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Theorem dfac9 9551
 Description: Equivalence of the axiom of choice with a statement related to ac9 9898; definition AC3 of [Schechter] p. 139. (Contributed by Stefan O'Rear, 22-Feb-2015.)
Assertion
Ref Expression
dfac9 (CHOICE ↔ ∀𝑓((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅))
Distinct variable group:   𝑥,𝑓

Proof of Theorem dfac9
Dummy variables 𝑔 𝑠 𝑡 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 dfac3 9536 . 2 (CHOICE ↔ ∀𝑠𝑔𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡))
2 vex 3447 . . . . . . 7 𝑓 ∈ V
32rnex 7603 . . . . . 6 ran 𝑓 ∈ V
4 raleq 3361 . . . . . . 7 (𝑠 = ran 𝑓 → (∀𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡) ↔ ∀𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡)))
54exbidv 1922 . . . . . 6 (𝑠 = ran 𝑓 → (∃𝑔𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡) ↔ ∃𝑔𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡)))
63, 5spcv 3557 . . . . 5 (∀𝑠𝑔𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡) → ∃𝑔𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡))
7 df-nel 3095 . . . . . . . . . . . . . . 15 (∅ ∉ ran 𝑓 ↔ ¬ ∅ ∈ ran 𝑓)
87biimpi 219 . . . . . . . . . . . . . 14 (∅ ∉ ran 𝑓 → ¬ ∅ ∈ ran 𝑓)
98ad2antlr 726 . . . . . . . . . . . . 13 (((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ 𝑥 ∈ dom 𝑓) → ¬ ∅ ∈ ran 𝑓)
10 fvelrn 6825 . . . . . . . . . . . . . . . 16 ((Fun 𝑓𝑥 ∈ dom 𝑓) → (𝑓𝑥) ∈ ran 𝑓)
1110adantlr 714 . . . . . . . . . . . . . . 15 (((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ 𝑥 ∈ dom 𝑓) → (𝑓𝑥) ∈ ran 𝑓)
12 eleq1 2880 . . . . . . . . . . . . . . 15 ((𝑓𝑥) = ∅ → ((𝑓𝑥) ∈ ran 𝑓 ↔ ∅ ∈ ran 𝑓))
1311, 12syl5ibcom 248 . . . . . . . . . . . . . 14 (((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ 𝑥 ∈ dom 𝑓) → ((𝑓𝑥) = ∅ → ∅ ∈ ran 𝑓))
1413necon3bd 3004 . . . . . . . . . . . . 13 (((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ 𝑥 ∈ dom 𝑓) → (¬ ∅ ∈ ran 𝑓 → (𝑓𝑥) ≠ ∅))
159, 14mpd 15 . . . . . . . . . . . 12 (((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ 𝑥 ∈ dom 𝑓) → (𝑓𝑥) ≠ ∅)
1615adantlr 714 . . . . . . . . . . 11 ((((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ ∀𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡)) ∧ 𝑥 ∈ dom 𝑓) → (𝑓𝑥) ≠ ∅)
17 neeq1 3052 . . . . . . . . . . . . 13 (𝑡 = (𝑓𝑥) → (𝑡 ≠ ∅ ↔ (𝑓𝑥) ≠ ∅))
18 fveq2 6649 . . . . . . . . . . . . . 14 (𝑡 = (𝑓𝑥) → (𝑔𝑡) = (𝑔‘(𝑓𝑥)))
19 id 22 . . . . . . . . . . . . . 14 (𝑡 = (𝑓𝑥) → 𝑡 = (𝑓𝑥))
2018, 19eleq12d 2887 . . . . . . . . . . . . 13 (𝑡 = (𝑓𝑥) → ((𝑔𝑡) ∈ 𝑡 ↔ (𝑔‘(𝑓𝑥)) ∈ (𝑓𝑥)))
2117, 20imbi12d 348 . . . . . . . . . . . 12 (𝑡 = (𝑓𝑥) → ((𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡) ↔ ((𝑓𝑥) ≠ ∅ → (𝑔‘(𝑓𝑥)) ∈ (𝑓𝑥))))
22 simplr 768 . . . . . . . . . . . 12 ((((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ ∀𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡)) ∧ 𝑥 ∈ dom 𝑓) → ∀𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡))
