ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  resqrexlemgt0 Unicode version

Theorem resqrexlemgt0 10984
Description: Lemma for resqrex 10990. A limit is nonnegative. (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
resqrexlemgt0  |-  ( ph  ->  0  <_  L )
Distinct variable groups:    y, A, z   
e, F    e, L, i, j    ph, i, j   
z, j, ph    ph, y
Allowed substitution hints:    ph( e)    A( e,
i, j)    F( y,
z, i, j)    L( y, z)

Proof of Theorem resqrexlemgt0
StepHypRef Expression
1 oveq2 5861 . . . . . . . . 9  |-  ( e  =  -u L  ->  ( L  +  e )  =  ( L  +  -u L ) )
21breq2d 4001 . . . . . . . 8  |-  ( e  =  -u L  ->  (
( F `  i
)  <  ( L  +  e )  <->  ( F `  i )  <  ( L  +  -u L ) ) )
3 oveq2 5861 . . . . . . . . 9  |-  ( e  =  -u L  ->  (
( F `  i
)  +  e )  =  ( ( F `
 i )  + 
-u L ) )
43breq2d 4001 . . . . . . . 8  |-  ( e  =  -u L  ->  ( L  <  ( ( F `
 i )  +  e )  <->  L  <  ( ( F `  i
)  +  -u L
) ) )
52, 4anbi12d 470 . . . . . . 7  |-  ( e  =  -u L  ->  (
( ( F `  i )  <  ( L  +  e )  /\  L  <  ( ( F `  i )  +  e ) )  <-> 
( ( F `  i )  <  ( L  +  -u L )  /\  L  <  (
( F `  i
)  +  -u L
) ) ) )
65rexralbidv 2496 . . . . . 6  |-  ( e  =  -u L  ->  ( 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  +  -u L )  /\  L  <  (
( F `  i
)  +  -u L
) ) ) )
7 resqrexlemgt0.lim . . . . . . 7  |-  ( ph  ->  A. e  e.  RR+  E. j  e.  NN  A. i  e.  ( ZZ>= `  j ) ( ( F `  i )  <  ( L  +  e )  /\  L  <  ( ( F `  i )  +  e ) ) )
87adantr 274 . . . . . 6  |-  ( (
ph  /\  L  <  0 )  ->  A. e  e.  RR+  E. j  e.  NN  A. i  e.  ( ZZ>= `  j )
( ( F `  i )  <  ( L  +  e )  /\  L  <  ( ( F `  i )  +  e ) ) )
9 resqrexlemgt0.rr . . . . . . . . 9  |-  ( ph  ->  L  e.  RR )
109adantr 274 . . . . . . . 8  |-  ( (
ph  /\  L  <  0 )  ->  L  e.  RR )
1110renegcld 8299 . . . . . . 7  |-  ( (
ph  /\  L  <  0 )  ->  -u L  e.  RR )
129lt0neg1d 8434 . . . . . . . 8  |-  ( ph  ->  ( L  <  0  <->  0  <  -u L ) )
1312biimpa 294 . . . . . . 7  |-  ( (
ph  /\  L  <  0 )  ->  0  <  -u L )
1411, 13elrpd 9650 . . . . . 6  |-  ( (
ph  /\  L  <  0 )  ->  -u L  e.  RR+ )
156, 8, 14rspcdva 2839 . . . . 5  |-  ( (
ph  /\  L  <  0 )  ->  E. j  e.  NN  A. i  e.  ( ZZ>= `  j )
( ( F `  i )  <  ( L  +  -u L )  /\  L  <  (
( F `  i
)  +  -u L
) ) )
16 simpl 108 . . . . . . . 8  |-  ( ( ( F `  i
)  <  ( L  +  -u L )  /\  L  <  ( ( F `
 i )  + 
-u L ) )  ->  ( F `  i )  <  ( L  +  -u L ) )
1710recnd 7948 . . . . . . . . . 10  |-  ( (
ph  /\  L  <  0 )  ->  L  e.  CC )
1817negidd 8220 . . . . . . . . 9  |-  ( (
ph  /\  L  <  0 )  ->  ( L  +  -u L )  =  0 )
1918breq2d 4001 . . . . . . . 8  |-  ( (
ph  /\  L  <  0 )  ->  (
( F `  i
)  <  ( L  +  -u L )  <->  ( F `  i )  <  0
) )
2016, 19syl5ib 153 . . . . . . 7  |-  ( (
