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Theorem uzin2 12936
Description: The upper integers are closed under intersection. (Contributed by Mario Carneiro, 24-Dec-2013.)
Assertion
Ref Expression
uzin2  |-  ( ( A  e.  ran  ZZ>=  /\  B  e.  ran  ZZ>= )  -> 
( A  i^i  B
)  e.  ran  ZZ>= )

Proof of Theorem uzin2
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 uzf 10967 . . . 4  |-  ZZ>= : ZZ --> ~P ZZ
2 ffn 5659 . . . 4  |-  ( ZZ>= : ZZ --> ~P ZZ  ->  ZZ>=  Fn  ZZ )
31, 2ax-mp 5 . . 3  |-  ZZ>=  Fn  ZZ
4 fvelrnb 5840 . . 3  |-  ( ZZ>=  Fn  ZZ  ->  ( A  e.  ran  ZZ>= 
<->  E. x  e.  ZZ  ( ZZ>= `  x )  =  A ) )
53, 4ax-mp 5 . 2  |-  ( A  e.  ran  ZZ>=  <->  E. x  e.  ZZ  ( ZZ>= `  x
)  =  A )
6 fvelrnb 5840 . . 3  |-  ( ZZ>=  Fn  ZZ  ->  ( B  e.  ran  ZZ>= 
<->  E. y  e.  ZZ  ( ZZ>= `  y )  =  B ) )
73, 6ax-mp 5 . 2  |-  ( B  e.  ran  ZZ>=  <->  E. y  e.  ZZ  ( ZZ>= `  y
)  =  B )
8 ineq1 3645 . . 3  |-  ( (
ZZ>= `  x )  =  A  ->  ( ( ZZ>=
`  x )  i^i  ( ZZ>= `  y )
)  =  ( A  i^i  ( ZZ>= `  y
) ) )
98eleq1d 2520 . 2  |-  ( (
ZZ>= `  x )  =  A  ->  ( (
( ZZ>= `  x )  i^i  ( ZZ>= `  y )
)  e.  ran  ZZ>=  <->  ( A  i^i  ( ZZ>= `  y )
)  e.  ran  ZZ>= ) )
10 ineq2 3646 . . 3  |-  ( (
ZZ>= `  y )  =  B  ->  ( A  i^i  ( ZZ>= `  y )
)  =  ( A  i^i  B ) )
1110eleq1d 2520 . 2  |-  ( (
ZZ>= `  y )  =  B  ->  ( ( A  i^i  ( ZZ>= `  y
) )  e.  ran  ZZ>=  <->  ( A  i^i  B )  e. 
ran  ZZ>= ) )
12 uzin 10996 . . 3  |-  ( ( x  e.  ZZ  /\  y  e.  ZZ )  ->  ( ( ZZ>= `  x
)  i^i  ( ZZ>= `  y ) )  =  ( ZZ>= `  if (
x  <_  y , 
y ,  x ) ) )
13 ifcl 3931 . . . . 5  |-  ( ( y  e.  ZZ  /\  x  e.  ZZ )  ->  if ( x  <_ 
y ,  y ,  x )  e.  ZZ )
1413ancoms 453 . . . 4  |-  ( ( x  e.  ZZ  /\  y  e.  ZZ )  ->  if ( x  <_ 
y ,  y ,  x )  e.  ZZ )
15 fnfvelrn 5941 . . . 4  |-  ( (
ZZ>=  Fn  ZZ  /\  if ( x  <_  y ,  y ,  x )  e.  ZZ )  -> 
( ZZ>= `  if (
x  <_  y , 
y ,  x ) )  e.  ran  ZZ>= )
163, 14, 15sylancr 663 . . 3  |-  ( ( x  e.  ZZ  /\  y  e.  ZZ )  ->  ( ZZ>= `  if (
x  <_  y , 
y ,  x ) )  e.  ran  ZZ>= )
1712, 16eqeltrd 2539 . 2  |-  ( ( x  e.  ZZ  /\  y  e.  ZZ )  ->  ( ( ZZ>= `  x
)  i^i  ( ZZ>= `  y ) )  e. 
ran  ZZ>= )
185, 7, 9, 11, 172gencl 3101 1  |-  ( ( A  e.  ran  ZZ>=  /\  B  e.  ran  ZZ>= )  -> 
( A  i^i  B
)  e.  ran  ZZ>= )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 184    /\ wa 369    = wceq 1370    e. wcel 1758   E.wrex 2796    i^i cin 3427   ifcif 3891   ~Pcpw 3960   class class class wbr 4392   ran crn 4941    Fn wfn 5513   -->wf 5514   ` cfv 5518    <_ cle 9522   ZZcz 10749   ZZ>=cuz 10964
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1592  ax-4 1603  ax-5 1671  ax-6 1710  ax-7 1730  ax-8 1760  ax-9 1762  ax-10 1777  ax-11 1782  ax-12 1794  ax-13 1952  ax-ext 2430  ax-sep 4513  ax-nul 4521  ax-pow 4570  ax-pr 4631  ax-un 6474  ax-cnex 9441  ax-resscn 9442  ax-pre-lttri 9459  ax-pre-lttrn 9460
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3or 966  df-3an 967  df-tru 1373  df-ex 1588  df-nf 1591  df-sb 1703  df-eu 2264  df-mo 2265  df-clab 2437  df-cleq 2443  df-clel 2446  df-nfc 2601  df-ne 2646  df-nel 2647  df-ral 2800  df-rex 2801  df-rab 2804  df-v 3072  df-sbc 3287  df-csb 3389  df-dif 3431  df-un 3433  df-in 3435  df-ss 3442  df-nul 3738  df-if 3892  df-pw 3962  df-sn 3978  df-pr 3980  df-op 3984  df-uni 4192  df-br 4393  df-opab 4451  df-mpt 4452  df-id 4736  df-po 4741  df-so 4742  df-xp 4946  df-rel 4947  df-cnv 4948  df-co 4949  df-dm 4950  df-rn 4951  df-res 4952  df-ima 4953  df-iota 5481  df-fun 5520  df-fn 5521  df-f 5522  df-f1 5523  df-fo 5524  df-f1o 5525  df-fv 5526  df-ov 6195  df-er 7203  df-en 7413  df-dom 7414  df-sdom 7415  df-pnf 9523  df-mnf 9524  df-xr 9525  df-ltxr 9526  df-le 9527  df-neg 9701  df-z 10750  df-uz 10965
This theorem is referenced by:  rexanuz  12937  zfbas  19587  heibor1lem  28848
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