2310ad4ant14 751 . . . . . . . . . . . 12 ((((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ ∀𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡)) ∧ 𝑥 ∈ dom 𝑓) → (𝑓𝑥) ∈ ran 𝑓)
2421, 22, 23rspcdva 3576 . . . . . . . . . . 11 ((((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ ∀𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡)) ∧ 𝑥 ∈ dom 𝑓) → ((𝑓𝑥) ≠ ∅ → (𝑔‘(𝑓𝑥)) ∈ (𝑓𝑥)))
2516, 24mpd 15 . . . . . . . . . 10 ((((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ ∀𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡)) ∧ 𝑥 ∈ dom 𝑓) → (𝑔‘(𝑓𝑥)) ∈ (𝑓𝑥))
2625ralrimiva 3152 . . . . . . . . 9 (((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ ∀𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡)) → ∀𝑥 ∈ dom 𝑓(𝑔‘(𝑓𝑥)) ∈ (𝑓𝑥))
272dmex 7602 . . . . . . . . . 10 dom 𝑓 ∈ V
28 mptelixpg 8486 . . . . . . . . . 10 (dom 𝑓 ∈ V → ((𝑥 ∈ dom 𝑓 ↦ (𝑔‘(𝑓𝑥))) ∈ X𝑥 ∈ dom 𝑓(𝑓𝑥) ↔ ∀𝑥 ∈ dom 𝑓(𝑔‘(𝑓𝑥)) ∈ (𝑓𝑥)))
2927, 28ax-mp 5 . . . . . . . . 9 ((𝑥 ∈ dom 𝑓 ↦ (𝑔‘(𝑓𝑥))) ∈ X𝑥 ∈ dom 𝑓(𝑓𝑥) ↔ ∀𝑥 ∈ dom 𝑓(𝑔‘(𝑓𝑥)) ∈ (𝑓𝑥))
3026, 29sylibr 237 . . . . . . . 8 (((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ ∀𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡)) → (𝑥 ∈ dom 𝑓 ↦ (𝑔‘(𝑓𝑥))) ∈ X𝑥 ∈ dom 𝑓(𝑓𝑥))
3130ne0d 4254 . . . . . . 7 (((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ∧ ∀𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡)) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅)
3231ex 416 . . . . . 6 ((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → (∀𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅))
3332exlimdv 1934 . . . . 5 ((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → (∃𝑔𝑡 ∈ ran 𝑓(𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅))
346, 33syl5com 31 . . . 4 (∀𝑠𝑔𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡) → ((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅))
3534alrimiv 1928 . . 3 (∀𝑠𝑔𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡) → ∀𝑓((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅))
36 fnresi 6452 . . . . . . 7 ( I ↾ (𝑠 ∖ {∅})) Fn (𝑠 ∖ {∅})
37 fnfun 6427 . . . . . . 7 (( I ↾ (𝑠 ∖ {∅})) Fn (𝑠 ∖ {∅}) → Fun ( I ↾ (𝑠 ∖ {∅})))
3836, 37ax-mp 5 . . . . . 6 Fun ( I ↾ (𝑠 ∖ {∅}))
39 neldifsn 4688 . . . . . 6 ¬ ∅ ∈ (𝑠 ∖ {∅})
40 vex 3447 . . . . . . . . 9 𝑠 ∈ V
4140difexi 5199 . . . . . . . 8 (𝑠 ∖ {∅}) ∈ V
42 resiexg 7605 . . . . . . . 8 ((𝑠 ∖ {∅}) ∈ V → ( I ↾ (𝑠 ∖ {∅})) ∈ V)
4341, 42ax-mp 5 . . . . . . 7 ( I ↾ (𝑠 ∖ {∅})) ∈ V
44 funeq 6348 . . . . . . . . 9 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → (Fun 𝑓 ↔ Fun ( I ↾ (𝑠 ∖ {∅}))))
45 rneq 5774 . . . . . . . . . . . . 13 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → ran 𝑓 = ran ( I ↾ (𝑠 ∖ {∅})))
46 rnresi 5914 . . . . . . . . . . . . 13 ran ( I ↾ (𝑠 ∖ {∅})) = (𝑠 ∖ {∅})
4745, 46eqtrdi 2852 . . . . . . . . . . . 12 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → ran 𝑓 = (𝑠 ∖ {∅}))
