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Theorem resqrexlemgt0 10962
Description: Lemma for resqrex 10968. 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 5850 . . . . . . . . 9  |-  ( e  =  -u L  ->  ( L  +  e )  =  ( L  +  -u L ) )
21breq2d 3994 . . . . . . . 8  |-  ( e  =  -u L  ->  (
( F `  i
)  <  ( L  +  e )  <->  ( F `  i )  <  ( L  +  -u L ) ) )
3 oveq2 5850 . . . . . . . . 9  |-  ( e  =  -u L  ->  (
( F `  i
)  +  e )  =  ( ( F `
 i )  + 
-u L ) )
43breq2d 3994 . . . . . . . 8  |-  ( e  =  -u L  ->  ( L  <  ( ( F `
 i )  +  e )  <->  L  <  ( ( F `  i
)  +  -u L
) ) )
52, 4anbi12d 465 . . . . . . 7  |-  ( e  =  -u L  ->  (
( ( F `  i )  <  ( L  +  e )  /\  L  <  ( ( F `  i )  +  e ) )  <-> 
( ( F `  i )  <  ( L  +  -u L )  /\  L  <  (
( F `  i
)  +  -u L
) ) ) )
65rexralbidv 2492 . . . . . 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 8278 . . . . . . 7  |-  ( (
ph  /\  L  <  0 )  ->  -u L  e.  RR )
129lt0neg1d 8413 . . . . . . . 8  |-  ( ph  ->  ( L  <  0  <->  0  <  -u L ) )
1312biimpa 294 . . . . . . 7  |-  ( (
ph  /\  L  <  0 )  ->  0  <  -u L )
1411, 13elrpd 9629 . . . . . 6  |-  ( (
ph  /\  L  <  0 )  ->  -u L  e.  RR+ )
156, 8, 14rspcdva 2835 . . . . 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 7927 . . . . . . . . . 10  |-  ( (
ph  /\  L  <  0 )  ->  L  e.  CC )
1817negidd 8199 . . . . . . . . 9  |-  ( (
ph  /\  L  <  0 )  ->  ( L  +  -u L )  =  0 )
1918breq2d 3994 . . . . . . . 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 2534 . . . . . 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 2567 . . . . 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 7900 . . . . . . . . . . 11  |-  ( (
ph  /\  ( j  e.  NN  /\  i  e.  ( ZZ>= `  j )
) )  ->  0  e.  RR )
25 eluznn 9538 . . . . . . . . . . . . 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 10949 . . . . . . . . . . . . . 14  |-  ( ph  ->  F : NN --> RR+ )
3029ffvelrnda 5620 . . . . . . . . . . . . 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 9632 . . . . . . . . . . 11  |-  ( (
ph  /\  ( j  e.  NN  /\  i  e.  ( ZZ>= `  j )
) )  ->  ( F `  i )  e.  RR )
3331rpgt0d 9635 . . . . . . . . . . 11  |-  ( (
ph  /\  ( j  e.  NN  /\  i  e.  ( ZZ>= `  j )
) )  ->  0  <  ( F `  i
) )
3424, 32, 33ltnsymd 8018 . . . . . . . . . 10  |-  ( (
ph  /\  ( j  e.  NN  /\  i  e.  ( ZZ>= `  j )
) )  ->  -.  ( F `  i )  <  0 )
3534pm2.21d 609 . . . . . . . . 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 2533 . . . . . . 7  |-  ( (
ph  /\  j  e.  NN )  ->  ( A. i  e.  ( ZZ>= `  j ) ( F `
 i )  <  0  ->  A. i  e.  ( ZZ>= `  j ) F.  ) )
38 nnz 9210 . . . . . . . . 9  |-  ( j  e.  NN  ->  j  e.  ZZ )
39 uzid 9480 . . . . . . . . . 10  |-  ( j  e.  ZZ  ->  j  e.  ( ZZ>= `  j )
)
40 elex2 2742 . . . . . . . . . 10  |-  ( j  e.  ( ZZ>= `  j
)  ->  E. z 
z  e.  ( ZZ>= `  j ) )
41 r19.3rmv 3499 . . . . . . . . . 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 2583 . . . . 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 1362 . 2  |-  ( ph  ->  -.  L  <  0
)
50 0re 7899 . . 3  |-  0  e.  RR
51 lenlt 7974 . . 3  |-  ( ( 0  e.  RR  /\  L  e.  RR )  ->  ( 0  <_  L  <->  -.  L  <  0 ) )
5250, 9, 51sylancr 411 . 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 1343   F. wfal 1348   E.wex 1480    e. wcel 2136   A.wral 2444   E.wrex 2445   {csn 3576   class class class wbr 3982    X. cxp 4602   ` cfv 5188  (class class class)co 5842    e. cmpo 5844   RRcr 7752   0cc0 7753   1c1 7754    + caddc 7756    < clt 7933    <_ cle 7934   -ucneg 8070    / cdiv 8568   NNcn 8857   2c2 8908   ZZcz 9191   ZZ>=cuz 9466   RR+crp 9589    seqcseq 10380
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 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-nul 4108  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-iinf 4565  ax-cnex 7844  ax-resscn 7845  ax-1cn 7846  ax-1re 7847  ax-icn 7848  ax-addcl 7849  ax-addrcl 7850  ax-mulcl 7851  ax-mulrcl 7852  ax-addcom 7853  ax-mulcom 7854  ax-addass 7855  ax-mulass 7856  ax-distr 7857  ax-i2m1 7858  ax-0lt1 7859  ax-1rid 7860  ax-0id 7861  ax-rnegex 7862  ax-precex 7863  ax-cnre 7864  ax-pre-ltirr 7865  ax-pre-ltwlin 7866  ax-pre-lttrn 7867  ax-pre-apti 7868  ax-pre-ltadd 7869  ax-pre-mulgt0 7870  ax-pre-mulext 7871
This theorem depends on definitions:  df-bi 116  df-3or 969  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-nel 2432  df-ral 2449  df-rex 2450  df-reu 2451  df-rmo 2452  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-int 3825  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-tr 4081  df-id 4271  df-po 4274  df-iso 4275  df-iord 4344  df-on 4346  df-ilim 4347  df-suc 4349  df-iom 4568  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-riota 5798  df-ov 5845  df-oprab 5846  df-mpo 5847  df-1st 6108  df-2nd 6109  df-recs 6273  df-frec 6359  df-pnf 7935  df-mnf 7936  df-xr 7937  df-ltxr 7938  df-le 7939  df-sub 8071  df-neg 8072  df-reap 8473  df-ap 8480  df-div 8569  df-inn 8858  df-2 8916  df-n0 9115  df-z 9192  df-uz 9467  df-rp 9590  df-seqfrec 10381
This theorem is referenced by:  resqrexlemglsq  10964  resqrexlemex  10967
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