Theorem resqrexlemsqa 11773

Description: Lemma for resqrex 11775. The square of a limit is A. (Contributed by Jim Kingdon, 7-Aug-2021.)

Hypotheses

Ref	Expression
resqrexlemex.seq	|- F = seq 1 ( ( y e. RR+ , z e. RR+ |-> ( ( y + ( A / y ) ) / 2 ) ) , ( NN X. { ( 1 + A ) } ) )
resqrexlemex.a	|- ( ph -> A e. RR )
resqrexlemex.agt0	|- ( ph -> 0 <_ A )
resqrexlemgt0.rr	|- ( ph -> L e. RR )
resqrexlemgt0.lim	|- ( ph -> A. e e. RR+ E. j e. NN A. i e. ( ZZ>= ` j ) ( ( F ` i ) < ( L + e ) /\ L < ( ( F ` i ) + e ) ) )

Assertion

Ref	Expression
resqrexlemsqa	|- ( ph -> ( L ^ 2 ) = A )

Distinct variable groups:   A, e, j   y, A, z   e, F, j   y, F, z   i, F   e, L, j, i   y, L, z   e, i, j   ph, y, z

Allowed substitution hints:   ph( e, i, j)   A( i)

Proof of Theorem resqrexlemsqa

Dummy variables a b c d x are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		resqrexlemex.seq	. . . . . . 7 |- F = seq 1 ( ( y e. RR+ , z e. RR+ |-> ( ( y + ( A / y ) ) / 2 ) ) , ( NN X. { ( 1 + A ) } ) )
2		resqrexlemex.a	. . . . . . 7 |- ( ph -> A e. RR )
3		resqrexlemex.agt0	. . . . . . 7 |- ( ph -> 0 <_ A )
4	1, 2, 3	resqrexlemf 11756	. . . . . 6 |- ( ph -> F : NN --> RR+ )
5	4	ffvelcdmda 5837	. . . . 5 |- ( ( ph /\ x e. NN ) -> ( F ` x ) e. RR+ )
6		2z 9655	. . . . . 6 |- 2 e. ZZ
7	6	a1i 9	. . . . 5 |- ( ( ph /\ x e. NN ) -> 2 e. ZZ )
8	5, 7	rpexpcld 11118	. . . 4 |- ( ( ph /\ x e. NN ) -> ( ( F ` x ) ^ 2 ) e. RR+ )
9		eqid 2238	. . . 4 |- ( x e. NN |-> ( ( F ` x ) ^ 2 ) ) = ( x e. NN |-> ( ( F ` x ) ^ 2 ) )
10	8, 9	fmptd 5856	. . 3 |- ( ph -> ( x e. NN |-> ( ( F ` x ) ^ 2 ) ) : NN --> RR+ )
11		rpssre 10048	. . . 4 |- RR+ C_ RR
12	11	a1i 9	. . 3 |- ( ph -> RR+ C_ RR )
13	10, 12	fssd 5545	. 2 |- ( ph -> ( x e. NN |-> ( ( F ` x ) ^ 2 ) ) : NN --> RR )
14		resqrexlemgt0.rr	. . 3 |- ( ph -> L e. RR )
15	14	resqcld 11120	. 2 |- ( ph -> ( L ^ 2 ) e. RR )
16		resqrexlemgt0.lim	. . . 4 |- ( ph -> A. e e. RR+ E. j e. NN A. i e. ( ZZ>= ` j ) ( ( F ` i ) < ( L + e ) /\ L < ( ( F ` i ) + e ) ) )
17		oveq2 6087	. . . . . . . . 9 |- ( e = a -> ( L + e ) = ( L + a ) )
18	17	breq2d 4140	. . . . . . . 8 |- ( e = a -> ( ( F ` i ) < ( L + e ) <-> ( F ` i ) < ( L + a ) ) )
19		oveq2 6087	. . . . . . . . 9 |- ( e = a -> ( ( F ` i ) + e ) = ( ( F ` i ) + a ) )
20	19	breq2d 4140	. . . . . . . 8 |- ( e = a -> ( L < ( ( F ` i ) + e ) <-> L < ( ( F ` i ) + a ) ) )
21	18, 20	anbi12d 477	. . . . . . 7 |- ( e = a -> ( ( ( F ` i ) < ( L + e ) /\ L < ( ( F ` i ) + e ) ) <-> ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) ) )
22	21	rexralbidv 2576	. . . . . 6 |- ( e = a -> ( E. j e. NN A. i e. ( ZZ>= ` j ) ( ( F ` i ) < ( L + e ) /\ L < ( ( F ` i ) + e ) ) <-> E. j e. NN A. i e. ( ZZ>= ` j ) ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) ) )
23	22	cbvralv 2786	. . . . 5 |- ( A. e e. RR+ E. j e. NN A. i e. ( ZZ>= ` j ) ( ( F ` i ) < ( L + e ) /\ L < ( ( F ` i ) + e ) ) <-> A. a e. RR+ E. j e. NN A. i e. ( ZZ>= ` j ) ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) )
24		fveq2 5693	. . . . . . . 8 |- ( j = b -> ( ZZ>= ` j ) = ( ZZ>= ` b ) )
