Theorem pw1fin 7185

Description: Excluded middle is equivalent to the power set of 1o being finite. (Contributed by SN and Jim Kingdon, 7-Aug-2024.)

Assertion

Ref	Expression
pw1fin	|- (EXMID <-> ~P 1o e. Fin )

Proof of Theorem pw1fin

Step	Hyp	Ref	Expression
1		exmidpweq 7184	. . . 4 |- (EXMID <-> ~P 1o = 2o )
2	1	biimpi 120	. . 3 |- (EXMID -> ~P 1o = 2o )
3		2onn 6769	. . . 4 |- 2o e. om
4		nnfi 7142	. . . 4 |- ( 2o e. om -> 2o e. Fin )
5	3, 4	ax-mp 5	. . 3 |- 2o e. Fin
6	2, 5	eqeltrdi 2325	. 2 |- (EXMID -> ~P 1o e. Fin )
7		df1o2 6676	. . . . . 6 |- 1o = { (/) }
8	7	sseq2i 3269	. . . . 5 |- ( x C_ 1o <-> x C_ { (/) } )
9		velpw 3682	. . . . . 6 |- ( x e. ~P 1o <-> x C_ 1o )
10		1oex 6670	. . . . . . . 8 |- 1o e. _V
11	10	pwid 3693	. . . . . . 7 |- 1o e. ~P 1o
12		fidceq 7139	. . . . . . 7 |- ( ( ~P 1o e. Fin /\ x e. ~P 1o /\ 1o e. ~P 1o ) -> DECID x = 1o )
13	11, 12	mp3an3 1363	. . . . . 6 |- ( ( ~P 1o e. Fin /\ x e. ~P 1o ) -> DECID x = 1o )
14	9, 13	sylan2br 288	. . . . 5 |- ( ( ~P 1o e. Fin /\ x C_ 1o ) -> DECID x = 1o )
15	8, 14	sylan2br 288	. . . 4 |- ( ( ~P 1o e. Fin /\ x C_ { (/) } ) -> DECID x = 1o )
16	7	eqeq2i 2245	. . . . 5 |- ( x = 1o <-> x = { (/) } )
17	16	dcbii 848	. . . 4 |- (DECID x = 1o <-> DECID x = { (/) } )
18	15, 17	sylib 122	. . 3 |- ( ( ~P 1o e. Fin /\ x C_ { (/) } ) -> DECID x = { (/) } )
19	18	exmid1dc 4319	. 2 |- ( ~P 1o e. Fin -> EXMID )
20	6, 19	impbii 126	1 |- (EXMID <-> ~P 1o e. Fin )

Syntax hints:   /\ wa 104   <-> wb 105  DECID wdc 842   = wceq 1398   e. wcel 2205   C_ wss 3214   (/)c0 3512   ~Pcpw 3675   {csn 3695  EXMIDwem 4313   omcom 4719   1oc1o 6655   2oc2o 6656   Fincfn 6990

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4234  ax-nul 4242  ax-pow 4293  ax-pr 4328  ax-un 4560  ax-setind 4666  ax-iinf 4717

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-v 2817  df-sbc 3046  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3677  df-sn 3701  df-pr 3702  df-op 3704  df-uni 3921  df-int 3956  df-br 4116  df-opab 4178  df-tr 4215  df-exmid 4314  df-id 4420  df-iord 4493  df-on 4495  df-suc 4498  df-iom 4720  df-xp 4762  df-rel 4763  df-cnv 4764  df-co 4765  df-dm 4766  df-rn 4767  df-res 4768  df-ima 4769  df-iota 5319  df-fun 5361  df-fn 5362  df-f 5363  df-f1 5364  df-fo 5365  df-f1o 5366  df-fv 5367  df-1o 6662  df-2o 6663  df-en 6991  df-fin 6993

This theorem is referenced by: (None)