Theorem 2lgslem1c 15848

Description: Lemma 3 for 2lgslem1 15849. (Contributed by AV, 19-Jun-2021.)

Assertion

Ref	Expression
2lgslem1c	|- ( ( P e. Prime /\ -. 2 || P ) -> ( |_ ` ( P / 4 ) ) <_ ( ( P - 1 ) / 2 ) )

Proof of Theorem 2lgslem1c

Dummy variable n is distinct from all other variables.

Step	Hyp	Ref	Expression
1		prmnn 12705	. . . 4 |- ( P e. Prime -> P e. NN )
2		nnnn0 9414	. . . 4 |- ( P e. NN -> P e. NN0 )
3		oddnn02np1 12464	. . . 4 |- ( P e. NN0 -> ( -. 2 || P <-> E. n e. NN0 ( ( 2 x. n ) + 1 ) = P ) )
4	1, 2, 3	3syl 17	. . 3 |- ( P e. Prime -> ( -. 2 || P <-> E. n e. NN0 ( ( 2 x. n ) + 1 ) = P ) )
5		iftrue 3611	. . . . . . . . . 10 |- ( 2 || n -> if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) = ( n / 2 ) )
6	5	adantr 276	. . . . . . . . 9 |- ( ( 2 || n /\ n e. NN0 ) -> if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) = ( n / 2 ) )
7		2nn 9310	. . . . . . . . . . 11 |- 2 e. NN
8		nn0ledivnn 10007	. . . . . . . . . . 11 |- ( ( n e. NN0 /\ 2 e. NN ) -> ( n / 2 ) <_ n )
9	7, 8	mpan2 425	. . . . . . . . . 10 |- ( n e. NN0 -> ( n / 2 ) <_ n )
10	9	adantl 277	. . . . . . . . 9 |- ( ( 2 || n /\ n e. NN0 ) -> ( n / 2 ) <_ n )
11	6, 10	eqbrtrd 4111	. . . . . . . 8 |- ( ( 2 || n /\ n e. NN0 ) -> if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) <_ n )
12	11	expcom 116	. . . . . . 7 |- ( n e. NN0 -> ( 2 || n -> if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) <_ n ) )
13		iffalse 3614	. . . . . . . . . 10 |- ( -. 2 || n -> if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) = ( ( n - 1 ) / 2 ) )
14	13	adantr 276	. . . . . . . . 9 |- ( ( -. 2 || n /\ n e. NN0 ) -> if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) = ( ( n - 1 ) / 2 ) )
15		nn0re 9416	. . . . . . . . . . . 12 |- ( n e. NN0 -> n e. RR )
16		peano2rem 8451	. . . . . . . . . . . . 13 |- ( n e. RR -> ( n - 1 ) e. RR )
17	16	rehalfcld 9396	. . . . . . . . . . . 12 |- ( n e. RR -> ( ( n - 1 ) / 2 ) e. RR )
18	15, 17	syl 14	. . . . . . . . . . 11 |- ( n e. NN0 -> ( ( n - 1 ) / 2 ) e. RR )
19	15	rehalfcld 9396	. . . . . . . . . . 11 |- ( n e. NN0 -> ( n / 2 ) e. RR )
20	15	lem1d 9118	. . . . . . . . . . . 12 |- ( n e. NN0 -> ( n - 1 ) <_ n )
21	15, 16	syl 14	. . . . . . . . . . . . 13 |- ( n e. NN0 -> ( n - 1 ) e. RR )
22		2re 9218	. . . . . . . . . . . . . . 15 |- 2 e. RR
23		2pos 9239	. . . . . . . . . . . . . . 15 |- 0 < 2
24	22, 23	pm3.2i 272	. . . . . . . . . . . . . 14 |- ( 2 e. RR /\ 0 < 2 )
25	24	a1i 9	. . . . . . . . . . . . 13 |- ( n e. NN0 -> ( 2 e. RR /\ 0 < 2 ) )
26		lediv1 9054	. . . . . . . . . . . . 13 |- ( ( ( n - 1 ) e. RR /\ n e. RR /\ ( 2 e. RR /\ 0 < 2 ) ) -> ( ( n - 1 ) <_ n <-> ( ( n - 1 ) / 2 ) <_ ( n / 2 ) ) )
