Theorem domfnex 5871

Description: The domain function is stratified. (Contributed by Scott Fenton, 9-Aug-2019.)

Assertion

Ref	Expression
domfnex	|- Dom e. _V

Proof of Theorem domfnex

Dummy variables x y z w are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-domfn 5771	. . 3 |- Dom = (x e. _V |-> dom x)
2		elin 3220	. . . . . . . . 9 |- (<.{w}, <.{z}, <.{y}, x>.>.>. e. ( Ins4 SI3 Swap i^i Ins2 Ins2 S ) <-> (<.{w}, <.{z}, <.{y}, x>.>.>. e. Ins4 SI3 Swap /\ <.{w}, <.{z}, <.{y}, x>.>.>. e. Ins2 Ins2 S ))
3		vex 2863	. . . . . . . . . . . 12 |- x e. _V
4	3	oqelins4 5795	. . . . . . . . . . 11 |- (<.{w}, <.{z}, <.{y}, x>.>.>. e. Ins4 SI3 Swap <-> <.{w}, <.{z}, {y}>.>. e. SI3 Swap )
5		vex 2863	. . . . . . . . . . . . 13 |- w e. _V
6		vex 2863	. . . . . . . . . . . . 13 |- z e. _V
7		vex 2863	. . . . . . . . . . . . 13 |- y e. _V
8	5, 6, 7	otsnelsi3 5806	. . . . . . . . . . . 12 |- (<.{w}, <.{z}, {y}>.>. e. SI3 Swap <-> <.w, <.z, y>.>. e. Swap )
9		df-br 4641	. . . . . . . . . . . 12 |- (w Swap <.z, y>. <-> <.w, <.z, y>.>. e. Swap )
10	6, 7	brswap2 4861	. . . . . . . . . . . 12 |- (w Swap <.z, y>. <-> w = <.y, z>.)
11	8, 9, 10	3bitr2i 264	. . . . . . . . . . 11 |- (<.{w}, <.{z}, {y}>.>. e. SI3 Swap <-> w = <.y, z>.)
12	4, 11	bitri 240	. . . . . . . . . 10 |- (<.{w}, <.{z}, <.{y}, x>.>.>. e. Ins4 SI3 Swap <-> w = <.y, z>.)
13		snex 4112	. . . . . . . . . . . 12 |- {z} e. _V
14	13	otelins2 5792	. . . . . . . . . . 11 |- (<.{w}, <.{z}, <.{y}, x>.>.>. e. Ins2 Ins2 S <-> <.{w}, <.{y}, x>.>. e. Ins2 S )
15		snex 4112	. . . . . . . . . . . . 13 |- {y} e. _V
16	15	otelins2 5792	. . . . . . . . . . . 12 |- (<.{w}, <.{y}, x>.>. e. Ins2 S <-> <.{w}, x>. e. S )
17	5, 3	opelssetsn 4761	. . . . . . . . . . . 12 |- (<.{w}, x>. e. S <-> w e. x)
18	16, 17	bitri 240	. . . . . . . . . . 11 |- (<.{w}, <.{y}, x>.>. e. Ins2 S <-> w e. x)
19	14, 18	bitri 240	. . . . . . . . . 10 |- (<.{w}, <.{z}, <.{y}, x>.>.>. e. Ins2 Ins2 S <-> w e. x)
20	12, 19	anbi12i 678	. . . . . . . . 9 |- ((<.{w}, <.{z}, <.{y}, x>.>.>. e. Ins4 SI3 Swap /\ <.{w}, <.{z}, <.{y}, x>.>.>. e. Ins2 Ins2 S ) <-> (w = <.y, z>. /\ w e. x))
21	2, 20	bitri 240	. . . . . . . 8 |- (<.{w}, <.{z}, <.{y}, x>.>.>. e. ( Ins4 SI3 Swap i^i Ins2 Ins2 S ) <-> (w = <.y, z>. /\ w e. x))
22	21	exbii 1582	. . . . . . 7 |- (E.w<.{w}, <.{z}, <.{y}, x>.>.>. e. ( Ins4 SI3 Swap i^i Ins2 Ins2 S ) <-> E.w(w = <.y, z>. /\ w e. x))
23		elima1c 4948	. . . . . . 7 |- (<.{z}, <.{y}, x>.>. e. (( Ins4 SI3 Swap i^i Ins2 Ins2 S )"1c) <-> E.w<.{w}, <.{z}, <.{y}, x>.>.>. e. ( Ins4 SI3 Swap i^i Ins2 Ins2 S ))
24		df-clel 2349	. . . . . . 7 |- (<.y, z>. e. x <-> E.w(w = <.y, z>. /\ w e. x))
25	22, 23, 24	3bitr4i 268	. . . . . 6 |- (<.{z}, <.{y}, x>.>. e. (( Ins4 SI3 Swap i^i Ins2 Ins2 S )"1c) <-> <.y, z>. e. x)
26	25	exbii 1582	. . . . 5 |- (E.z<.{z}, <.{y}, x>.>. e. (( Ins4 SI3 Swap i^i Ins2 Ins2 S )"1c) <-> E.z<.y, z>. e. x)
27		elima1c 4948	. . . . 5 |- (<.{y}, x>. e. ((( Ins4 SI3 Swap i^i Ins2 Ins2 S )"1c)"1c) <-> E.z<.{z}, <.{y}, x>.>. e. (( Ins4 SI3 Swap i^i Ins2 Ins2 S )"1c))
28		eldm2 4900	. . . . 5 |- (y e. dom x <-> E.z<.y, z>. e. x)
29	26, 27, 28	3bitr4i 268	. . . 4 |- (<.{y}, x>. e. ((( Ins4 SI3 Swap i^i Ins2 Ins2 S )"1c)"1c) <-> y e. dom x)
30	29	releqmpt 5809	. . 3 |- ((_V X. _V) i^i `' ∼ (( Ins3 S (+) Ins2 ((( Ins4 SI3 Swap i^i Ins2 Ins2 S )"1c)"1c))"1c)) = (x e. _V |-> dom x)
31	1, 30	eqtr4i 2376	. 2 |- Dom = ((_V X. _V) i^i `' ∼ (( Ins3 S (+) Ins2 ((( Ins4 SI3 Swap i^i Ins2 Ins2 S )"1c)"1c))"1c))
32		vvex 4110	. . 3 |- _V e. _V
33		swapex 4743	. . . . . . . 8 |- Swap e. _V
34	33	si3ex 5807	. . . . . . 7 |- SI3 Swap e. _V
35	34	ins4ex 5800	. . . . . 6 |- Ins4 SI3 Swap e. _V
36		ssetex 4745	. . . . . . . 8 |- S e. _V
37	36	ins2ex 5798	. . . . . . 7 |- Ins2 S e. _V
38	37	ins2ex 5798	. . . . . 6 |- Ins2 Ins2 S e. _V
39	35, 38	inex 4106	. . . . 5 |- ( Ins4 SI3 Swap i^i Ins2 Ins2 S ) e. _V
40		1cex 4143	. . . . 5 |- 1c e. _V
41	39, 40	imaex 4748	. . . 4 |- (( Ins4 SI3 Swap i^i Ins2 Ins2 S )"1c) e. _V
42	41, 40	imaex 4748	. . 3 |- ((( Ins4 SI3 Swap i^i Ins2 Ins2 S )"1c)"1c) e. _V
43	32, 42	mptexlem 5811	. 2 |- ((_V X. _V) i^i `' ∼ (( Ins3 S (+) Ins2 ((( Ins4 SI3 Swap i^i Ins2 Ins2 S )"1c)"1c))"1c)) e. _V
44	31, 43	eqeltri 2423	1 |- Dom e. _V