4847eleq2d 2878 . . . . . . . . . . 11 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → (∅ ∈ ran 𝑓 ↔ ∅ ∈ (𝑠 ∖ {∅})))
4948notbid 321 . . . . . . . . . 10 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → (¬ ∅ ∈ ran 𝑓 ↔ ¬ ∅ ∈ (𝑠 ∖ {∅})))
507, 49syl5bb 286 . . . . . . . . 9 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → (∅ ∉ ran 𝑓 ↔ ¬ ∅ ∈ (𝑠 ∖ {∅})))
5144, 50anbi12d 633 . . . . . . . 8 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → ((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) ↔ (Fun ( I ↾ (𝑠 ∖ {∅})) ∧ ¬ ∅ ∈ (𝑠 ∖ {∅}))))
52 dmeq 5740 . . . . . . . . . . . 12 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → dom 𝑓 = dom ( I ↾ (𝑠 ∖ {∅})))
53 dmresi 5892 . . . . . . . . . . . 12 dom ( I ↾ (𝑠 ∖ {∅})) = (𝑠 ∖ {∅})
5452, 53eqtrdi 2852 . . . . . . . . . . 11 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → dom 𝑓 = (𝑠 ∖ {∅}))
5554ixpeq1d 8460 . . . . . . . . . 10 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → X𝑥 ∈ dom 𝑓(𝑓𝑥) = X𝑥 ∈ (𝑠 ∖ {∅})(𝑓𝑥))
56 fveq1 6648 . . . . . . . . . . . 12 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → (𝑓𝑥) = (( I ↾ (𝑠 ∖ {∅}))‘𝑥))
57 fvresi 6916 . . . . . . . . . . . 12 (𝑥 ∈ (𝑠 ∖ {∅}) → (( I ↾ (𝑠 ∖ {∅}))‘𝑥) = 𝑥)
5856, 57sylan9eq 2856 . . . . . . . . . . 11 ((𝑓 = ( I ↾ (𝑠 ∖ {∅})) ∧ 𝑥 ∈ (𝑠 ∖ {∅})) → (𝑓𝑥) = 𝑥)
5958ixpeq2dva 8463 . . . . . . . . . 10 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → X𝑥 ∈ (𝑠 ∖ {∅})(𝑓𝑥) = X𝑥 ∈ (𝑠 ∖ {∅})𝑥)
6055, 59eqtrd 2836 . . . . . . . . 9 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → X𝑥 ∈ dom 𝑓(𝑓𝑥) = X𝑥 ∈ (𝑠 ∖ {∅})𝑥)
6160neeq1d 3049 . . . . . . . 8 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → (X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅ ↔ X𝑥 ∈ (𝑠 ∖ {∅})𝑥 ≠ ∅))
6251, 61imbi12d 348 . . . . . . 7 (𝑓 = ( I ↾ (𝑠 ∖ {∅})) → (((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅) ↔ ((Fun ( I ↾ (𝑠 ∖ {∅})) ∧ ¬ ∅ ∈ (𝑠 ∖ {∅})) → X𝑥 ∈ (𝑠 ∖ {∅})𝑥 ≠ ∅)))
6343, 62spcv 3557 . . . . . 6 (∀𝑓((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅) → ((Fun ( I ↾ (𝑠 ∖ {∅})) ∧ ¬ ∅ ∈ (𝑠 ∖ {∅})) → X𝑥 ∈ (𝑠 ∖ {∅})𝑥 ≠ ∅))
6438, 39, 63mp2ani 697 . . . . 5 (∀𝑓((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅) → X𝑥 ∈ (𝑠 ∖ {∅})𝑥 ≠ ∅)
65 n0 4263 . . . . . 6 (X𝑥 ∈ (𝑠 ∖ {∅})𝑥 ≠ ∅ ↔ ∃𝑔 𝑔X𝑥 ∈ (𝑠 ∖ {∅})𝑥)
66 vex 3447 . . . . . . . . 9 𝑔 ∈ V
6766elixp 8455 . . . . . . . 8 (𝑔X𝑥 ∈ (𝑠 ∖ {∅})𝑥 ↔ (𝑔 Fn (𝑠 ∖ {∅}) ∧ ∀𝑥 ∈ (𝑠 ∖ {∅})(𝑔𝑥) ∈ 𝑥))
68 eldifsn 4683 . . . . . . . . . . . . 13 (𝑥 ∈ (𝑠 ∖ {∅}) ↔ (𝑥𝑠𝑥 ≠ ∅))
6968imbi1i 353 . . . . . . . . . . . 12 ((𝑥 ∈ (𝑠 ∖ {∅}) → (𝑔𝑥) ∈ 𝑥) ↔ ((𝑥𝑠𝑥 ≠ ∅) → (𝑔𝑥) ∈ 𝑥))
70 impexp 454 . . . . . . . . . . . 12 (((𝑥𝑠𝑥 ≠ ∅) → (𝑔𝑥) ∈ 𝑥) ↔ (𝑥𝑠 → (𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
7169, 70bitri 278 . . . . . . . . . . 11 ((𝑥 ∈ (𝑠 ∖ {∅}) → (𝑔𝑥) ∈ 𝑥) ↔ (𝑥𝑠 → (𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
7271ralbii2 3134 . . . . . . . . . 10 (∀𝑥 ∈ (𝑠 ∖ {∅})(𝑔𝑥) ∈ 𝑥 ↔ ∀𝑥𝑠 (𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥))