27	21, 15, 25, 26	syl3anc 1273	. . . . . . . . . . . 12 |- ( n e. NN0 -> ( ( n - 1 ) <_ n <-> ( ( n - 1 ) / 2 ) <_ ( n / 2 ) ) )
28	20, 27	mpbid 147	. . . . . . . . . . 11 |- ( n e. NN0 -> ( ( n - 1 ) / 2 ) <_ ( n / 2 ) )
29	18, 19, 15, 28, 9	letrd 8308	. . . . . . . . . 10 |- ( n e. NN0 -> ( ( n - 1 ) / 2 ) <_ n )
30	29	adantl 277	. . . . . . . . 9 |- ( ( -. 2 || n /\ n e. NN0 ) -> ( ( n - 1 ) / 2 ) <_ n )
31	14, 30	eqbrtrd 4111	. . . . . . . 8 |- ( ( -. 2 || n /\ n e. NN0 ) -> if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) <_ n )
32	31	expcom 116	. . . . . . 7 |- ( n e. NN0 -> ( -. 2 || n -> if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) <_ n ) )
33		nn0z 9504	. . . . . . . 8 |- ( n e. NN0 -> n e. ZZ )
34		zeo3 12452	. . . . . . . 8 |- ( n e. ZZ -> ( 2 || n \/ -. 2 || n ) )
35	33, 34	syl 14	. . . . . . 7 |- ( n e. NN0 -> ( 2 || n \/ -. 2 || n ) )
36	12, 32, 35	mpjaod 725	. . . . . 6 |- ( n e. NN0 -> if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) <_ n )
37	36	ad2antlr 489	. . . . 5 |- ( ( ( P e. Prime /\ n e. NN0 ) /\ ( ( 2 x. n ) + 1 ) = P ) -> if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) <_ n )
38	33	adantl 277	. . . . . 6 |- ( ( P e. Prime /\ n e. NN0 ) -> n e. ZZ )
39		eqcom 2232	. . . . . . 7 |- ( ( ( 2 x. n ) + 1 ) = P <-> P = ( ( 2 x. n ) + 1 ) )
40	39	biimpi 120	. . . . . 6 |- ( ( ( 2 x. n ) + 1 ) = P -> P = ( ( 2 x. n ) + 1 ) )
41		flodddiv4 12520	. . . . . 6 |- ( ( n e. ZZ /\ P = ( ( 2 x. n ) + 1 ) ) -> ( |_ ` ( P / 4 ) ) = if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) )
42	38, 40, 41	syl2an 289	. . . . 5 |- ( ( ( P e. Prime /\ n e. NN0 ) /\ ( ( 2 x. n ) + 1 ) = P ) -> ( |_ ` ( P / 4 ) ) = if ( 2 || n , ( n / 2 ) , ( ( n - 1 ) / 2 ) ) )
43		oveq1 6030	. . . . . . . . . 10 |- ( P = ( ( 2 x. n ) + 1 ) -> ( P - 1 ) = ( ( ( 2 x. n ) + 1 ) - 1 ) )
44	43	eqcoms 2233	. . . . . . . . 9 |- ( ( ( 2 x. n ) + 1 ) = P -> ( P - 1 ) = ( ( ( 2 x. n ) + 1 ) - 1 ) )
45	44	adantl 277	. . . . . . . 8 |- ( ( ( P e. Prime /\ n e. NN0 ) /\ ( ( 2 x. n ) + 1 ) = P ) -> ( P - 1 ) = ( ( ( 2 x. n ) + 1 ) - 1 ) )
46		2nn0 9424	. . . . . . . . . . . . 13 |- 2 e. NN0
47	46	a1i 9	. . . . . . . . . . . 12 |- ( n e. NN0 -> 2 e. NN0 )
48		id 19	. . . . . . . . . . . 12 |- ( n e. NN0 -> n e. NN0 )
49	47, 48	nn0mulcld 9465	. . . . . . . . . . 11 |- ( n e. NN0 -> ( 2 x. n ) e. NN0 )
50	49	nn0cnd 9462	. . . . . . . . . 10 |- ( n e. NN0 -> ( 2 x. n ) e. CC )
51		pncan1 8561	. . . . . . . . . 10 |- ( ( 2 x. n ) e. CC -> ( ( ( 2 x. n ) + 1 ) - 1 ) = ( 2 x. n ) )
52	50, 51	syl 14	. . . . . . . . 9 |- ( n e. NN0 -> ( ( ( 2 x. n ) + 1 ) - 1 ) = ( 2 x. n ) )
