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Theorem dffin7-2 10438

Description: Class form of isfin7-2 10436. (Contributed by Mario Carneiro, 17-May-2015.)

**Assertion**
Ref	Expression
dffin7-2	⊢ Fin^VII = (Fin ∪ (V ∖ dom card))

**Proof of Theorem dffin7-2**
Step	Hyp	Ref	Expression
1		imor 854	. . 3 ⊢ ((𝑥 ∈ dom card → 𝑥 ∈ Fin) ↔ (¬ 𝑥 ∈ dom card ∨ 𝑥 ∈ Fin))
2		isfin7-2 10436	. . . 4 ⊢ (𝑥 ∈ V → (𝑥 ∈ Fin^VII ↔ (𝑥 ∈ dom card → 𝑥 ∈ Fin)))
3	2	elv 3485	. . 3 ⊢ (𝑥 ∈ Fin^VII ↔ (𝑥 ∈ dom card → 𝑥 ∈ Fin))
4		elun 4153	. . . 4 ⊢ (𝑥 ∈ (Fin ∪ (V ∖ dom card)) ↔ (𝑥 ∈ Fin ∨ 𝑥 ∈ (V ∖ dom card)))
5		orcom 871	. . . 4 ⊢ ((𝑥 ∈ Fin ∨ 𝑥 ∈ (V ∖ dom card)) ↔ (𝑥 ∈ (V ∖ dom card) ∨ 𝑥 ∈ Fin))
6		vex 3484	. . . . . 6 ⊢ 𝑥 ∈ V
7		eldif 3961	. . . . . 6 ⊢ (𝑥 ∈ (V ∖ dom card) ↔ (𝑥 ∈ V ∧ ¬ 𝑥 ∈ dom card))
8	6, 7	mpbiran 709	. . . . 5 ⊢ (𝑥 ∈ (V ∖ dom card) ↔ ¬ 𝑥 ∈ dom card)
9	8	orbi1i 914	. . . 4 ⊢ ((𝑥 ∈ (V ∖ dom card) ∨ 𝑥 ∈ Fin) ↔ (¬ 𝑥 ∈ dom card ∨ 𝑥 ∈ Fin))
10	4, 5, 9	3bitri 297	. . 3 ⊢ (𝑥 ∈ (Fin ∪ (V ∖ dom card)) ↔ (¬ 𝑥 ∈ dom card ∨ 𝑥 ∈ Fin))
11	1, 3, 10	3bitr4i 303	. 2 ⊢ (𝑥 ∈ Fin^VII ↔ 𝑥 ∈ (Fin ∪ (V ∖ dom card)))
12	11	eqriv 2734	1 ⊢ Fin^VII = (Fin ∪ (V ∖ dom card))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∨ wo 848 = wceq 1540 ∈ wcel 2108 Vcvv 3480 ∖ cdif 3948 ∪ cun 3949 dom cdm 5685 Fincfn 8985 cardccrd 9975 Fin^VIIcfin7 10324

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-ral 3062 df-rex 3071 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-int 4947 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-ord 6387 df-on 6388 df-lim 6389 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-om 7888 df-1o 8506 df-er 8745 df-en 8986 df-dom 8987 df-sdom 8988 df-fin 8989 df-card 9979 df-fin7 10331

This theorem is referenced by: dfacfin7 10439

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