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Theorem infcvgaux1i 12315
Description: Auxiliary theorem for applications of supcvg 12314. Hypothesis for several supremum theorems. (Contributed by NM, 8-Feb-2008.)
Hypotheses
Ref Expression
infcvg.1  |-  R  =  { x  |  E. y  e.  X  x  =  -u A }
infcvg.2  |-  ( y  e.  X  ->  A  e.  RR )
infcvg.3  |-  Z  e.  X
infcvg.4  |-  E. z  e.  RR  A. w  e.  R  w  <_  z
Assertion
Ref Expression
infcvgaux1i  |-  ( R 
C_  RR  /\  R  =/=  (/)  /\  E. z  e.  RR  A. w  e.  R  w  <_  z
)
Distinct variable groups:    x, A    x, y    z, w, R   
x, X, y    x, Z, y
Allowed substitution hints:    A( y, z, w)    R( x, y)    X( z, w)    Z( z, w)

Proof of Theorem infcvgaux1i
StepHypRef Expression
1 infcvg.1 . . 3  |-  R  =  { x  |  E. y  e.  X  x  =  -u A }
2 infcvg.2 . . . . . . 7  |-  ( y  e.  X  ->  A  e.  RR )
32renegcld 9210 . . . . . 6  |-  ( y  e.  X  ->  -u A  e.  RR )
4 eleq1 2343 . . . . . 6  |-  ( x  =  -u A  ->  (
x  e.  RR  <->  -u A  e.  RR ) )
53, 4syl5ibrcom 213 . . . . 5  |-  ( y  e.  X  ->  (
x  =  -u A  ->  x  e.  RR ) )
65rexlimiv 2661 . . . 4  |-  ( E. y  e.  X  x  =  -u A  ->  x  e.  RR )
76abssi 3248 . . 3  |-  { x  |  E. y  e.  X  x  =  -u A }  C_  RR
81, 7eqsstri 3208 . 2  |-  R  C_  RR
9 infcvg.3 . . . . . 6  |-  Z  e.  X
10 eqid 2283 . . . . . 6  |-  -u [_ Z  /  y ]_ A  =  -u [_ Z  / 
y ]_ A
1110nfth 1540 . . . . . . 7  |-  F/ y
-u [_ Z  /  y ]_ A  =  -u [_ Z  /  y ]_ A
12 csbeq1a 3089 . . . . . . . . 9  |-  ( y  =  Z  ->  A  =  [_ Z  /  y ]_ A )
1312negeqd 9046 . . . . . . . 8  |-  ( y  =  Z  ->  -u A  =  -u [_ Z  / 
y ]_ A )
1413eqeq2d 2294 . . . . . . 7  |-  ( y  =  Z  ->  ( -u
[_ Z  /  y ]_ A  =  -u A  <->  -u
[_ Z  /  y ]_ A  =  -u [_ Z  /  y ]_ A
) )
1511, 14rspce 2879 . . . . . 6  |-  ( ( Z  e.  X  /\  -u
[_ Z  /  y ]_ A  =  -u [_ Z  /  y ]_ A
)  ->  E. y  e.  X  -u [_ Z  /  y ]_ A  =  -u A )
169, 10, 15mp2an 653 . . . . 5  |-  E. y  e.  X  -u [_ Z  /  y ]_ A  =  -u A
17 negex 9050 . . . . . 6  |-  -u [_ Z  /  y ]_ A  e.  _V
18 nfcsb1v 3113 . . . . . . . . 9  |-  F/_ y [_ Z  /  y ]_ A
1918nfneg 9048 . . . . . . . 8  |-  F/_ y -u
[_ Z  /  y ]_ A
2019nfeq2 2430 . . . . . . 7  |-  F/ y  x  =  -u [_ Z  /  y ]_ A
21 eqeq1 2289 . . . . . . 7  |-  ( x  =  -u [_ Z  / 
y ]_ A  ->  (
x  =  -u A  <->  -u
[_ Z  /  y ]_ A  =  -u A
) )
2220, 21rexbid 2562 . . . . . 6  |-  ( x  =  -u [_ Z  / 
y ]_ A  ->  ( E. y  e.  X  x  =  -u A  <->  E. y  e.  X  -u [_ Z  /  y ]_ A  =  -u A ) )
2317, 22elab 2914 . . . . 5  |-  ( -u [_ Z  /  y ]_ A  e.  { x  |  E. y  e.  X  x  =  -u A }  <->  E. y  e.  X  -u [_ Z  /  y ]_ A  =  -u A )
2416, 23mpbir 200 . . . 4  |-  -u [_ Z  /  y ]_ A  e.  { x  |  E. y  e.  X  x  =  -u A }
2524, 1eleqtrri 2356 . . 3  |-  -u [_ Z  /  y ]_ A  e.  R
26 ne0i 3461 . . 3  |-  ( -u [_ Z  /  y ]_ A  e.  R  ->  R  =/=  (/) )
2725, 26ax-mp 8 . 2  |-  R  =/=  (/)
28 infcvg.4 . 2  |-  E. z  e.  RR  A. w  e.  R  w  <_  z
298, 27, 283pm3.2i 1130 1  |-  ( R 
C_  RR  /\  R  =/=  (/)  /\  E. z  e.  RR  A. w  e.  R  w  <_  z
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ w3a 934    = wceq 1623    e. wcel 1684   {cab 2269    =/= wne 2446   A.wral 2543   E.wrex 2544   [_csb 3081    C_ wss 3152   (/)c0 3455   class class class wbr 4023   RRcr 8736    <_ cle 8868   -ucneg 9038
This theorem is referenced by:  infcvgaux2i  12316
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 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512  ax-resscn 8794  ax-1cn 8795  ax-icn 8796  ax-addcl 8797  ax-addrcl 8798  ax-mulcl 8799  ax-mulrcl 8800  ax-mulcom 8801  ax-addass 8802  ax-mulass 8803  ax-distr 8804  ax-i2m1 8805  ax-1ne0 8806  ax-1rid 8807  ax-rnegex 8808  ax-rrecex 8809  ax-cnre 8810  ax-pre-lttri 8811  ax-pre-lttrn 8812  ax-pre-ltadd 8813
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 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-nel 2449  df-ral 2548  df-rex 2549  df-reu 2550  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-op 3649  df-uni 3828  df-br 4024  df-opab 4078  df-mpt 4079  df-id 4309  df-po 4314  df-so 4315  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-ov 5861  df-oprab 5862  df-mpt2 5863  df-riota 6304  df-er 6660  df-en 6864  df-dom 6865  df-sdom 6866  df-pnf 8869  df-mnf 8870  df-ltxr 8872  df-sub 9039  df-neg 9040
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