Syntax hints:   /\ wa 358  E.wex 1541   = wceq 1642   e. wcel 1710  _Vcvv 2860   ∼ ccompl 3206   i^i cin 3209   (+) csymdif 3210  {csn 3738  1_cc1c 4135  <.cop 4562   class class class wbr 4640   Swap cswap 4719   S csset 4720  "cima 4723   X. cxp 4771  `'ccnv 4772  dom cdm 4773   |-> cmpt 5652   Ins2 cins2 5750   Ins3 cins3 5752   Ins4 cins4 5756   SI₃ csi3 5758   Dom cdomfn 5770

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-13 1712  ax-14 1714  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4079  ax-xp 4080  ax-cnv 4081  ax-1c 4082  ax-sset 4083  ax-si 4084  ax-ins2 4085  ax-ins3 4086  ax-typlower 4087  ax-sn 4088

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2208  df-mo 2209  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2479  df-ne 2519  df-ral 2620  df-rex 2621  df-reu 2622  df-rmo 2623  df-rab 2624  df-v 2862  df-sbc 3048  df-nin 3212  df-compl 3213  df-in 3214  df-un 3215  df-dif 3216  df-symdif 3217  df-ss 3260  df-pss 3262  df-nul 3552  df-if 3664  df-pw 3725  df-sn 3742  df-pr 3743  df-uni 3893  df-int 3928  df-opk 4059  df-1c 4137  df-pw1 4138  df-uni1 4139  df-xpk 4186  df-cnvk 4187  df-ins2k 4188  df-ins3k 4189  df-imak 4190  df-cok 4191  df-p6 4192  df-sik 4193  df-ssetk 4194  df-imagek 4195  df-idk 4196  df-iota 4340  df-0c 4378  df-addc 4379  df-nnc 4380  df-fin 4381  df-lefin 4441  df-ltfin 4442  df-ncfin 4443  df-tfin 4444  df-evenfin 4445  df-oddfin 4446  df-sfin 4447  df-spfin 4448  df-phi 4566  df-op 4567  df-proj1 4568  df-proj2 4569  df-opab 4624  df-br 4641  df-1st 4724  df-swap 4725  df-sset 4726  df-co 4727  df-ima 4728  df-si 4729  df-xp 4785  df-cnv 4786  df-rn 4787  df-dm 4788  df-2nd 4798  df-mpt 5653  df-txp 5737  df-ins2 5751  df-ins3 5753  df-ins4 5757  df-si3 5759  df-domfn 5771

This theorem is referenced by: (None)