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

Theorem arch 9398
Description: Archimedean property of real numbers. For any real number, there is an integer greater than it. Theorem I.29 of [Apostol] p. 26. (Contributed by NM, 21-Jan-1997.)
Assertion
Ref Expression
arch  |-  ( A  e.  RR  ->  E. n  e.  NN  A  <  n
)
Distinct variable group:    A, n

Proof of Theorem arch
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ax-arch 8150 . . 3  |-  ( A  e.  RR  ->  E. n  e.  |^| { x  |  ( 1  e.  x  /\  A. y  e.  x  ( y  +  1 )  e.  x ) } A  <RR  n )
2 dfnn2 9144 . . . 4  |-  NN  =  |^| { x  |  ( 1  e.  x  /\  A. y  e.  x  ( y  +  1 )  e.  x ) }
32rexeqi 2735 . . 3  |-  ( E. n  e.  NN  A  <RR  n  <->  E. n  e.  |^| { x  |  ( 1  e.  x  /\  A. y  e.  x  (
y  +  1 )  e.  x ) } A  <RR  n )
41, 3sylibr 134 . 2  |-  ( A  e.  RR  ->  E. n  e.  NN  A  <RR  n )
5 nnre 9149 . . . 4  |-  ( n  e.  NN  ->  n  e.  RR )
6 ltxrlt 8244 . . . 4  |-  ( ( A  e.  RR  /\  n  e.  RR )  ->  ( A  <  n  <->  A 
<RR  n ) )
75, 6sylan2 286 . . 3  |-  ( ( A  e.  RR  /\  n  e.  NN )  ->  ( A  <  n  <->  A 
<RR  n ) )
87rexbidva 2529 . 2  |-  ( A  e.  RR  ->  ( E. n  e.  NN  A  <  n  <->  E. n  e.  NN  A  <RR  n ) )
94, 8mpbird 167 1  |-  ( A  e.  RR  ->  E. n  e.  NN  A  <  n
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105    e. wcel 2202   {cab 2217   A.wral 2510   E.wrex 2511   |^|cint 3928   class class class wbr 4088  (class class class)co 6017   RRcr 8030   1c1 8032    + caddc 8034    <RR cltrr 8035    < clt 8213   NNcn 9142
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-1re 8125  ax-addrcl 8128  ax-arch 8150
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-br 4089  df-opab 4151  df-xp 4731  df-pnf 8215  df-mnf 8216  df-ltxr 8218  df-inn 9143
This theorem is referenced by:  nnrecl  9399  bndndx  9400  btwnz  9598  expnbnd  10924  cvg1nlemres  11545  cvg1n  11546  resqrexlemga  11583  fsum3cvg3  11956  divcnv  12057  efcllem  12219  alzdvds  12414  dvdsbnd  12526
  Copyright terms: Public domain W3C validator