Theorem 2lgsoddprmlem3 16001

Description: Lemma 3 for 2lgsoddprm . (Contributed by AV, 20-Jul-2021.)

Assertion

Ref	Expression
2lgsoddprmlem3	|- ( ( N e. ZZ /\ -. 2 || N /\ R = ( N mod 8 ) ) -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) <-> R e. { 1 , 7 } ) )

Proof of Theorem 2lgsoddprmlem3

Step	Hyp	Ref	Expression
1		lgsdir2lem3 15920	. . 3 |- ( ( N e. ZZ /\ -. 2 || N ) -> ( N mod 8 ) e. ( { 1 , 7 } u. { 3 , 5 } ) )
2		eleq1 2297	. . . . 5 |- ( ( N mod 8 ) = R -> ( ( N mod 8 ) e. ( { 1 , 7 } u. { 3 , 5 } ) <-> R e. ( { 1 , 7 } u. { 3 , 5 } ) ) )
3	2	eqcoms 2237	. . . 4 |- ( R = ( N mod 8 ) -> ( ( N mod 8 ) e. ( { 1 , 7 } u. { 3 , 5 } ) <-> R e. ( { 1 , 7 } u. { 3 , 5 } ) ) )
4		elun 3362	. . . . . 6 |- ( R e. ( { 1 , 7 } u. { 3 , 5 } ) <-> ( R e. { 1 , 7 } \/ R e. { 3 , 5 } ) )
5		elpri 3714	. . . . . . . 8 |- ( R e. { 3 , 5 } -> ( R = 3 \/ R = 5 ) )
6		oveq1 6059	. . . . . . . . . . . . . 14 |- ( R = 3 -> ( R ^ 2 ) = ( 3 ^ 2 ) )
7	6	oveq1d 6067	. . . . . . . . . . . . 13 |- ( R = 3 -> ( ( R ^ 2 ) - 1 ) = ( ( 3 ^ 2 ) - 1 ) )
8	7	oveq1d 6067	. . . . . . . . . . . 12 |- ( R = 3 -> ( ( ( R ^ 2 ) - 1 ) / 8 ) = ( ( ( 3 ^ 2 ) - 1 ) / 8 ) )
9		2lgsoddprmlem3b 15998	. . . . . . . . . . . 12 |- ( ( ( 3 ^ 2 ) - 1 ) / 8 ) = 1
10	8, 9	eqtrdi 2283	. . . . . . . . . . 11 |- ( R = 3 -> ( ( ( R ^ 2 ) - 1 ) / 8 ) = 1 )
11	10	breq2d 4123	. . . . . . . . . 10 |- ( R = 3 -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) <-> 2 || 1 ) )
12		n2dvds1 12602	. . . . . . . . . . 11 |- -. 2 || 1
13	12	pm2.21i 651	. . . . . . . . . 10 |- ( 2 || 1 -> R e. { 1 , 7 } )
14	11, 13	biimtrdi 163	. . . . . . . . 9 |- ( R = 3 -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) -> R e. { 1 , 7 } ) )
15		oveq1 6059	. . . . . . . . . . . . . 14 |- ( R = 5 -> ( R ^ 2 ) = ( 5 ^ 2 ) )
16	15	oveq1d 6067	. . . . . . . . . . . . 13 |- ( R = 5 -> ( ( R ^ 2 ) - 1 ) = ( ( 5 ^ 2 ) - 1 ) )
17	16	oveq1d 6067	. . . . . . . . . . . 12 |- ( R = 5 -> ( ( ( R ^ 2 ) - 1 ) / 8 ) = ( ( ( 5 ^ 2 ) - 1 ) / 8 ) )
18	17	breq2d 4123	. . . . . . . . . . 11 |- ( R = 5 -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) <-> 2 || ( ( ( 5 ^ 2 ) - 1 ) / 8 ) ) )
19		2lgsoddprmlem3c 15999	. . . . . . . . . . . 12 |- ( ( ( 5 ^ 2 ) - 1 ) / 8 ) = 3
20	19	breq2i 4119	. . . . . . . . . . 11 |- ( 2 || ( ( ( 5 ^ 2 ) - 1 ) / 8 ) <-> 2 || 3 )
21	18, 20	bitrdi 196	. . . . . . . . . 10 |- ( R = 5 -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) <-> 2 || 3 ) )
22		n2dvds3 12605	. . . . . . . . . . 11 |- -. 2 || 3
23	22	pm2.21i 651	. . . . . . . . . 10 |- ( 2 || 3 -> R e. { 1 , 7 } )
24	21, 23	biimtrdi 163	. . . . . . . . 9 |- ( R = 5 -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) -> R e. { 1 , 7 } ) )
25	14, 24	jaoi 724	. . . . . . . 8 |- ( ( R = 3 \/ R = 5 ) -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) -> R e. { 1 , 7 } ) )
26	5, 25	syl 14	. . . . . . 7 |- ( R e. { 3 , 5 } -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) -> R e. { 1 , 7 } ) )
