Theorem 2lgslem1b 15847

Description: Lemma 2 for 2lgslem1 15849. (Contributed by AV, 18-Jun-2021.)

Hypotheses

Ref	Expression
2lgslem1b.i	|- I = ( A ... B )
2lgslem1b.f	|- F = ( j e. I |-> ( j x. 2 ) )

Assertion

Ref	Expression
2lgslem1b	|- F : I -1-1-onto-> { x e. ZZ | E. i e. I x = ( i x. 2 ) }

Distinct variable group:   i, I, j, x

Allowed substitution hints:   A( x, i, j)   B( x, i, j)   F( x, i, j)

Proof of Theorem 2lgslem1b

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

Step	Hyp	Ref	Expression
1		2lgslem1b.f	. . . 4 |- F = ( j e. I |-> ( j x. 2 ) )
2		eqeq1 2237	. . . . . 6 |- ( x = ( j x. 2 ) -> ( x = ( i x. 2 ) <-> ( j x. 2 ) = ( i x. 2 ) ) )
3	2	rexbidv 2532	. . . . 5 |- ( x = ( j x. 2 ) -> ( E. i e. I x = ( i x. 2 ) <-> E. i e. I ( j x. 2 ) = ( i x. 2 ) ) )
4		elfzelz 10265	. . . . . . 7 |- ( j e. ( A ... B ) -> j e. ZZ )
5		2lgslem1b.i	. . . . . . 7 |- I = ( A ... B )
6	4, 5	eleq2s 2325	. . . . . 6 |- ( j e. I -> j e. ZZ )
7		2z 9512	. . . . . . 7 |- 2 e. ZZ
8	7	a1i 9	. . . . . 6 |- ( j e. I -> 2 e. ZZ )
9	6, 8	zmulcld 9613	. . . . 5 |- ( j e. I -> ( j x. 2 ) e. ZZ )
10		id 19	. . . . . 6 |- ( j e. I -> j e. I )
11		oveq1 6030	. . . . . . . 8 |- ( i = j -> ( i x. 2 ) = ( j x. 2 ) )
12	11	eqeq2d 2242	. . . . . . 7 |- ( i = j -> ( ( j x. 2 ) = ( i x. 2 ) <-> ( j x. 2 ) = ( j x. 2 ) ) )
13	12	adantl 277	. . . . . 6 |- ( ( j e. I /\ i = j ) -> ( ( j x. 2 ) = ( i x. 2 ) <-> ( j x. 2 ) = ( j x. 2 ) ) )
14		eqidd 2231	. . . . . 6 |- ( j e. I -> ( j x. 2 ) = ( j x. 2 ) )
15	10, 13, 14	rspcedvd 2915	. . . . 5 |- ( j e. I -> E. i e. I ( j x. 2 ) = ( i x. 2 ) )
16	3, 9, 15	elrabd 2963	. . . 4 |- ( j e. I -> ( j x. 2 ) e. { x e. ZZ | E. i e. I x = ( i x. 2 ) } )
17	1, 16	fmpti 5802	. . 3 |- F : I --> { x e. ZZ | E. i e. I x = ( i x. 2 ) }
18		oveq1 6030	. . . . . . 7 |- ( j = y -> ( j x. 2 ) = ( y x. 2 ) )
19		simpl 109	. . . . . . 7 |- ( ( y e. I /\ z e. I ) -> y e. I )
20		elfzelz 10265	. . . . . . . . . 10 |- ( y e. ( A ... B ) -> y e. ZZ )
21	20, 5	eleq2s 2325	. . . . . . . . 9 |- ( y e. I -> y e. ZZ )
22		id 19	. . . . . . . . . 10 |- ( y e. ZZ -> y e. ZZ )
23	7	a1i 9	. . . . . . . . . 10 |- ( y e. ZZ -> 2 e. ZZ )
24	22, 23	zmulcld 9613	. . . . . . . . 9 |- ( y e. ZZ -> ( y x. 2 ) e. ZZ )
25	21, 24	syl 14	. . . . . . . 8 |- ( y e. I -> ( y x. 2 ) e. ZZ )
26	25	adantr 276	. . . . . . 7 |- ( ( y e. I /\ z e. I ) -> ( y x. 2 ) e. ZZ )
27	1, 18, 19, 26	fvmptd3 5743	. . . . . 6 |- ( ( y e. I /\ z e. I ) -> ( F ` y ) = ( y x. 2 ) )
28		oveq1 6030	. . . . . . 7 |- ( j = z -> ( j x. 2 ) = ( z x. 2 ) )
29		simpr 110	. . . . . . 7 |- ( ( y e. I /\ z e. I ) -> z e. I )
30		elfzelz 10265	. . . . . . . . . 10 |- ( z e. ( A ... B ) -> z e. ZZ )
31	30, 5	eleq2s 2325	. . . . . . . . 9 |- ( z e. I -> z e. ZZ )
32	7	a1i 9	. . . . . . . . 9 |- ( z e. I -> 2 e. ZZ )
33	31, 32	zmulcld 9613	. . . . . . . 8 |- ( z e. I -> ( z x. 2 ) e. ZZ )
34	33	adantl 277	. . . . . . 7 |- ( ( y e. I /\ z e. I ) -> ( z x. 2 ) e. ZZ )
