Users' Mathboxes Mathbox for Stefan O'Rear < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  irrapx1 Unicode version

Theorem irrapx1 26324
Description: Dirichlet's approximation theorem. Every positive irrational number has infinitely many rational approximations which are closer than the inverse squares of their reduced denominators. Lemma 61 in [vandenDries] p. 42. (Contributed by Stefan O'Rear, 14-Sep-2014.)
Assertion
Ref Expression
irrapx1  |-  ( A  e.  ( RR+  \  QQ )  ->  { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  < 
( (denom `  y
) ^ -u 2
) ) }  ~~  NN )
Distinct variable group:    y, A

Proof of Theorem irrapx1
Dummy variables  a 
b are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 qnnen 12488 . . . 4  |-  QQ  ~~  NN
2 nnenom 11038 . . . 4  |-  NN  ~~  om
31, 2entri 6911 . . 3  |-  QQ  ~~  om
43, 2pm3.2i 441 . 2  |-  ( QQ 
~~  om  /\  NN  ~~  om )
5 ssrab2 3259 . . . . . 6  |-  { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  <  ( (denom `  y ) ^ -u 2
) ) }  C_  QQ
6 qssre 10322 . . . . . 6  |-  QQ  C_  RR
75, 6sstri 3189 . . . . 5  |-  { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  <  ( (denom `  y ) ^ -u 2
) ) }  C_  RR
87a1i 10 . . . 4  |-  ( A  e.  ( RR+  \  QQ )  ->  { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  < 
( (denom `  y
) ^ -u 2
) ) }  C_  RR )
9 eldifi 3299 . . . . 5  |-  ( A  e.  ( RR+  \  QQ )  ->  A  e.  RR+ )
109rpred 10386 . . . 4  |-  ( A  e.  ( RR+  \  QQ )  ->  A  e.  RR )
11 eldifn 3300 . . . . 5  |-  ( A  e.  ( RR+  \  QQ )  ->  -.  A  e.  QQ )
125sseli 3177 . . . . 5  |-  ( A  e.  { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  < 
( (denom `  y
) ^ -u 2
) ) }  ->  A  e.  QQ )
1311, 12nsyl 113 . . . 4  |-  ( A  e.  ( RR+  \  QQ )  ->  -.  A  e.  { y  e.  QQ  | 
( 0  <  y  /\  ( abs `  (
y  -  A ) )  <  ( (denom `  y ) ^ -u 2
) ) } )
14 irrapxlem6 26323 . . . . . 6  |-  ( ( A  e.  RR+  /\  a  e.  RR+ )  ->  E. b  e.  { y  e.  QQ  |  ( 0  < 
y  /\  ( abs `  ( y  -  A
) )  <  (
(denom `  y ) ^ -u 2 ) ) }  ( abs `  (
b  -  A ) )  <  a )
159, 14sylan 457 . . . . 5  |-  ( ( A  e.  ( RR+  \  QQ )  /\  a  e.  RR+ )  ->  E. b  e.  { y  e.  QQ  |  ( 0  < 
y  /\  ( abs `  ( y  -  A
) )  <  (
(denom `  y ) ^ -u 2 ) ) }  ( abs `  (
b  -  A ) )  <  a )
1615ralrimiva 2627 . . . 4  |-  ( A  e.  ( RR+  \  QQ )  ->  A. a  e.  RR+  E. b  e.  { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  <  ( (denom `  y ) ^ -u 2
) ) }  ( abs `  ( b  -  A ) )  < 
a )
17 rencldnfi 26315 . . . 4  |-  ( ( ( { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  < 
( (denom `  y
) ^ -u 2
) ) }  C_  RR  /\  A  e.  RR  /\ 
-.  A  e.  {
y  e.  QQ  | 
( 0  <  y  /\  ( abs `  (
y  -  A ) )  <  ( (denom `  y ) ^ -u 2
) ) } )  /\  A. a  e.  RR+  E. b  e.  {
y  e.  QQ  | 
( 0  <  y  /\  ( abs `  (
y  -  A ) )  <  ( (denom `  y ) ^ -u 2
) ) }  ( abs `  ( b  -  A ) )  < 
a )  ->  -.  { y  e.  QQ  | 
( 0  <  y  /\  ( abs `  (
y  -  A ) )  <  ( (denom `  y ) ^ -u 2
) ) }  e.  Fin )
188, 10, 13, 16, 17syl31anc 1185 . . 3  |-  ( A  e.  ( RR+  \  QQ )  ->  -.  { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  < 
( (denom `  y
) ^ -u 2
) ) }  e.  Fin )
1918, 5jctil 523 . 2  |-  ( A  e.  ( RR+  \  QQ )  ->  ( { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  <  ( (denom `  y ) ^ -u 2