27	26	jao1i 804	. . . . . 6 |- ( ( R e. { 1 , 7 } \/ R e. { 3 , 5 } ) -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) -> R e. { 1 , 7 } ) )
28	4, 27	sylbi 121	. . . . 5 |- ( R e. ( { 1 , 7 } u. { 3 , 5 } ) -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) -> R e. { 1 , 7 } ) )
29		elpri 3714	. . . . . 6 |- ( R e. { 1 , 7 } -> ( R = 1 \/ R = 7 ) )
30		z0even 12601	. . . . . . . 8 |- 2 || 0
31		oveq1 6059	. . . . . . . . . . 11 |- ( R = 1 -> ( R ^ 2 ) = ( 1 ^ 2 ) )
32	31	oveq1d 6067	. . . . . . . . . 10 |- ( R = 1 -> ( ( R ^ 2 ) - 1 ) = ( ( 1 ^ 2 ) - 1 ) )
33	32	oveq1d 6067	. . . . . . . . 9 |- ( R = 1 -> ( ( ( R ^ 2 ) - 1 ) / 8 ) = ( ( ( 1 ^ 2 ) - 1 ) / 8 ) )
34		2lgsoddprmlem3a 15997	. . . . . . . . 9 |- ( ( ( 1 ^ 2 ) - 1 ) / 8 ) = 0
35	33, 34	eqtrdi 2283	. . . . . . . 8 |- ( R = 1 -> ( ( ( R ^ 2 ) - 1 ) / 8 ) = 0 )
36	30, 35	breqtrrid 4149	. . . . . . 7 |- ( R = 1 -> 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) )
37		2z 9607	. . . . . . . . 9 |- 2 e. ZZ
38		3z 9608	. . . . . . . . 9 |- 3 e. ZZ
39		dvdsmul1 12503	. . . . . . . . 9 |- ( ( 2 e. ZZ /\ 3 e. ZZ ) -> 2 || ( 2 x. 3 ) )
40	37, 38, 39	mp2an 426	. . . . . . . 8 |- 2 || ( 2 x. 3 )
41		oveq1 6059	. . . . . . . . . . 11 |- ( R = 7 -> ( R ^ 2 ) = ( 7 ^ 2 ) )
42	41	oveq1d 6067	. . . . . . . . . 10 |- ( R = 7 -> ( ( R ^ 2 ) - 1 ) = ( ( 7 ^ 2 ) - 1 ) )
43	42	oveq1d 6067	. . . . . . . . 9 |- ( R = 7 -> ( ( ( R ^ 2 ) - 1 ) / 8 ) = ( ( ( 7 ^ 2 ) - 1 ) / 8 ) )
44		2lgsoddprmlem3d 16000	. . . . . . . . 9 |- ( ( ( 7 ^ 2 ) - 1 ) / 8 ) = ( 2 x. 3 )
45	43, 44	eqtrdi 2283	. . . . . . . 8 |- ( R = 7 -> ( ( ( R ^ 2 ) - 1 ) / 8 ) = ( 2 x. 3 ) )
46	40, 45	breqtrrid 4149	. . . . . . 7 |- ( R = 7 -> 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) )
47	36, 46	jaoi 724	. . . . . 6 |- ( ( R = 1 \/ R = 7 ) -> 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) )
48	29, 47	syl 14	. . . . 5 |- ( R e. { 1 , 7 } -> 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) )
49	28, 48	impbid1 142	. . . 4 |- ( R e. ( { 1 , 7 } u. { 3 , 5 } ) -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) <-> R e. { 1 , 7 } ) )
50	3, 49	biimtrdi 163	. . 3 |- ( R = ( N mod 8 ) -> ( ( N mod 8 ) e. ( { 1 , 7 } u. { 3 , 5 } ) -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) <-> R e. { 1 , 7 } ) ) )
51	1, 50	syl5com 29	. 2 |- ( ( N e. ZZ /\ -. 2 || N ) -> ( R = ( N mod 8 ) -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) <-> R e. { 1 , 7 } ) ) )
52	51	3impia 1227	1 |- ( ( N e. ZZ /\ -. 2 || N /\ R = ( N mod 8 ) ) -> ( 2 || ( ( ( R ^ 2 ) - 1 ) / 8 ) <-> R e. { 1 , 7 } ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 716   /\ w3a 1005   = wceq 1398   e. wcel 2205   u. cun 3211   {cpr 3692   class class class wbr 4111  (class class class)co 6052   0cc0 8129   1c1 8130   x. cmul 8134   - cmin 8446   / cdiv 8948   2c2 9290   3c3 9291   5c5 9293   7c7 9295   8c8 9296   ZZcz 9579   mod cmo 10688   ^cexp 10904   || cdvds 12477

