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Theorem dffin7-2 10351

Description: Class form of isfin7-2 10349. (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 853	. . 3 ⊢ ((𝑥 ∈ dom card → 𝑥 ∈ Fin) ↔ (¬ 𝑥 ∈ dom card ∨ 𝑥 ∈ Fin))
2		isfin7-2 10349	. . . 4 ⊢ (𝑥 ∈ V → (𝑥 ∈ Fin^VII ↔ (𝑥 ∈ dom card → 𝑥 ∈ Fin)))
3	2	elv 3452	. . 3 ⊢ (𝑥 ∈ Fin^VII ↔ (𝑥 ∈ dom card → 𝑥 ∈ Fin))
4		elun 4116	. . . 4 ⊢ (𝑥 ∈ (Fin ∪ (V ∖ dom card)) ↔ (𝑥 ∈ Fin ∨ 𝑥 ∈ (V ∖ dom card)))
5		orcom 870	. . . 4 ⊢ ((𝑥 ∈ Fin ∨ 𝑥 ∈ (V ∖ dom card)) ↔ (𝑥 ∈ (V ∖ dom card) ∨ 𝑥 ∈ Fin))
6		vex 3451	. . . . . 6 ⊢ 𝑥 ∈ V
7		eldif 3924	. . . . . 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 913	. . . 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 2726	1 ⊢ Fin^VII = (Fin ∪ (V ∖ dom card))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∨ wo 847 = wceq 1540 ∈ wcel 2109 Vcvv 3447 ∖ cdif 3911 ∪ cun 3912 dom cdm 5638 Fincfn 8918 cardccrd 9888 Fin^VIIcfin7 10237

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 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5251 ax-nul 5261 ax-pow 5320 ax-pr 5387 ax-un 7711

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-ral 3045 df-rex 3054 df-reu 3355 df-rab 3406 df-v 3449 df-sbc 3754 df-csb 3863 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3934 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-int 4911 df-br 5108 df-opab 5170 df-mpt 5189 df-tr 5215 df-id 5533 df-eprel 5538 df-po 5546 df-so 5547 df-fr 5591 df-we 5593 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-res 5650 df-ima 5651 df-ord 6335 df-on 6336 df-lim 6337 df-suc 6338 df-iota 6464 df-fun 6513 df-fn 6514 df-f 6515 df-f1 6516 df-fo 6517 df-f1o 6518 df-fv 6519 df-om 7843 df-1o 8434 df-er 8671 df-en 8919 df-dom 8920 df-sdom 8921 df-fin 8922 df-card 9892 df-fin7 10244

This theorem is referenced by: dfacfin7 10352

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