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Theorem dffin7-2 10138

Description: Class form of isfin7-2 10136. (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 849	. . 3 ⊢ ((𝑥 ∈ dom card → 𝑥 ∈ Fin) ↔ (¬ 𝑥 ∈ dom card ∨ 𝑥 ∈ Fin))
2		isfin7-2 10136	. . . 4 ⊢ (𝑥 ∈ V → (𝑥 ∈ Fin^VII ↔ (𝑥 ∈ dom card → 𝑥 ∈ Fin)))
3	2	elv 3436	. . 3 ⊢ (𝑥 ∈ Fin^VII ↔ (𝑥 ∈ dom card → 𝑥 ∈ Fin))
4		elun 4087	. . . 4 ⊢ (𝑥 ∈ (Fin ∪ (V ∖ dom card)) ↔ (𝑥 ∈ Fin ∨ 𝑥 ∈ (V ∖ dom card)))
5		orcom 866	. . . 4 ⊢ ((𝑥 ∈ Fin ∨ 𝑥 ∈ (V ∖ dom card)) ↔ (𝑥 ∈ (V ∖ dom card) ∨ 𝑥 ∈ Fin))
6		vex 3434	. . . . . 6 ⊢ 𝑥 ∈ V
7		eldif 3901	. . . . . 6 ⊢ (𝑥 ∈ (V ∖ dom card) ↔ (𝑥 ∈ V ∧ ¬ 𝑥 ∈ dom card))
8	6, 7	mpbiran 705	. . . . 5 ⊢ (𝑥 ∈ (V ∖ dom card) ↔ ¬ 𝑥 ∈ dom card)
9	8	orbi1i 910	. . . 4 ⊢ ((𝑥 ∈ (V ∖ dom card) ∨ 𝑥 ∈ Fin) ↔ (¬ 𝑥 ∈ dom card ∨ 𝑥 ∈ Fin))
10	4, 5, 9	3bitri 296	. . 3 ⊢ (𝑥 ∈ (Fin ∪ (V ∖ dom card)) ↔ (¬ 𝑥 ∈ dom card ∨ 𝑥 ∈ Fin))
11	1, 3, 10	3bitr4i 302	. 2 ⊢ (𝑥 ∈ Fin^VII ↔ 𝑥 ∈ (Fin ∪ (V ∖ dom card)))
12	11	eqriv 2736	1 ⊢ Fin^VII = (Fin ∪ (V ∖ dom card))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∨ wo 843 = wceq 1541 ∈ wcel 2109 Vcvv 3430 ∖ cdif 3888 ∪ cun 3889 dom cdm 5588 Fincfn 8707 cardccrd 9677 Fin^VIIcfin7 10024

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1801 ax-4 1815 ax-5 1916 ax-6 1974 ax-7 2014 ax-8 2111 ax-9 2119 ax-10 2140 ax-11 2157 ax-12 2174 ax-ext 2710 ax-sep 5226 ax-nul 5233 ax-pow 5291 ax-pr 5355 ax-un 7579

This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1544 df-fal 1554 df-ex 1786 df-nf 1790 df-sb 2071 df-mo 2541 df-eu 2570 df-clab 2717 df-cleq 2731 df-clel 2817 df-nfc 2890 df-ne 2945 df-ral 3070 df-rex 3071 df-reu 3072 df-rab 3074 df-v 3432 df-sbc 3720 df-csb 3837 df-dif 3894 df-un 3896 df-in 3898 df-ss 3908 df-pss 3910 df-nul 4262 df-if 4465 df-pw 4540 df-sn 4567 df-pr 4569 df-tp 4571 df-op 4573 df-uni 4845 df-int 4885 df-br 5079 df-opab 5141 df-mpt 5162 df-tr 5196 df-id 5488 df-eprel 5494 df-po 5502 df-so 5503 df-fr 5543 df-we 5545 df-xp 5594 df-rel 5595 df-cnv 5596 df-co 5597 df-dm 5598 df-rn 5599 df-res 5600 df-ima 5601 df-ord 6266 df-on 6267 df-lim 6268 df-suc 6269 df-iota 6388 df-fun 6432 df-fn 6433 df-f 6434 df-f1 6435 df-fo 6436 df-f1o 6437 df-fv 6438 df-om 7701 df-1o 8281 df-er 8472 df-en 8708 df-dom 8709 df-sdom 8710 df-fin 8711 df-card 9681 df-fin7 10031

This theorem is referenced by: dfacfin7 10139

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