Theorem f1ofveu 5481

Description: There is one domain element for each value of a one-to-one onto function. (Contributed by set.mm contributors, 26-May-2006.)

Assertion

Ref	Expression
f1ofveu	⊢ ((F:A–1-1-onto→B ∧ C ∈ B) → ∃!x ∈ A (F ‘x) = C)

Distinct variable groups:   x,A   x,B   x,C   x,F

Proof of Theorem f1ofveu

Step	Hyp	Ref	Expression
1		f1ocnv 5300	. . . 4 ⊢ (F:A–1-1-onto→B → ◡F:B–1-1-onto→A)
2		f1of 5288	. . . 4 ⊢ (◡F:B–1-1-onto→A → ◡F:B–→A)
3	1, 2	syl 15	. . 3 ⊢ (F:A–1-1-onto→B → ◡F:B–→A)
4		feu 5243	. . 3 ⊢ ((◡F:B–→A ∧ C ∈ B) → ∃!x ∈ A ⟨C, x⟩ ∈ ◡F)
5	3, 4	sylan 457	. 2 ⊢ ((F:A–1-1-onto→B ∧ C ∈ B) → ∃!x ∈ A ⟨C, x⟩ ∈ ◡F)
6		f1ofn 5289	. . . 4 ⊢ (F:A–1-1-onto→B → F Fn A)
7		fnopfvb 5360	. . . . . 6 ⊢ ((F Fn A ∧ x ∈ A) → ((F ‘x) = C ↔ ⟨x, C⟩ ∈ F))
8		opelcnv 4894	. . . . . 6 ⊢ (⟨C, x⟩ ∈ ◡F ↔ ⟨x, C⟩ ∈ F)
9	7, 8	syl6bbr 254	. . . . 5 ⊢ ((F Fn A ∧ x ∈ A) → ((F ‘x) = C ↔ ⟨C, x⟩ ∈ ◡F))
10	9	reubidva 2795	. . . 4 ⊢ (F Fn A → (∃!x ∈ A (F ‘x) = C ↔ ∃!x ∈ A ⟨C, x⟩ ∈ ◡F))
11	6, 10	syl 15	. . 3 ⊢ (F:A–1-1-onto→B → (∃!x ∈ A (F ‘x) = C ↔ ∃!x ∈ A ⟨C, x⟩ ∈ ◡F))
12	11	adantr 451	. 2 ⊢ ((F:A–1-1-onto→B ∧ C ∈ B) → (∃!x ∈ A (F ‘x) = C ↔ ∃!x ∈ A ⟨C, x⟩ ∈ ◡F))
13	5, 12	mpbird 223	1 ⊢ ((F:A–1-1-onto→B ∧ C ∈ B) → ∃!x ∈ A (F ‘x) = C)

Syntax hints:   → wi 4   ↔ wb 176   ∧ wa 358   = wceq 1642   ∈ wcel 1710  ∃!wreu 2617  ⟨cop 4562  ^◡ccnv 4772   Fn wfn 4777  –→wf 4778  –1-1-onto→wf1o 4781   ‘cfv 4782

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-13 1712  ax-14 1714  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4079  ax-xp 4080  ax-cnv 4081  ax-1c 4082  ax-sset 4083  ax-si 4084  ax-ins2 4085  ax-ins3 4086  ax-typlower 4087  ax-sn 4088

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2208  df-mo 2209  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2479  df-ne 2519  df-ral 2620  df-rex 2621  df-reu 2622  df-rmo 2623  df-rab 2624  df-v 2862  df-sbc 3048  df-nin 3212  df-compl 3213  df-in 3214  df-un 3215  df-dif 3216  df-symdif 3217  df-ss 3260  df-pss 3262  df-nul 3552  df-if 3664  df-pw 3725  df-sn 3742  df-pr 3743  df-uni 3893  df-int 3928  df-opk 4059  df-1c 4137  df-pw1 4138  df-uni1 4139  df-xpk 4186  df-cnvk 4187  df-ins2k 4188  df-ins3k 4189  df-imak 4190  df-cok 4191  df-p6 4192  df-sik 4193  df-ssetk 4194  df-imagek 4195  df-idk 4196  df-iota 4340  df-0c 4378  df-addc 4379  df-nnc 4380  df-fin 4381  df-lefin 4441  df-ltfin 4442  df-ncfin 4443  df-tfin 4444  df-evenfin 4445  df-oddfin 4446  df-sfin 4447  df-spfin 4448  df-phi 4566  df-op 4567  df-proj1 4568  df-proj2 4569  df-opab 4624  df-br 4641  df-co 4727  df-ima 4728  df-id 4768  df-xp 4785  df-cnv 4786  df-rn 4787  df-dm 4788  df-fun 4790  df-fn 4791  df-f 4792  df-f1 4793  df-fo 4794  df-f1o 4795  df-fv 4796

This theorem is referenced by: (None)