25	24	raleqdv 2755	. . . . . . 7 |- ( j = b -> ( A. i e. ( ZZ>= ` j ) ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) <-> A. i e. ( ZZ>= ` b ) ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) ) )
26	25	cbvrexv 2787	. . . . . 6 |- ( E. j e. NN A. i e. ( ZZ>= ` j ) ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) <-> E. b e. NN A. i e. ( ZZ>= ` b ) ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) )
27	26	ralbii 2556	. . . . 5 |- ( A. a e. RR+ E. j e. NN A. i e. ( ZZ>= ` j ) ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) <-> A. a e. RR+ E. b e. NN A. i e. ( ZZ>= ` b ) ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) )
28		fveq2 5693	. . . . . . . . . 10 |- ( i = c -> ( F ` i ) = ( F ` c ) )
29	28	breq1d 4138	. . . . . . . . 9 |- ( i = c -> ( ( F ` i ) < ( L + a ) <-> ( F ` c ) < ( L + a ) ) )
30	28	oveq1d 6094	. . . . . . . . . 10 |- ( i = c -> ( ( F ` i ) + a ) = ( ( F ` c ) + a ) )
31	30	breq2d 4140	. . . . . . . . 9 |- ( i = c -> ( L < ( ( F ` i ) + a ) <-> L < ( ( F ` c ) + a ) ) )
32	29, 31	anbi12d 477	. . . . . . . 8 |- ( i = c -> ( ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) <-> ( ( F ` c ) < ( L + a ) /\ L < ( ( F ` c ) + a ) ) ) )
33	32	cbvralv 2786	. . . . . . 7 |- ( A. i e. ( ZZ>= ` b ) ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) <-> A. c e. ( ZZ>= ` b ) ( ( F ` c ) < ( L + a ) /\ L < ( ( F ` c ) + a ) ) )
34	33	rexbii 2557	. . . . . 6 |- ( E. b e. NN A. i e. ( ZZ>= ` b ) ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) <-> E. b e. NN A. c e. ( ZZ>= ` b ) ( ( F ` c ) < ( L + a ) /\ L < ( ( F ` c ) + a ) ) )
35	34	ralbii 2556	. . . . 5 |- ( A. a e. RR+ E. b e. NN A. i e. ( ZZ>= ` b ) ( ( F ` i ) < ( L + a ) /\ L < ( ( F ` i ) + a ) ) <-> A. a e. RR+ E. b e. NN A. c e. ( ZZ>= ` b ) ( ( F ` c ) < ( L + a ) /\ L < ( ( F ` c ) + a ) ) )
36	23, 27, 35	3bitri 206	. . . 4 |- ( A. e e. RR+ E. j e. NN A. i e. ( ZZ>= ` j ) ( ( F ` i ) < ( L + e ) /\ L < ( ( F ` i ) + e ) ) <-> A. a e. RR+ E. b e. NN A. c e. ( ZZ>= ` b ) ( ( F ` c ) < ( L + a ) /\ L < ( ( F ` c ) + a ) ) )
37	16, 36	sylib 122	. . 3 |- ( ph -> A. a e. RR+ E. b e. NN A. c e. ( ZZ>= ` b ) ( ( F ` c ) < ( L + a ) /\ L < ( ( F ` c ) + a ) ) )
38	1, 2, 3, 14, 37, 9	resqrexlemglsq 11771	. 2 |- ( ph -> A. a e. RR+ E. b e. NN A. d e. ( ZZ>= ` b ) ( ( ( x e. NN |-> ( ( F ` x ) ^ 2 ) ) ` d ) < ( ( L ^ 2 ) + a ) /\ ( L ^ 2 ) < ( ( ( x e. NN |-> ( ( F ` x ) ^ 2 ) ) ` d ) + a ) ) )
39	1, 2, 3, 14, 37, 9	resqrexlemga 11772	. 2 |- ( ph -> A. a e. RR+ E. b e. NN A. d e. ( ZZ>= ` b ) ( ( ( x e. NN |-> ( ( F ` x ) ^ 2 ) ) ` d ) < ( A + a ) /\ A < ( ( ( x e. NN |-> ( ( F ` x ) ^ 2 ) ) ` d ) + a ) ) )
40	13, 15, 38, 2, 39	recvguniq 11744	1 |- ( ph -> ( L ^ 2 ) = A )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1402   e. wcel 2209   A.wral 2528   E.wrex 2529   C_ wss 3220   {csn 3708   class class class wbr 4128   |-> cmpt 4190   X. cxp 4770   ` cfv 5375  (class class class)co 6079   e. cmpo 6081   RRcr 8172   0cc0 8173   1c1 8174   + caddc 8176   < clt 8354   <_ cle 8355   / cdiv 8996   NNcn 9287   2c2 9338   ZZcz 9627   ZZ>=cuz 9904   RR+crp 10037   seqcseq 10867   ^cexp 10958

