Theorem f1o2d 5728

Description: Describe an implicit one-to-one onto function. (Contributed by Mario Carneiro, 12-May-2014.)

Hypotheses

Ref	Expression
f1od.1	⊢ F = (x ∈ A ↦ C)
f1o2d.2	⊢ ((φ ∧ x ∈ A) → C ∈ B)
f1o2d.3	⊢ ((φ ∧ y ∈ B) → D ∈ A)
f1o2d.4	⊢ ((φ ∧ (x ∈ A ∧ y ∈ B)) → (x = D ↔ y = C))

Assertion

Ref	Expression
f1o2d	⊢ (φ → F:A–1-1-onto→B)

Distinct variable groups:   x,y,A   x,B,y   y,C   x,D   φ,x,y

Allowed substitution hints:   C(x)   D(y)   F(x,y)

Proof of Theorem f1o2d

Step	Hyp	Ref	Expression
1		f1od.1	. 2 ⊢ F = (x ∈ A ↦ C)
2		f1o2d.2	. 2 ⊢ ((φ ∧ x ∈ A) → C ∈ B)
3		f1o2d.3	. 2 ⊢ ((φ ∧ y ∈ B) → D ∈ A)
4		eleq1a 2422	. . . . . 6 ⊢ (C ∈ B → (y = C → y ∈ B))
5	2, 4	syl 15	. . . . 5 ⊢ ((φ ∧ x ∈ A) → (y = C → y ∈ B))
6	5	impr 602	. . . 4 ⊢ ((φ ∧ (x ∈ A ∧ y = C)) → y ∈ B)
7		f1o2d.4	. . . . . . . 8 ⊢ ((φ ∧ (x ∈ A ∧ y ∈ B)) → (x = D ↔ y = C))
8	7	biimpar 471	. . . . . . 7 ⊢ (((φ ∧ (x ∈ A ∧ y ∈ B)) ∧ y = C) → x = D)
9	8	exp42 594	. . . . . 6 ⊢ (φ → (x ∈ A → (y ∈ B → (y = C → x = D))))
10	9	com34 77	. . . . 5 ⊢ (φ → (x ∈ A → (y = C → (y ∈ B → x = D))))
11	10	imp32 422	. . . 4 ⊢ ((φ ∧ (x ∈ A ∧ y = C)) → (y ∈ B → x = D))
12	6, 11	jcai 522	. . 3 ⊢ ((φ ∧ (x ∈ A ∧ y = C)) → (y ∈ B ∧ x = D))
13		eleq1a 2422	. . . . . 6 ⊢ (D ∈ A → (x = D → x ∈ A))
14	3, 13	syl 15	. . . . 5 ⊢ ((φ ∧ y ∈ B) → (x = D → x ∈ A))
15	14	impr 602	. . . 4 ⊢ ((φ ∧ (y ∈ B ∧ x = D)) → x ∈ A)
16	7	biimpa 470	. . . . . . . 8 ⊢ (((φ ∧ (x ∈ A ∧ y ∈ B)) ∧ x = D) → y = C)
17	16	exp42 594	. . . . . . 7 ⊢ (φ → (x ∈ A → (y ∈ B → (x = D → y = C))))
18	17	com23 72	. . . . . 6 ⊢ (φ → (y ∈ B → (x ∈ A → (x = D → y = C))))
19	18	com34 77	. . . . 5 ⊢ (φ → (y ∈ B → (x = D → (x ∈ A → y = C))))
20	19	imp32 422	. . . 4 ⊢ ((φ ∧ (y ∈ B ∧ x = D)) → (x ∈ A → y = C))
21	15, 20	jcai 522	. . 3 ⊢ ((φ ∧ (y ∈ B ∧ x = D)) → (x ∈ A ∧ y = C))
22	12, 21	impbida 805	. 2 ⊢ (φ → ((x ∈ A ∧ y = C) ↔ (y ∈ B ∧ x = D)))
23	1, 2, 3, 22	f1od 5727	1 ⊢ (φ → F:A–1-1-onto→B)

Syntax hints:   → wi 4   ↔ wb 176   ∧ wa 358   = wceq 1642   ∈ wcel 1710  –1-1-onto→wf1o 4781   ↦ cmpt 5652

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-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-mpt 5653

This theorem is referenced by: (None)