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Theorem arch 9404
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 8156 . . 3  |-  ( A  e.  RR  ->  E. n  e.  |^| { x  |  ( 1  e.  x  /\  A. y  e.  x  ( y  +  1 )  e.  x ) } A  <RR  n )
2 dfnn2 9150 . . . 4  |-  NN  =  |^| { x  |  ( 1  e.  x  /\  A. y  e.  x  ( y  +  1 )  e.  x ) }
32rexeqi 2734 . . 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 9155 . . . 4  |-  ( n  e.  NN  ->  n  e.  RR )
6 ltxrlt 8250 . . . 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 2528 . 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 2201   {cab 2216   A.wral 2509   E.wrex 2510   |^|cint 3929   class class class wbr 4089  (class class class)co 6023   RRcr 8036   1c1 8038    + caddc 8040    <RR cltrr 8041    < clt 8219   NNcn 9148
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 2203  ax-14 2204  ax-ext 2212  ax-sep 4208  ax-pow 4266  ax-pr 4301  ax-un 4532  ax-setind 4637  ax-cnex 8128  ax-resscn 8129  ax-1re 8131  ax-addrcl 8134  ax-arch 8156
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1810  df-eu 2081  df-mo 2082  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-ne 2402  df-nel 2497  df-ral 2514  df-rex 2515  df-rab 2518  df-v 2803  df-dif 3201  df-un 3203  df-in 3205  df-ss 3212  df-pw 3655  df-sn 3676  df-pr 3677  df-op 3679  df-uni 3895  df-int 3930  df-br 4090  df-opab 4152  df-xp 4733  df-pnf 8221  df-mnf 8222  df-ltxr 8224  df-inn 9149
This theorem is referenced by:  nnrecl  9405  bndndx  9406  btwnz  9604  expnbnd  10931  cvg1nlemres  11568  cvg1n  11569  resqrexlemga  11606  fsum3cvg3  11980  divcnv  12081  efcllem  12243  alzdvds  12438  dvdsbnd  12550
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