35	1, 28, 29, 34	fvmptd3 5743	. . . . . 6 |- ( ( y e. I /\ z e. I ) -> ( F ` z ) = ( z x. 2 ) )
36	27, 35	eqeq12d 2245	. . . . 5 |- ( ( y e. I /\ z e. I ) -> ( ( F ` y ) = ( F ` z ) <-> ( y x. 2 ) = ( z x. 2 ) ) )
37	21	zcnd 9608	. . . . . . . 8 |- ( y e. I -> y e. CC )
38	37	adantr 276	. . . . . . 7 |- ( ( y e. I /\ z e. I ) -> y e. CC )
39	31	zcnd 9608	. . . . . . . 8 |- ( z e. I -> z e. CC )
40	39	adantl 277	. . . . . . 7 |- ( ( y e. I /\ z e. I ) -> z e. CC )
41		2cnd 9221	. . . . . . 7 |- ( ( y e. I /\ z e. I ) -> 2 e. CC )
42		2ap0 9241	. . . . . . . 8 |- 2 # 0
43	42	a1i 9	. . . . . . 7 |- ( ( y e. I /\ z e. I ) -> 2 # 0 )
44	38, 40, 41, 43	mulcanap2d 8847	. . . . . 6 |- ( ( y e. I /\ z e. I ) -> ( ( y x. 2 ) = ( z x. 2 ) <-> y = z ) )
45	44	biimpd 144	. . . . 5 |- ( ( y e. I /\ z e. I ) -> ( ( y x. 2 ) = ( z x. 2 ) -> y = z ) )
46	36, 45	sylbid 150	. . . 4 |- ( ( y e. I /\ z e. I ) -> ( ( F ` y ) = ( F ` z ) -> y = z ) )
47	46	rgen2 2617	. . 3 |- A. y e. I A. z e. I ( ( F ` y ) = ( F ` z ) -> y = z )
48		dff13 5914	. . 3 |- ( F : I -1-1-> { x e. ZZ | E. i e. I x = ( i x. 2 ) } <-> ( F : I --> { x e. ZZ | E. i e. I x = ( i x. 2 ) } /\ A. y e. I A. z e. I ( ( F ` y ) = ( F ` z ) -> y = z ) ) )
49	17, 47, 48	mpbir2an 950	. 2 |- F : I -1-1-> { x e. ZZ | E. i e. I x = ( i x. 2 ) }
50		oveq1 6030	. . . . . . 7 |- ( j = i -> ( j x. 2 ) = ( i x. 2 ) )
51	50	eqeq2d 2242	. . . . . 6 |- ( j = i -> ( x = ( j x. 2 ) <-> x = ( i x. 2 ) ) )
52	51	cbvrexvw 2771	. . . . 5 |- ( E. j e. I x = ( j x. 2 ) <-> E. i e. I x = ( i x. 2 ) )
53		elfzelz 10265	. . . . . . . . . 10 |- ( i e. ( A ... B ) -> i e. ZZ )
54	7	a1i 9	. . . . . . . . . 10 |- ( i e. ( A ... B ) -> 2 e. ZZ )
55	53, 54	zmulcld 9613	. . . . . . . . 9 |- ( i e. ( A ... B ) -> ( i x. 2 ) e. ZZ )
56	55, 5	eleq2s 2325	. . . . . . . 8 |- ( i e. I -> ( i x. 2 ) e. ZZ )
57		eleq1 2293	. . . . . . . 8 |- ( x = ( i x. 2 ) -> ( x e. ZZ <-> ( i x. 2 ) e. ZZ ) )
58	56, 57	syl5ibrcom 157	. . . . . . 7 |- ( i e. I -> ( x = ( i x. 2 ) -> x e. ZZ ) )
59	58	rexlimiv 2643	. . . . . 6 |- ( E. i e. I x = ( i x. 2 ) -> x e. ZZ )
60	59	pm4.71ri 392	. . . . 5 |- ( E. i e. I x = ( i x. 2 ) <-> ( x e. ZZ /\ E. i e. I x = ( i x. 2 ) ) )
61	52, 60	bitri 184	. . . 4 |- ( E. j e. I x = ( j x. 2 ) <-> ( x e. ZZ /\ E. i e. I x = ( i x. 2 ) ) )
62	61	abbii 2346	. . 3 |- { x | E. j e. I x = ( j x. 2 ) } = { x | ( x e. ZZ /\ E. i e. I x = ( i x. 2 ) ) }
63	1	rnmpt 4982	. . 3 |- ran F = { x | E. j e. I x = ( j x. 2 ) }
64		df-rab 2518	. . 3 |- { x e. ZZ | E. i e. I x = ( i x. 2 ) } = { x | ( x e. ZZ /\ E. i e. I x = ( i x. 2 ) ) }
65	62, 63, 64	3eqtr4i 2261	. 2 |- ran F = { x e. ZZ | E. i e. I x = ( i x. 2 ) }
66		dff1o5 5595	. 2 |- ( F : I -1-1-onto-> { x e. ZZ | E. i e. I x = ( i x. 2 ) } <-> ( F : I -1-1-> { x e. ZZ | E. i e. I x = ( i x. 2 ) } /\ ran F = { x e. ZZ | E. i e. I x = ( i x. 2 ) } ) )
67	49, 65, 66	mpbir2an 950	1 |- F : I -1-1-onto-> { x e. ZZ | E. i e. I x = ( i x. 2 ) }