53	52	ad2antlr 489	. . . . . . . 8 |- ( ( ( P e. Prime /\ n e. NN0 ) /\ ( ( 2 x. n ) + 1 ) = P ) -> ( ( ( 2 x. n ) + 1 ) - 1 ) = ( 2 x. n ) )
54	45, 53	eqtrd 2263	. . . . . . 7 |- ( ( ( P e. Prime /\ n e. NN0 ) /\ ( ( 2 x. n ) + 1 ) = P ) -> ( P - 1 ) = ( 2 x. n ) )
55	54	oveq1d 6038	. . . . . 6 |- ( ( ( P e. Prime /\ n e. NN0 ) /\ ( ( 2 x. n ) + 1 ) = P ) -> ( ( P - 1 ) / 2 ) = ( ( 2 x. n ) / 2 ) )
56		nn0cn 9417	. . . . . . . 8 |- ( n e. NN0 -> n e. CC )
57		2cnd 9221	. . . . . . . 8 |- ( n e. NN0 -> 2 e. CC )
58		2ap0 9241	. . . . . . . . 9 |- 2 # 0
59	58	a1i 9	. . . . . . . 8 |- ( n e. NN0 -> 2 # 0 )
60	56, 57, 59	divcanap3d 8980	. . . . . . 7 |- ( n e. NN0 -> ( ( 2 x. n ) / 2 ) = n )
61	60	ad2antlr 489	. . . . . 6 |- ( ( ( P e. Prime /\ n e. NN0 ) /\ ( ( 2 x. n ) + 1 ) = P ) -> ( ( 2 x. n ) / 2 ) = n )
62	55, 61	eqtrd 2263	. . . . 5 |- ( ( ( P e. Prime /\ n e. NN0 ) /\ ( ( 2 x. n ) + 1 ) = P ) -> ( ( P - 1 ) / 2 ) = n )
63	37, 42, 62	3brtr4d 4121	. . . 4 |- ( ( ( P e. Prime /\ n e. NN0 ) /\ ( ( 2 x. n ) + 1 ) = P ) -> ( |_ ` ( P / 4 ) ) <_ ( ( P - 1 ) / 2 ) )
64	63	rexlimdva2 2652	. . 3 |- ( P e. Prime -> ( E. n e. NN0 ( ( 2 x. n ) + 1 ) = P -> ( |_ ` ( P / 4 ) ) <_ ( ( P - 1 ) / 2 ) ) )
65	4, 64	sylbid 150	. 2 |- ( P e. Prime -> ( -. 2 || P -> ( |_ ` ( P / 4 ) ) <_ ( ( P - 1 ) / 2 ) ) )
66	65	imp 124	1 |- ( ( P e. Prime /\ -. 2 || P ) -> ( |_ ` ( P / 4 ) ) <_ ( ( P - 1 ) / 2 ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 715   = wceq 1397   e. wcel 2201   E.wrex 2510   ifcif 3604   class class class wbr 4089   ` cfv 5328  (class class class)co 6023   CCcc 8035   RRcr 8036   0cc0 8037   1c1 8038   + caddc 8040   x. cmul 8042   < clt 8219   <_ cle 8220   - cmin 8355   # cap 8766   / cdiv 8857   NNcn 9148   2c2 9199   4c4 9201   NN0cn0 9407   ZZcz 9484   |_cfl 10534   || cdvds 12371   Primecprime 12702

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  ax-arch 8156

This theorem depends on definitions:  df-bi 117  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-xor 1420  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-rmo 2517  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-if 3605  df-pw 3655  df-sn 3676  df-pr 3677  df-op 3679  df-uni 3895  df-int 3930  df-iun 3973  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-fv 5336  df-riota 5976  df-ov 6026  df-oprab 6027  df-mpo 6028  df-1st 6308  df-2nd 6309  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-div 8858  df-inn 9149  df-2 9207  df-3 9208  df-4 9209  df-n0 9408  df-z 9485  df-q 9859  df-rp 9894  df-fl 10536  df-dvds 12372  df-prm 12703

This theorem is referenced by:  2lgslem1  15849