) ) }  C_  QQ  /\  -.  { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  <  ( (denom `  y ) ^ -u 2
) ) }  e.  Fin ) )
20 ctbnfien 26312 . 2  |-  ( ( ( QQ  ~~  om  /\  NN  ~~  om )  /\  ( { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  < 
( (denom `  y
) ^ -u 2
) ) }  C_  QQ  /\  -.  { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  <  ( (denom `  y ) ^ -u 2
) ) }  e.  Fin ) )  ->  { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  <  ( (denom `  y ) ^ -u 2
) ) }  ~~  NN )
214, 19, 20sylancr 644 1  |-  ( A  e.  ( RR+  \  QQ )  ->  { y  e.  QQ  |  ( 0  <  y  /\  ( abs `  ( y  -  A ) )  < 
( (denom `  y
) ^ -u 2
) ) }  ~~  NN )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 358    e. wcel 1685   A.wral 2544   E.wrex 2545   {crab 2548    \ cdif 3150    C_ wss 3153   class class class wbr 4024   omcom 4655   ` cfv 5221  (class class class)co 5820    ~~ cen 6856   Fincfn 6859   RRcr 8732   0cc0 8733    < clt 8863    - cmin 9033   -ucneg 9034   NNcn 9742   2c2 9791   QQcq 10312   RR+crp 10350   ^cexp 11100   abscabs 11715  denomcdenom 12801
This theorem is referenced by:  pellexlem4  26328
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1636  ax-8 1644  ax-13 1687  ax-14 1689  ax-6 1704  ax-7 1709  ax-11 1716  ax-12 1868  ax-ext 2265  ax-rep 4132  ax-sep 4142  ax-nul 4150  ax-pow 4187  ax-pr 4213  ax-un 4511  ax-inf2 7338  ax-cnex 8789  ax-resscn 8790  ax-1cn 8791  ax-icn 8792  ax-addcl 8793  ax-addrcl 8794  ax-mulcl 8795  ax-mulrcl 8796  ax-mulcom 8797  ax-addass 8798  ax-mulass 8799  ax-distr 8800  ax-i2m1 8801  ax-1ne0 8802  ax-1rid 8803  ax-rnegex 8804  ax-rrecex 8805  ax-cnre 8806  ax-pre-lttri 8807  ax-pre-lttrn 8808  ax-pre-ltadd 8809  ax-pre-mulgt0 8810  ax-pre-sup 8811
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1631  df-eu 2148  df-mo 2149  df-clab 2271  df-cleq 2277  df-clel 2280  df-nfc 2409  df-ne 2449  df-nel 2450  df-ral 2549  df-rex 2550  df-reu 2551  df-rmo 2552  df-rab 2553  df-v 2791  df-sbc 2993  df-csb 3083  df-dif 3156  df-un 3158  df-in 3160  df-ss 3167  df-pss 3169  df-nul 3457  df-if 3567  df-pw 3628  df-sn 3647  df-pr 3648  df-tp 3649  df-op 3650  df-uni 3829  df-int 3864  df-iun 3908  df-br 4025  df-opab 4079  df-mpt 4080  df-tr 4115  df-eprel 4304  df-id 4308  df-po 4313  df-so 4314  df-fr 4351  df-se 4352  df-we 4353  df-ord 4394  df-on 4395  df-lim 4396  df-suc 4397  df-om 4656  df-xp 4694  df-rel 4695  df-cnv 4696  df-co 4697  df-dm 4698  df-rn 4699  df-res 4700  df-ima 4701  df-fun 5223  df-fn 5224  df-f 5225  df-f1 5226  df-fo 5227  df-f1o 5228  df-fv 5229  df-isom 5230  df-ov 5823  df-oprab 5824  df-mpt2 5825  df-1st 6084  df-2nd 6085  df-iota 6253  df-riota 6300  df-recs 6384  df-rdg 6419  df-1o 6475  df-oadd 6479  df-omul 6480  df-er 6656  df-map 6770  df-en 6860  df-dom 6861  df-sdom 6862  df-fin 6863  df-sup 7190  df-oi 7221  df-card 7568  df-acn 7571  df-pnf 8865  df-mnf 8866  df-xr 8867  df-ltxr 8868  df-le 8869  df-sub 9035  df-neg 9036  df-div 9420  df-nn 9743  df-2 9800  df-3 9801  df-n0 9962  df-z 10021  df-uz 10227  df-q 10313  df-rp 10351  df-ico 10658  df-fz 10779  df-fl 10921  df-mod 10970  df-seq 11043  df-exp 11101  df-hash 11334  df-cj 11580  df-re 11581  df-im 11582  df-sqr 11716  df-abs 11717  df-dvds 12528  df-gcd 12682  df-numer 12802  df-denom 12803
  Copyright terms: Public domain W3C validator