73 neeq1 3052 . . . . . . . . . . . 12 (𝑥 = 𝑡 → (𝑥 ≠ ∅ ↔ 𝑡 ≠ ∅))
74 fveq2 6649 . . . . . . . . . . . . 13 (𝑥 = 𝑡 → (𝑔𝑥) = (𝑔𝑡))
75 id 22 . . . . . . . . . . . . 13 (𝑥 = 𝑡𝑥 = 𝑡)
7674, 75eleq12d 2887 . . . . . . . . . . . 12 (𝑥 = 𝑡 → ((𝑔𝑥) ∈ 𝑥 ↔ (𝑔𝑡) ∈ 𝑡))
7773, 76imbi12d 348 . . . . . . . . . . 11 (𝑥 = 𝑡 → ((𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥) ↔ (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡)))
7877cbvralvw 3399 . . . . . . . . . 10 (∀𝑥𝑠 (𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥) ↔ ∀𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡))
7972, 78bitri 278 . . . . . . . . 9 (∀𝑥 ∈ (𝑠 ∖ {∅})(𝑔𝑥) ∈ 𝑥 ↔ ∀𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡))
8079biimpi 219 . . . . . . . 8 (∀𝑥 ∈ (𝑠 ∖ {∅})(𝑔𝑥) ∈ 𝑥 → ∀𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡))
8167, 80simplbiim 508 . . . . . . 7 (𝑔X𝑥 ∈ (𝑠 ∖ {∅})𝑥 → ∀𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡))
8281eximi 1836 . . . . . 6 (∃𝑔 𝑔X𝑥 ∈ (𝑠 ∖ {∅})𝑥 → ∃𝑔𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡))
8365, 82sylbi 220 . . . . 5 (X𝑥 ∈ (𝑠 ∖ {∅})𝑥 ≠ ∅ → ∃𝑔𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡))
8464, 83syl 17 . . . 4 (∀𝑓((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅) → ∃𝑔𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡))
8584alrimiv 1928 . . 3 (∀𝑓((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅) → ∀𝑠𝑔𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡))
8635, 85impbii 212 . 2 (∀𝑠𝑔𝑡𝑠 (𝑡 ≠ ∅ → (𝑔𝑡) ∈ 𝑡) ↔ ∀𝑓((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅))
871, 86bitri 278 1 (CHOICE ↔ ∀𝑓((Fun 𝑓 ∧ ∅ ∉ ran 𝑓) → X𝑥 ∈ dom 𝑓(𝑓𝑥) ≠ ∅))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 209   ∧ wa 399  ∀wal 1536   = wceq 1538  ∃wex 1781   ∈ wcel 2112   ≠ wne 2990   ∉ wnel 3094  ∀wral 3109  Vcvv 3444   ∖ cdif 3881  ∅c0 4246  {csn 4528   ↦ cmpt 5113   I cid 5427  dom cdm 5523  ran crn 5524   ↾ cres 5525  Fun wfun 6322   Fn wfn 6323  ‘cfv 6328  Xcixp 8448  CHOICEwac 9530 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2159  ax-12 2176  ax-ext 2773  ax-rep 5157  ax-sep 5170  ax-nul 5177  ax-pow 5234  ax-pr 5298  ax-un 7445 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2601  df-eu 2632  df-clab 2780  df-cleq 2794  df-clel 2873  df-nfc 2941  df-ne 2991  df-nel 3095  df-ral 3114  df-rex 3115  df-reu 3116  df-rab 3118  df-v 3446  df-sbc 3724  df-csb 3832  df-dif 3887  df-un 3889  df-in 3891  df-ss 3901  df-nul 4247  df-if 4429  df-pw 4502  df-sn 4529  df-pr 4531  df-op 4535  df-uni 4804  df-iun 4886  df-br 5034  df-opab 5096  df-mpt 5114  df-id 5428  df-xp 5529  df-rel 5530  df-cnv 5531  df-co 5532  df-dm 5533  df-rn 5534  df-res 5535  df-ima 5536  df-iota 6287  df-fun 6330  df-fn 6331  df-f 6332  df-f1 6333  df-fo 6334  df-f1o 6335  df-fv 6336  df-ixp 8449  df-ac 9531 This theorem is referenced by:  dfac14  22227  dfac21  40007
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