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-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4227  ax-sep 4230  ax-nul 4238  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-setind 4661  ax-iinf 4712  ax-cnex 8220  ax-resscn 8221  ax-1cn 8222  ax-1re 8223  ax-icn 8224  ax-addcl 8225  ax-addrcl 8226  ax-mulcl 8227  ax-mulrcl 8228  ax-addcom 8229  ax-mulcom 8230  ax-addass 8231  ax-mulass 8232  ax-distr 8233  ax-i2m1 8234  ax-0lt1 8235  ax-1rid 8236  ax-0id 8237  ax-rnegex 8238  ax-precex 8239  ax-cnre 8240  ax-pre-ltirr 8241  ax-pre-ltwlin 8242  ax-pre-lttrn 8243  ax-pre-apti 8244  ax-pre-ltadd 8245  ax-pre-mulgt0 8246  ax-pre-mulext 8247  ax-arch 8248

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-xor 1421  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-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3045  df-csb 3141  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-if 3623  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-int 3952  df-iun 3995  df-br 4112  df-opab 4174  df-mpt 4175  df-tr 4211  df-id 4416  df-po 4419  df-iso 4420  df-iord 4489  df-on 4491  df-ilim 4492  df-suc 4494  df-iom 4715  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361  df-fv 5362  df-riota 6005  df-ov 6055  df-oprab 6056  df-mpo 6057  df-1st 6336  df-2nd 6337  df-recs 6538  df-frec 6624  df-pnf 8312  df-mnf 8313  df-xr 8314  df-ltxr 8315  df-le 8316  df-sub 8448  df-neg 8449  df-reap 8851  df-ap 8858  df-div 8949  df-inn 9240  df-2 9298  df-3 9299  df-4 9300  df-5 9301  df-6 9302  df-7 9303  df-8 9304  df-9 9305  df-n0 9499  df-z 9580  df-uz 9857  df-q 9955  df-rp 9990  df-fz 10346  df-fl 10634  df-mod 10689  df-seqfrec 10814  df-exp 10905  df-dvds 12478

This theorem is referenced by:  2lgsoddprmlem4  16002