ph  /\  L  <  0 )  ->  (
( ( F `  i )  <  ( L  +  -u L )  /\  L  <  (
( F `  i
)  +  -u L
) )  ->  ( F `  i )  <  0 ) )
2120ralimdv 2538 . . . . . 6  |-  ( (
ph  /\  L  <  0 )  ->  ( A. i  e.  ( ZZ>=
`  j ) ( ( F `  i
)  <  ( L  +  -u L )  /\  L  <  ( ( F `
 i )  + 
-u L ) )  ->  A. i  e.  (
ZZ>= `  j ) ( F `  i )  <  0 ) )
2221reximdv 2571 . . . . 5  |-  ( (
ph  /\  L  <  0 )  ->  ( E. j  e.  NN  A. i  e.  ( ZZ>= `  j ) ( ( F `  i )  <  ( L  +  -u L )  /\  L  <  ( ( F `  i )  +  -u L ) )  ->  E. j  e.  NN  A. i  e.  ( ZZ>= `  j ) ( F `
 i )  <  0 ) )
2315, 22mpd 13 . . . 4  |-  ( (
ph  /\  L  <  0 )  ->  E. j  e.  NN  A. i  e.  ( ZZ>= `  j )
( F `  i
)  <  0 )
24 0red 7921 . . . . . . . . . . 11  |-  ( (
ph  /\  ( j  e.  NN  /\  i  e.  ( ZZ>= `  j )
) )  ->  0  e.  RR )
25 eluznn 9559 . . . . . . . . . . . . 13  |-  ( ( j  e.  NN  /\  i  e.  ( ZZ>= `  j ) )  -> 
i  e.  NN )
26 resqrexlemex.seq . . . . . . . . . . . . . . 15  |-  F  =  seq 1 ( ( y  e.  RR+ ,  z  e.  RR+  |->  ( ( y  +  ( A  /  y ) )  /  2 ) ) ,  ( NN  X.  { ( 1  +  A ) } ) )
27 resqrexlemex.a . . . . . . . . . . . . . . 15  |-  ( ph  ->  A  e.  RR )
28 resqrexlemex.agt0 . . . . . . . . . . . . . . 15  |-  ( ph  ->  0  <_  A )
2926, 27, 28resqrexlemf 10971 . . . . . . . . . . . . . 14  |-  ( ph  ->  F : NN --> RR+ )
3029ffvelrnda 5631 . . . . . . . . . . . . 13  |-  ( (
ph  /\  i  e.  NN )  ->  ( F `
 i )  e.  RR+ )
3125, 30sylan2 284 . . . . . . . . . . . 12  |-  ( (
ph  /\  ( j  e.  NN  /\  i  e.  ( ZZ>= `  j )
) )  ->  ( F `  i )  e.  RR+ )
3231rpred 9653 . . . . . . . . . . 11  |-  ( (
ph  /\  ( j  e.  NN  /\  i  e.  ( ZZ>= `  j )
) )  ->  ( F `  i )  e.  RR )
3331rpgt0d 9656 . . . . . . . . . . 11  |-  ( (
ph  /\  ( j  e.  NN  /\  i  e.  ( ZZ>= `  j )
) )  ->  0  <  ( F `  i
) )
3424, 32, 33ltnsymd 8039 . . . . . . . . . 10  |-  ( (
ph  /\  ( j  e.  NN  /\  i  e.  ( ZZ>= `  j )
) )  ->  -.  ( F `  i )  <  0 )
3534pm2.21d 614 . . . . . . . . 9  |-  ( (
ph  /\  ( j  e.  NN  /\  i  e.  ( ZZ>= `  j )
) )  ->  (
( F `  i
)  <  0  -> F.  ) )
3635anassrs 398 . . . . . . . 8  |-  ( ( ( ph  /\  j  e.  NN )  /\  i  e.  ( ZZ>= `  j )
)  ->  ( ( F `  i )  <  0  -> F.  )
)
3736ralimdva 2537 . . . . . . 7  |-  ( (
ph  /\  j  e.  NN )  ->  ( A. i  e.  ( ZZ>= `  j ) ( F `
 i )  <  0  ->  A. i  e.  ( ZZ>= `  j ) F.  ) )
38 nnz 9231 . . . . . . . . 9  |-  ( j  e.  NN  ->  j  e.  ZZ )
39 uzid 9501 . . . . . . . . . 10  |-  ( j  e.  ZZ  ->  j  e.  ( ZZ>= `  j )
)
40 elex2 2746 . . . . . . . . . 10  |-  ( j  e.  ( ZZ>= `  j
)  ->  E. z 
z  e.  ( ZZ>= `  j ) )
41 r19.3rmv 3505 . . . . . . . . . 10  |-  ( E. z  z  e.  (
ZZ>= `  j )  -> 
( F.  <->  A. i  e.  ( ZZ>= `  j ) F.  ) )
4239, 40, 413syl 17 . . . . . . . . 9  |-  ( j  e.  ZZ  ->  ( F. 
