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Theorem elfz2 9765
Description: Membership in a finite set of sequential integers. We use the fact that an operation's value is empty outside of its domain to show  M  e.  ZZ and  N  e.  ZZ. (Contributed by NM, 6-Sep-2005.) (Revised by Mario Carneiro, 28-Apr-2015.)
Assertion
Ref Expression
elfz2  |-  ( K  e.  ( M ... N )  <->  ( ( M  e.  ZZ  /\  N  e.  ZZ  /\  K  e.  ZZ )  /\  ( M  <_  K  /\  K  <_  N ) ) )

Proof of Theorem elfz2
Dummy variables  x  y  z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 anass 398 . 2  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  K  e.  ZZ )  /\  ( M  <_  K  /\  K  <_  N ) )  <->  ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( K  e.  ZZ  /\  ( M  <_  K  /\  K  <_  N ) ) ) )
2 df-3an 949 . . 3  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ  /\  K  e.  ZZ )  <->  ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  K  e.  ZZ ) )
32anbi1i 453 . 2  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ  /\  K  e.  ZZ )  /\  ( M  <_  K  /\  K  <_  N ) )  <->  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  K  e.  ZZ )  /\  ( M  <_  K  /\  K  <_  N
) ) )
4 df-fz 9759 . . . 4  |-  ...  =  ( x  e.  ZZ ,  y  e.  ZZ  |->  { z  e.  ZZ  |  ( x  <_ 
z  /\  z  <_  y ) } )
54elmpocl 5936 . . 3  |-  ( K  e.  ( M ... N )  ->  ( M  e.  ZZ  /\  N  e.  ZZ ) )
6 simpl 108 . . 3  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( K  e.  ZZ  /\  ( M  <_  K  /\  K  <_  N ) ) )  ->  ( M  e.  ZZ  /\  N  e.  ZZ ) )
7 elfz1 9763 . . . 4  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( K  e.  ( M ... N )  <-> 
( K  e.  ZZ  /\  M  <_  K  /\  K  <_  N ) ) )
8 3anass 951 . . . . 5  |-  ( ( K  e.  ZZ  /\  M  <_  K  /\  K  <_  N )  <->  ( K  e.  ZZ  /\  ( M  <_  K  /\  K  <_  N ) ) )
9 ibar 299 . . . . 5  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( ( K  e.  ZZ  /\  ( M  <_  K  /\  K  <_  N ) )  <->  ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( K  e.  ZZ  /\  ( M  <_  K  /\  K  <_  N ) ) ) ) )
108, 9syl5bb 191 . . . 4  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( ( K  e.  ZZ  /\  M  <_  K  /\  K  <_  N
)  <->  ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( K  e.  ZZ  /\  ( M  <_  K  /\  K  <_  N ) ) ) ) )
117, 10bitrd 187 . . 3  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( K  e.  ( M ... N )  <-> 
( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( K  e.  ZZ  /\  ( M  <_  K  /\  K  <_  N ) ) ) ) )
125, 6, 11pm5.21nii 678 . 2  |-  ( K  e.  ( M ... N )  <->  ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( K  e.  ZZ  /\  ( M  <_  K  /\  K  <_  N ) ) ) )
131, 3, 123bitr4ri 212 1  |-  ( K  e.  ( M ... N )  <->  ( ( M  e.  ZZ  /\  N  e.  ZZ  /\  K  e.  ZZ )  /\  ( M  <_  K  /\  K  <_  N ) ) )
Colors of variables: wff set class
Syntax hints:    /\ wa 103    <-> wb 104    /\ w3a 947    e. wcel 1465   {crab 2397   class class class wbr 3899  (class class class)co 5742    <_ cle 7769   ZZcz 9022   ...cfz 9758
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 588  ax-in2 589  ax-io 683  ax-5 1408  ax-7 1409  ax-gen 1410  ax-ie1 1454  ax-ie2 1455  ax-8 1467  ax-10 1468  ax-11 1469  ax-i12 1470  ax-bndl 1471  ax-4 1472  ax-14 1477  ax-17 1491  ax-i9 1495  ax-ial 1499  ax-i5r 1500  ax-ext 2099  ax-sep 4016  ax-pow 4068  ax-pr 4101  ax-setind 4422  ax-cnex 7679  ax-resscn 7680
This theorem depends on definitions:  df-bi 116  df-3or 948  df-3an 949  df-tru 1319  df-fal 1322  df-nf 1422  df-sb 1721  df-eu 1980  df-mo 1981  df-clab 2104  df-cleq 2110  df-clel 2113  df-nfc 2247  df-ne 2286  df-ral 2398  df-rex 2399  df-rab 2402  df-v 2662  df-sbc 2883  df-dif 3043  df-un 3045  df-in 3047  df-ss 3054  df-pw 3482  df-sn 3503  df-pr 3504  df-op 3506  df-uni 3707  df-br 3900  df-opab 3960  df-id 4185  df-xp 4515  df-rel 4516  df-cnv 4517  df-co 4518  df-dm 4519  df-iota 5058  df-fun 5095  df-fv 5101  df-ov 5745  df-oprab 5746  df-mpo 5747  df-neg 7904  df-z 9023  df-fz 9759
This theorem is referenced by:  elfz4  9767  elfzuzb  9768  uzsubsubfz  9795  fzmmmeqm  9806  fzpreddisj  9819  elfz1b  9838  fzp1nel  9852  elfz0ubfz0  9870  elfz0fzfz0  9871  fz0fzelfz0  9872  fz0fzdiffz0  9875  elfzmlbp  9877  fzind2  9984  iseqf1olemqcl  10227  iseqf1olemnab  10229  iseqf1olemab  10230  seq3f1olemqsumkj  10239  seq3f1olemqsumk  10240  summodclem2a  11118  fsum3  11124  fsum3cvg3  11133  fsumcl2lem  11135  fsumadd  11143  fsummulc2  11185
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