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1397   e. wcel 2201   {cab 2216   A.wral 2509   E.wrex 2510   {crab 2513   class class class wbr 4089   |-> cmpt 4151   ran crn 4728   -->wf 5324   -1-1->wf1 5325   -1-1-onto->wf1o 5327   ` cfv 5328  (class class class)co 6023   CCcc 8035   0cc0 8037   x. cmul 8042   # cap 8766   2c2 9199   ZZcz 9484   ...cfz 10248

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2203  ax-14 2204  ax-ext 2212  ax-sep 4208  ax-pow 4266  ax-pr 4301  ax-un 4532  ax-setind 4637  ax-cnex 8128  ax-resscn 8129  ax-1cn 8130  ax-1re 8131  ax-icn 8132  ax-addcl 8133  ax-addrcl 8134  ax-mulcl 8135  ax-mulrcl 8136  ax-addcom 8137  ax-mulcom 8138  ax-addass 8139  ax-mulass 8140  ax-distr 8141  ax-i2m1 8142  ax-0lt1 8143  ax-1rid 8144  ax-0id 8145  ax-rnegex 8146  ax-precex 8147  ax-cnre 8148  ax-pre-ltirr 8149  ax-pre-ltwlin 8150  ax-pre-lttrn 8151  ax-pre-apti 8152  ax-pre-ltadd 8153  ax-pre-mulgt0 8154  ax-pre-mulext 8155

This theorem depends on definitions:  df-bi 117  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1810  df-eu 2081  df-mo 2082  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-ne 2402  df-nel 2497  df-ral 2514  df-rex 2515  df-reu 2516  df-rab 2518  df-v 2803  df-sbc 3031  df-csb 3127  df-dif 3201  df-un 3203  df-in 3205  df-ss 3212  df-pw 3655  df-sn 3676  df-pr 3677  df-op 3679  df-uni 3895  df-int 3930  df-br 4090  df-opab 4152  df-mpt 4153  df-id 4392  df-po 4395  df-iso 4396  df-xp 4733  df-rel 4734  df-cnv 4735  df-co 4736  df-dm 4737  df-rn 4738  df-res 4739  df-ima 4740  df-iota 5288  df-fun 5330  df-fn 5331  df-f 5332  df-f1 5333  df-fo 5334  df-f1o 5335  df-fv 5336  df-riota 5976  df-ov 6026  df-oprab 6027  df-mpo 6028  df-pnf 8221  df-mnf 8222  df-xr 8223  df-ltxr 8224  df-le 8225  df-sub 8357  df-neg 8358  df-reap 8760  df-ap 8767  df-inn 9149  df-2 9207  df-n0 9408  df-z 9485  df-uz 9761  df-fz 10249

This theorem is referenced by:  2lgslem1  15849