Theorem bitsp1 12665

Description: The M + 1-th bit of N is the M-th bit of |_ ( N / 2 ). (Contributed by Mario Carneiro, 5-Sep-2016.)

Assertion

Ref	Expression
bitsp1	|- ( ( N e. ZZ /\ M e. NN0 ) -> ( ( M + 1 ) e. (bits ` N ) <-> M e. (bits ` ( |_ ` ( N / 2 ) ) ) ) )

Proof of Theorem bitsp1

Step	Hyp	Ref	Expression
1		2nn 9419	. . . . . . . . . . . 12 |- 2 e. NN
2	1	a1i 9	. . . . . . . . . . 11 |- ( ( N e. ZZ /\ M e. NN0 ) -> 2 e. NN )
3	2	nncnd 9271	. . . . . . . . . 10 |- ( ( N e. ZZ /\ M e. NN0 ) -> 2 e. CC )
4		simpr 110	. . . . . . . . . 10 |- ( ( N e. ZZ /\ M e. NN0 ) -> M e. NN0 )
5	3, 4	expp1d 11064	. . . . . . . . 9 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( 2 ^ ( M + 1 ) ) = ( ( 2 ^ M ) x. 2 ) )
6	2, 4	nnexpcld 11085	. . . . . . . . . . 11 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( 2 ^ M ) e. NN )
7	6	nncnd 9271	. . . . . . . . . 10 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( 2 ^ M ) e. CC )
8	7, 3	mulcomd 8311	. . . . . . . . 9 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( ( 2 ^ M ) x. 2 ) = ( 2 x. ( 2 ^ M ) ) )
9	5, 8	eqtrd 2267	. . . . . . . 8 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( 2 ^ ( M + 1 ) ) = ( 2 x. ( 2 ^ M ) ) )
10	9	oveq2d 6074	. . . . . . 7 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( N / ( 2 ^ ( M + 1 ) ) ) = ( N / ( 2 x. ( 2 ^ M ) ) ) )
11		simpl 109	. . . . . . . . 9 |- ( ( N e. ZZ /\ M e. NN0 ) -> N e. ZZ )
12	11	zcnd 9722	. . . . . . . 8 |- ( ( N e. ZZ /\ M e. NN0 ) -> N e. CC )
13	2	nnap0d 9303	. . . . . . . 8 |- ( ( N e. ZZ /\ M e. NN0 ) -> 2 # 0 )
14	6	nnap0d 9303	. . . . . . . 8 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( 2 ^ M ) # 0 )
15	12, 3, 7, 13, 14	divdivap1d 9116	. . . . . . 7 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( ( N / 2 ) / ( 2 ^ M ) ) = ( N / ( 2 x. ( 2 ^ M ) ) ) )
16	10, 15	eqtr4d 2270	. . . . . 6 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( N / ( 2 ^ ( M + 1 ) ) ) = ( ( N / 2 ) / ( 2 ^ M ) ) )
17	16	fveq2d 5679	. . . . 5 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( |_ ` ( N / ( 2 ^ ( M + 1 ) ) ) ) = ( |_ ` ( ( N / 2 ) / ( 2 ^ M ) ) ) )
18		znq 9977	. . . . . . 7 |- ( ( N e. ZZ /\ 2 e. NN ) -> ( N / 2 ) e. QQ )
19	2, 18	syldan 282	. . . . . 6 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( N / 2 ) e. QQ )
20		flqdiv 10710	. . . . . 6 |- ( ( ( N / 2 ) e. QQ /\ ( 2 ^ M ) e. NN ) -> ( |_ ` ( ( |_ ` ( N / 2 ) ) / ( 2 ^ M ) ) ) = ( |_ ` ( ( N / 2 ) / ( 2 ^ M ) ) ) )
21	19, 6, 20	syl2anc 411	. . . . 5 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( |_ ` ( ( |_ ` ( N / 2 ) ) / ( 2 ^ M ) ) ) = ( |_ ` ( ( N / 2 ) / ( 2 ^ M ) ) ) )
22	17, 21	eqtr4d 2270	. . . 4 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( |_ ` ( N / ( 2 ^ ( M + 1 ) ) ) ) = ( |_ ` ( ( |_ ` ( N / 2 ) ) / ( 2 ^ M ) ) ) )
23	22	breq2d 4126	. . 3 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( 2 || ( |_ ` ( N / ( 2 ^ ( M + 1 ) ) ) ) <-> 2 || ( |_ ` ( ( |_ ` ( N / 2 ) ) / ( 2 ^ M ) ) ) ) )
24	23	notbid 673	. 2 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( -. 2 || ( |_ ` ( N / ( 2 ^ ( M + 1 ) ) ) ) <-> -. 2 || ( |_ ` ( ( |_ ` ( N / 2 ) ) / ( 2 ^ M ) ) ) ) )
25		peano2nn0 9556	. . 3 |- ( M e. NN0 -> ( M + 1 ) e. NN0 )
26		bitsval2 12658	. . 3 |- ( ( N e. ZZ /\ ( M + 1 ) e. NN0 ) -> ( ( M + 1 ) e. (bits ` N ) <-> -. 2 || ( |_ ` ( N / ( 2 ^ ( M + 1 ) ) ) ) ) )
27	25, 26	sylan2 286	. 2 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( ( M + 1 ) e. (bits ` N ) <-> -. 2 || ( |_ ` ( N / ( 2 ^ ( M + 1 ) ) ) ) ) )
28	19	flqcld 10664	. . 3 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( |_ ` ( N / 2 ) ) e. ZZ )
29		bitsval2 12658	. . 3 |- ( ( ( |_ ` ( N / 2 ) ) e. ZZ /\ M e. NN0 ) -> ( M e. (bits ` ( |_ ` ( N / 2 ) ) ) <-> -. 2 || ( |_ ` ( ( |_ ` ( N / 2 ) ) / ( 2 ^ M ) ) ) ) )
30	28, 29	sylancom 420	. 2 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( M e. (bits ` ( |_ ` ( N / 2 ) ) ) <-> -. 2 || ( |_ ` ( ( |_ ` ( N / 2 ) ) / ( 2 ^ M ) ) ) ) )
31	24, 27, 30	3bitr4d 220	1 |- ( ( N e. ZZ /\ M e. NN0 ) -> ( ( M + 1 ) e. (bits ` N ) <-> M e. (bits ` ( |_ ` ( N / 2 ) ) ) ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1398   e. wcel 2205   class class class wbr 4114   ` cfv 5357  (class class class)co 6058   1c1 8144   + caddc 8146   x. cmul 8148   / cdiv 8966   NNcn 9257   2c2 9308   NN0cn0 9516   ZZcz 9597   QQcq 9972   |_cfl 10655   ^cexp 10927   || cdvds 12501  bitscbits 12654

