((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔))) → 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔))
14	6, 12, 13	3jca 1128	. . . . . 6 ⊢ (((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉) ∧ ((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔))) → (𝑔:𝐴–onto→𝑃 ∧ (𝑗 ∘ 𝑓):𝑃–1-1→𝐵 ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔)))
15		f1eq1 6812	. . . . . . . 8 ⊢ (ℎ = (𝑗 ∘ 𝑓) → (ℎ:𝑃–1-1→𝐵 ↔ (𝑗 ∘ 𝑓):𝑃–1-1→𝐵))
16		coeq1 5882	. . . . . . . . 9 ⊢ (ℎ = (𝑗 ∘ 𝑓) → (ℎ ∘ 𝑔) = ((𝑗 ∘ 𝑓) ∘ 𝑔))
17	16	eqeq2d 2751	. . . . . . . 8 ⊢ (ℎ = (𝑗 ∘ 𝑓) → (𝐹 = (ℎ ∘ 𝑔) ↔ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔)))
18	15, 17	3anbi23d 1439	. . . . . . 7 ⊢ (ℎ = (𝑗 ∘ 𝑓) → ((𝑔:𝐴–onto→𝑃 ∧ ℎ:𝑃–1-1→𝐵 ∧ 𝐹 = (ℎ ∘ 𝑔)) ↔ (𝑔:𝐴–onto→𝑃 ∧ (𝑗 ∘ 𝑓):𝑃–1-1→𝐵 ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔))))
19	18	spcegv 3610	. . . . . 6 ⊢ ((𝑗 ∘ 𝑓) ∈ V → ((𝑔:𝐴–onto→𝑃 ∧ (𝑗 ∘ 𝑓):𝑃–1-1→𝐵 ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔)) → ∃ℎ(𝑔:𝐴–onto→𝑃 ∧ ℎ:𝑃–1-1→𝐵 ∧ 𝐹 = (ℎ ∘ 𝑔))))
20	5, 14, 19	mpsyl 68	. . . . 5 ⊢ (((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉) ∧ ((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔))) → ∃ℎ(𝑔:𝐴–onto→𝑃 ∧ ℎ:𝑃–1-1→𝐵 ∧ 𝐹 = (ℎ ∘ 𝑔)))
21	20	ex 412	. . . 4 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉) → (((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔)) → ∃ℎ(𝑔:𝐴–onto→𝑃 ∧ ℎ:𝑃–1-1→𝐵 ∧ 𝐹 = (ℎ ∘ 𝑔))))
22	21	exlimdvv 1933	. . 3 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉) → (∃𝑓∃𝑗((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔)) → ∃ℎ(𝑔:𝐴–onto→𝑃 ∧ ℎ:𝑃–1-1→𝐵 ∧ 𝐹 = (ℎ ∘ 𝑔))))
23	22	eximdv 1916	. 2 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉) → (∃𝑔∃𝑓∃𝑗((𝑔:𝐴–onto→𝑃 ∧ 𝑓:𝑃–1-1-onto→(𝐹 “ 𝐴) ∧ 𝑗:(𝐹 “ 𝐴)–1-1→𝐵) ∧ 𝐹 = ((𝑗 ∘ 𝑓) ∘ 𝑔)) → ∃𝑔∃ℎ(𝑔:𝐴–onto→𝑃 ∧ ℎ:𝑃–1-1→𝐵 ∧ 𝐹 = (ℎ ∘ 𝑔))))
24	2, 23	mpd 15	1 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉) → ∃𝑔∃ℎ(𝑔:𝐴–onto→𝑃 ∧ ℎ:𝑃–1-1→𝐵 ∧ 𝐹 = (ℎ ∘ 𝑔)))

Syntax hints:   → wi 4   ∧ wa 395   ∧ w3a 1087   = wceq 1537  ∃wex 1777   ∈ wcel 2108  {cab 2717  ∃wrex 3076  Vcvv 3488  {csn 4648  ^◡ccnv 5699   “ cima 5703   ∘ ccom 5704  ⟶wf 6569  –1-1→wf1 6570  –onto→wfo 6571  –1-1-onto→wf1o 6572  ‘cfv 6573

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-rep 5303  ax-sep 5317  ax-nul 5324  ax-pow 5383  ax-pr 5447  ax-un 7770

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2543  df-eu 2572  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ne 2947  df-nel 3053  df-ral 3068  df-rex 3077  df-reu 3389  df-rab 3444  df-v 3490  df-sbc 3805  df-csb 3922  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-nul 4353  df-if 4549  df-pw 4624  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-iun 5017  df-br 5167  df-opab 5229  df-mpt 5250  df-id 5593  df-xp 5706  df-rel 5707  df-cnv 5708  df-co 5709  df-dm 5710  df-rn 5711  df-res 5712  df-ima 5713  df-iota 6525  df-fun 6575  df-fn 6576  df-f 6577  df-f1 6578  df-fo 6579  df-f1o 6580  df-fv 6581

This theorem is referenced by:  fundcmpsurinj  47283