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Theorem dffin7-2 10515

Description: Class form of isfin7-2 10513. (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 867	. . 3 ⊢ ((𝑥 ∈ dom card → 𝑥 ∈ Fin) ↔ (¬ 𝑥 ∈ dom card ∨ 𝑥 ∈ Fin))
2		isfin7-2 10513	. . . 4 ⊢ (𝑥 ∈ V → (𝑥 ∈ Fin^VII ↔ (𝑥 ∈ dom card → 𝑥 ∈ Fin)))
3	2	elv 3459	. . 3 ⊢ (𝑥 ∈ Fin^VII ↔ (𝑥 ∈ dom card → 𝑥 ∈ Fin))
4		elun 4155	. . . 4 ⊢ (𝑥 ∈ (Fin ∪ (V ∖ dom card)) ↔ (𝑥 ∈ Fin ∨ 𝑥 ∈ (V ∖ dom card)))
5		orcom 884	. . . 4 ⊢ ((𝑥 ∈ Fin ∨ 𝑥 ∈ (V ∖ dom card)) ↔ (𝑥 ∈ (V ∖ dom card) ∨ 𝑥 ∈ Fin))
6		vex 3458	. . . . . 6 ⊢ 𝑥 ∈ V
7		eldif 4052	. . . . . 6 ⊢ (𝑥 ∈ (V ∖ dom card) ↔ (𝑥 ∈ V ∧ ¬ 𝑥 ∈ dom card))
8	6, 7	mpbiran 722	. . . . 5 ⊢ (𝑥 ∈ (V ∖ dom card) ↔ ¬ 𝑥 ∈ dom card)
9	8	orbi1i 927	. . . 4 ⊢ ((𝑥 ∈ (V ∖ dom card) ∨ 𝑥 ∈ Fin) ↔ (¬ 𝑥 ∈ dom card ∨ 𝑥 ∈ Fin))
10	4, 5, 9	3bitri 300	. . 3 ⊢ (𝑥 ∈ (Fin ∪ (V ∖ dom card)) ↔ (¬ 𝑥 ∈ dom card ∨ 𝑥 ∈ Fin))
11	1, 3, 10	3bitr4i 306	. 2 ⊢ (𝑥 ∈ Fin^VII ↔ 𝑥 ∈ (Fin ∪ (V ∖ dom card)))
12	11	eqriv 2760	1 ⊢ Fin^VII = (Fin ∪ (V ∖ dom card))

Colors of variables: wff setvar class

This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∨ wo 861 = wceq 1570 ∈ wcel 2147 Vcvv 3454 ∖ cdif 4048 ∪ cun 4152 dom cdm 5658 Fincfn 9011 cardccrd 10053 Fin^VIIcfin7 10401

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-int 4913 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-ord 6391 df-on 6392 df-lim 6393 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-om 7912 df-1o 8514 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-fin 9015 df-card 10057 df-fin7 10408

This theorem is used by: dfacfin7 10516

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