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 4230  ax-sep 4233  ax-nul 4241  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-iinf 4715  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-mulrcl 8242  ax-addcom 8243  ax-mulcom 8244  ax-addass 8245  ax-mulass 8246  ax-distr 8247  ax-i2m1 8248  ax-0lt1 8249  ax-1rid 8250  ax-0id 8251  ax-rnegex 8252  ax-precex 8253  ax-cnre 8254  ax-pre-ltirr 8255  ax-pre-ltwlin 8256  ax-pre-lttrn 8257  ax-pre-apti 8258  ax-pre-ltadd 8259  ax-pre-mulgt0 8260  ax-pre-mulext 8261  ax-arch 8262

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-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-if 3625  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-iun 3998  df-br 4115  df-opab 4177  df-mpt 4178  df-tr 4214  df-id 4419  df-po 4422  df-iso 4423  df-iord 4492  df-on 4494  df-ilim 4495  df-suc 4497  df-iom 4718  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364  df-fv 5365  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-1st 6347  df-2nd 6348  df-recs 6549  df-frec 6635  df-pnf 8326  df-mnf 8327  df-xr 8328  df-ltxr 8329  df-le 8330  df-sub 8463  df-neg 8464  df-reap 8867  df-ap 8874  df-div 8967  df-inn 9258  df-2 9316  df-n0 9517  df-z 9598  df-uz 9875  df-q 9973  df-rp 10008  df-fl 10657  df-seqfrec 10837  df-exp 10928  df-bits 12655

This theorem is referenced by:  bitsp1e  12666  bitsp1o  12667