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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4244  ax-sep 4247  ax-nul 4257  ax-pow 4309  ax-pr 4344  ax-un 4576  ax-setind 4682  ax-iinf 4733  ax-cnex 8264  ax-resscn 8265  ax-1cn 8266  ax-1re 8267  ax-icn 8268  ax-addcl 8269  ax-addrcl 8270  ax-mulcl 8271  ax-mulrcl 8272  ax-addcom 8273  ax-mulcom 8274  ax-addass 8275  ax-mulass 8276  ax-distr 8277  ax-i2m1 8278  ax-0lt1 8279  ax-1rid 8280  ax-0id 8281  ax-rnegex 8282  ax-precex 8283  ax-cnre 8284  ax-pre-ltirr 8285  ax-pre-ltwlin 8286  ax-pre-lttrn 8287  ax-pre-apti 8288  ax-pre-ltadd 8289  ax-pre-mulgt0 8290  ax-pre-mulext 8291  ax-arch 8292

This theorem depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-int 3969  df-iun 4012  df-br 4129  df-opab 4191  df-mpt 4192  df-tr 4228  df-id 4436  df-po 4439  df-iso 4440  df-iord 4509  df-on 4511  df-ilim 4512  df-suc 4514  df-iom 4736  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-ima 4785  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-f1 5380  df-fo 5381  df-f1o 5382  df-fv 5383  df-riota 6032  df-ov 6082  df-oprab 6083  df-mpo 6084  df-1st 6368  df-2nd 6369  df-recs 6570  df-frec 6656  df-pnf 8356  df-mnf 8357  df-xr 8358  df-ltxr 8359  df-le 8360  df-sub 8493  df-neg 8494  df-reap 8897  df-ap 8904  df-div 8997  df-inn 9288  df-2 9346  df-3 9347  df-4 9348  df-n0 9547  df-z 9628  df-uz 9905  df-rp 10038  df-seqfrec 10868  df-exp 10959

This theorem is referenced by:  resqrexlemex  11774