<-> 
A. i  e.  (
ZZ>= `  j ) F.  ) )
4338, 42syl 14 . . . . . . . 8  |-  ( j  e.  NN  ->  ( F. 
<-> 
A. i  e.  (
ZZ>= `  j ) F.  ) )
4443adantl 275 . . . . . . 7  |-  ( (
ph  /\  j  e.  NN )  ->  ( F.  <->  A. i  e.  ( ZZ>=
`  j ) F.  ) )
4537, 44sylibrd 168 . . . . . 6  |-  ( (
ph  /\  j  e.  NN )  ->  ( A. i  e.  ( ZZ>= `  j ) ( F `
 i )  <  0  -> F.  )
)
4645rexlimdva 2587 . . . . 5  |-  ( ph  ->  ( E. j  e.  NN  A. i  e.  ( ZZ>= `  j )
( F `  i
)  <  0  -> F.  ) )
4746adantr 274 . . . 4  |-  ( (
ph  /\  L  <  0 )  ->  ( E. j  e.  NN  A. i  e.  ( ZZ>= `  j ) ( F `
 i )  <  0  -> F.  )
)
4823, 47mpd 13 . . 3  |-  ( (
ph  /\  L  <  0 )  -> F.  )
4948inegd 1367 . 2  |-  ( ph  ->  -.  L  <  0
)
50 0re 7920 . . 3  |-  0  e.  RR
51 lenlt 7995 . . 3  |-  ( ( 0  e.  RR  /\  L  e.  RR )  ->  ( 0  <_  L  <->  -.  L  <  0 ) )
5250, 9, 51sylancr 412 . 2  |-  ( ph  ->  ( 0  <_  L  <->  -.  L  <  0 ) )
5349, 52mpbird 166 1  |-  ( ph  ->  0  <_  L )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 103    <-> wb 104    = wceq 1348   F. wfal 1353   E.wex 1485    e. wcel 2141   A.wral 2448   E.wrex 2449   {csn 3583   class class class wbr 3989    X. cxp 4609   ` cfv 5198  (class class class)co 5853    e. cmpo 5855   RRcr 7773   0cc0 7774   1c1 7775    + caddc 7777    < clt 7954    <_ cle 7955   -ucneg 8091    / cdiv 8589   NNcn 8878   2c2 8929   ZZcz 9212   ZZ>=cuz 9487   RR+crp 9610    seqcseq 10401
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-coll 4104  ax-sep 4107  ax-nul 4115  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-iinf 4572  ax-cnex 7865  ax-resscn 7866  ax-1cn 7867  ax-1re 7868  ax-icn 7869  ax-addcl 7870  ax-addrcl 7871  ax-mulcl 7872  ax-mulrcl 7873  ax-addcom 7874  ax-mulcom 7875  ax-addass 7876  ax-mulass 7877  ax-distr 7878  ax-i2m1 7879  ax-0lt1 7880  ax-1rid 7881  ax-0id 7882  ax-rnegex 7883  ax-precex 7884  ax-cnre 7885  ax-pre-ltirr 7886  ax-pre-ltwlin 7887  ax-pre-lttrn 7888  ax-pre-apti 7889  ax-pre-ltadd 7890  ax-pre-mulgt0 7891  ax-pre-mulext 7892
This theorem depends on definitions:  df-bi 116  df-3or 974  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-nel 2436  df-ral 2453  df-rex 2454  df-reu 2455  df-rmo 2456  df-rab 2457  df-v 2732  df-sbc 2956  df-csb 3050  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-int 3832  df-iun 3875  df-br 3990  df-opab 4051  df-mpt 4052  df-tr 4088  df-id 4278  df-po 4281  df-iso 4282  df-iord 4351  df-on 4353  df-ilim 4354  df-suc 4356  df-iom 4575  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-f 5202  df-f1 5203  df-fo 5204  df-f1o 5205  df-fv 5206  df-riota 5809  df-ov 5856  df-oprab 5857  df-mpo 5858  df-1st 6119  df-2nd 6120  df-recs 6284  df-frec 6370  df-pnf 7956  df-mnf 7957  df-xr 7958  df-ltxr 7959  df-le 7960  df-sub 8092  df-neg 8093  df-reap 8494  df-ap 8501  df-div 8590  df-inn 8879  df-2 8937  df-n0 9136  df-z 9213  df-uz 9488  df-rp 9611  df-seqfrec 10402
This theorem is referenced by:  resqrexlemglsq  10986  resqrexlemex  10989
  Copyright terms: Public domain W3C validator