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

Theorem bndndx 9083
Description: A bounded real sequence  A (
k ) is less than or equal to at least one of its indices. (Contributed by NM, 18-Jan-2008.)
Assertion
Ref Expression
bndndx  |-  ( E. x  e.  RR  A. k  e.  NN  ( A  e.  RR  /\  A  <_  x )  ->  E. k  e.  NN  A  <_  k
)
Distinct variable groups:    x, A    x, k
Allowed substitution hint:    A( k)

Proof of Theorem bndndx
StepHypRef Expression
1 arch 9081 . . . 4  |-  ( x  e.  RR  ->  E. k  e.  NN  x  <  k
)
2 nnre 8834 . . . . . 6  |-  ( k  e.  NN  ->  k  e.  RR )
3 lelttr 7959 . . . . . . . . . . 11  |-  ( ( A  e.  RR  /\  x  e.  RR  /\  k  e.  RR )  ->  (
( A  <_  x  /\  x  <  k )  ->  A  <  k
) )
4 ltle 7958 . . . . . . . . . . . 12  |-  ( ( A  e.  RR  /\  k  e.  RR )  ->  ( A  <  k  ->  A  <_  k )
)
543adant2 1001 . . . . . . . . . . 11  |-  ( ( A  e.  RR  /\  x  e.  RR  /\  k  e.  RR )  ->  ( A  <  k  ->  A  <_  k ) )
63, 5syld 45 . . . . . . . . . 10  |-  ( ( A  e.  RR  /\  x  e.  RR  /\  k  e.  RR )  ->  (
( A  <_  x  /\  x  <  k )  ->  A  <_  k
) )
76exp5o 1208 . . . . . . . . 9  |-  ( A  e.  RR  ->  (
x  e.  RR  ->  ( k  e.  RR  ->  ( A  <_  x  ->  ( x  <  k  ->  A  <_  k ) ) ) ) )
87com3l 81 . . . . . . . 8  |-  ( x  e.  RR  ->  (
k  e.  RR  ->  ( A  e.  RR  ->  ( A  <_  x  ->  ( x  <  k  ->  A  <_  k ) ) ) ) )
98imp4b 348 . . . . . . 7  |-  ( ( x  e.  RR  /\  k  e.  RR )  ->  ( ( A  e.  RR  /\  A  <_  x )  ->  (
x  <  k  ->  A  <_  k ) ) )
109com23 78 . . . . . 6  |-  ( ( x  e.  RR  /\  k  e.  RR )  ->  ( x  <  k  ->  ( ( A  e.  RR  /\  A  <_  x )  ->  A  <_  k ) ) )
112, 10sylan2 284 . . . . 5  |-  ( ( x  e.  RR  /\  k  e.  NN )  ->  ( x  <  k  ->  ( ( A  e.  RR  /\  A  <_  x )  ->  A  <_  k ) ) )
1211reximdva 2559 . . . 4  |-  ( x  e.  RR  ->  ( E. k  e.  NN  x  <  k  ->  E. k  e.  NN  ( ( A  e.  RR  /\  A  <_  x )  ->  A  <_  k ) ) )
131, 12mpd 13 . . 3  |-  ( x  e.  RR  ->  E. k  e.  NN  ( ( A  e.  RR  /\  A  <_  x )  ->  A  <_  k ) )
14 r19.35-1 2607 . . 3  |-  ( E. k  e.  NN  (
( A  e.  RR  /\  A  <_  x )  ->  A  <_  k )  ->  ( A. k  e.  NN  ( A  e.  RR  /\  A  <_  x )  ->  E. k  e.  NN  A  <_  k
) )
1513, 14syl 14 . 2  |-  ( x  e.  RR  ->  ( A. k  e.  NN  ( A  e.  RR  /\  A  <_  x )  ->  E. k  e.  NN  A  <_  k ) )
1615rexlimiv 2568 1  |-  ( E. x  e.  RR  A. k  e.  NN  ( A  e.  RR  /\  A  <_  x )  ->  E. k  e.  NN  A  <_  k
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    /\ w3a 963    e. wcel 2128   A.wral 2435   E.wrex 2436   class class class wbr 3965   RRcr 7725    < clt 7906    <_ cle 7907   NNcn 8827
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 1427  ax-7 1428  ax-gen 1429  ax-ie1 1473  ax-ie2 1474  ax-8 1484  ax-10 1485  ax-11 1486  ax-i12 1487  ax-bndl 1489  ax-4 1490  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-13 2130  ax-14 2131  ax-ext 2139  ax-sep 4082  ax-pow 4135  ax-pr 4169  ax-un 4393  ax-setind 4495  ax-cnex 7817  ax-resscn 7818  ax-1re 7820  ax-addrcl 7823  ax-pre-ltirr 7838  ax-pre-ltwlin 7839  ax-pre-lttrn 7840  ax-arch 7845
This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1338  df-fal 1341  df-nf 1441  df-sb 1743  df-eu 2009  df-mo 2010  df-clab 2144  df-cleq 2150  df-clel 2153  df-nfc 2288  df-ne 2328  df-nel 2423  df-ral 2440  df-rex 2441  df-rab 2444  df-v 2714  df-dif 3104  df-un 3106  df-in 3108  df-ss 3115  df-pw 3545  df-sn 3566  df-pr 3567  df-op 3569  df-uni 3773  df-int 3808  df-br 3966  df-opab 4026  df-xp 4591  df-cnv 4593  df-pnf 7908  df-mnf 7909  df-xr 7910  df-ltxr 7911  df-le 7912  df-inn 8828
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator