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Theorem dvdsfac 12090
Description: A positive integer divides any greater factorial. (Contributed by Paul Chapman, 28-Nov-2012.)
Assertion
Ref Expression
dvdsfac  |-  ( ( K  e.  NN  /\  N  e.  ( ZZ>= `  K ) )  ->  K  ||  ( ! `  N ) )

Proof of Theorem dvdsfac
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fveq2 5570 . . . . 5  |-  ( x  =  K  ->  ( ! `  x )  =  ( ! `  K ) )
21breq2d 4055 . . . 4  |-  ( x  =  K  ->  ( K  ||  ( ! `  x )  <->  K  ||  ( ! `  K )
) )
32imbi2d 230 . . 3  |-  ( x  =  K  ->  (
( K  e.  NN  ->  K  ||  ( ! `
 x ) )  <-> 
( K  e.  NN  ->  K  ||  ( ! `
 K ) ) ) )
4 fveq2 5570 . . . . 5  |-  ( x  =  y  ->  ( ! `  x )  =  ( ! `  y ) )
54breq2d 4055 . . . 4  |-  ( x  =  y  ->  ( K  ||  ( ! `  x )  <->  K  ||  ( ! `  y )
) )
65imbi2d 230 . . 3  |-  ( x  =  y  ->  (
( K  e.  NN  ->  K  ||  ( ! `
 x ) )  <-> 
( K  e.  NN  ->  K  ||  ( ! `
 y ) ) ) )
7 fveq2 5570 . . . . 5  |-  ( x  =  ( y  +  1 )  ->  ( ! `  x )  =  ( ! `  ( y  +  1 ) ) )
87breq2d 4055 . . . 4  |-  ( x  =  ( y  +  1 )  ->  ( K  ||  ( ! `  x )  <->  K  ||  ( ! `  ( y  +  1 ) ) ) )
98imbi2d 230 . . 3  |-  ( x  =  ( y  +  1 )  ->  (
( K  e.  NN  ->  K  ||  ( ! `
 x ) )  <-> 
( K  e.  NN  ->  K  ||  ( ! `
 ( y  +  1 ) ) ) ) )
10 fveq2 5570 . . . . 5  |-  ( x  =  N  ->  ( ! `  x )  =  ( ! `  N ) )
1110breq2d 4055 . . . 4  |-  ( x  =  N  ->  ( K  ||  ( ! `  x )  <->  K  ||  ( ! `  N )
) )
1211imbi2d 230 . . 3  |-  ( x  =  N  ->  (
( K  e.  NN  ->  K  ||  ( ! `
 x ) )  <-> 
( K  e.  NN  ->  K  ||  ( ! `
 N ) ) ) )
13 nnm1nn0 9318 . . . . . . . 8  |-  ( K  e.  NN  ->  ( K  -  1 )  e.  NN0 )
14 faccl 10861 . . . . . . . 8  |-  ( ( K  -  1 )  e.  NN0  ->  ( ! `
 ( K  - 
1 ) )  e.  NN )
1513, 14syl 14 . . . . . . 7  |-  ( K  e.  NN  ->  ( ! `  ( K  -  1 ) )  e.  NN )
1615nnzd 9476 . . . . . 6  |-  ( K  e.  NN  ->  ( ! `  ( K  -  1 ) )  e.  ZZ )
17 nnz 9373 . . . . . 6  |-  ( K  e.  NN  ->  K  e.  ZZ )
18 dvdsmul2 12044 . . . . . 6  |-  ( ( ( ! `  ( K  -  1 ) )  e.  ZZ  /\  K  e.  ZZ )  ->  K  ||  ( ( ! `  ( K  -  1 ) )  x.  K ) )
1916, 17, 18syl2anc 411 . . . . 5  |-  ( K  e.  NN  ->  K  ||  ( ( ! `  ( K  -  1
) )  x.  K
) )
20 facnn2 10860 . . . . 5  |-  ( K  e.  NN  ->  ( ! `  K )  =  ( ( ! `
 ( K  - 
1 ) )  x.  K ) )
2119, 20breqtrrd 4071 . . . 4  |-  ( K  e.  NN  ->  K  ||  ( ! `  K
) )
2221a1i 9 . . 3  |-  ( K  e.  ZZ  ->  ( K  e.  NN  ->  K 
||  ( ! `  K ) ) )
2317adantl 277 . . . . . . 7  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  K  e.  ZZ )
24 elnnuz 9667 . . . . . . . . . . . 12  |-  ( K  e.  NN  <->  K  e.  ( ZZ>= `  1 )
)
25 uztrn 9647 . . . . . . . . . . . 12  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  ( ZZ>= `  1 )
)  ->  y  e.  ( ZZ>= `  1 )
)
2624, 25sylan2b 287 . . . . . . . . . . 11  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  y  e.  ( ZZ>= `  1 )
)
27 elnnuz 9667 . . . . . . . . . . 11  |-  ( y  e.  NN  <->  y  e.  ( ZZ>= `  1 )
)
2826, 27sylibr 134 . . . . . . . . . 10  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  y  e.  NN )
2928nnnn0d 9330 . . . . . . . . 9  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  y  e.  NN0 )
30 faccl 10861 . . . . . . . . 9  |-  ( y  e.  NN0  ->  ( ! `
 y )  e.  NN )
3129, 30syl 14 . . . . . . . 8  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  ( ! `  y )  e.  NN )
3231nnzd 9476 . . . . . . 7  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  ( ! `  y )  e.  ZZ )
3328nnzd 9476 . . . . . . . 8  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  y  e.  ZZ )
3433peano2zd 9480 . . . . . . 7  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  (
y  +  1 )  e.  ZZ )
35 dvdsmultr1 12061 . . . . . . 7  |-  ( ( K  e.  ZZ  /\  ( ! `  y )  e.  ZZ  /\  (
y  +  1 )  e.  ZZ )  -> 
( K  ||  ( ! `  y )  ->  K  ||  ( ( ! `  y )  x.  ( y  +  1 ) ) ) )
3623, 32, 34, 35syl3anc 1249 . . . . . 6  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  ( K  ||  ( ! `  y )  ->  K  ||  ( ( ! `  y )  x.  (
y  +  1 ) ) ) )
37 facp1 10856 . . . . . . . 8  |-  ( y  e.  NN0  ->  ( ! `
 ( y  +  1 ) )  =  ( ( ! `  y )  x.  (
y  +  1 ) ) )
3829, 37syl 14 . . . . . . 7  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  ( ! `  ( y  +  1 ) )  =  ( ( ! `
 y )  x.  ( y  +  1 ) ) )
3938breq2d 4055 . . . . . 6  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  ( K  ||  ( ! `  ( y  +  1 ) )  <->  K  ||  (
( ! `  y
)  x.  ( y  +  1 ) ) ) )
4036, 39sylibrd 169 . . . . 5  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  ( K  ||  ( ! `  y )  ->  K  ||  ( ! `  (
y  +  1 ) ) ) )
4140ex 115 . . . 4  |-  ( y  e.  ( ZZ>= `  K
)  ->  ( K  e.  NN  ->  ( K  ||  ( ! `  y
)  ->  K  ||  ( ! `  ( y  +  1 ) ) ) ) )
4241a2d 26 . . 3  |-  ( y  e.  ( ZZ>= `  K
)  ->  ( ( K  e.  NN  ->  K 
||  ( ! `  y ) )  -> 
( K  e.  NN  ->  K  ||  ( ! `
 ( y  +  1 ) ) ) ) )
433, 6, 9, 12, 22, 42uzind4 9691 . 2  |-  ( N  e.  ( ZZ>= `  K
)  ->  ( K  e.  NN  ->  K  ||  ( ! `  N )
) )
4443impcom 125 1  |-  ( ( K  e.  NN  /\  N  e.  ( ZZ>= `  K ) )  ->  K  ||  ( ! `  N ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1372    e. wcel 2175   class class class wbr 4043   ` cfv 5268  (class class class)co 5934   1c1 7908    + caddc 7910    x. cmul 7912    - cmin 8225   NNcn 9018   NN0cn0 9277   ZZcz 9354   ZZ>=cuz 9630   !cfa 10851    || cdvds 12017
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 615  ax-in2 616  ax-io 710  ax-5 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-10 1527  ax-11 1528  ax-i12 1529  ax-bndl 1531  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-13 2177  ax-14 2178  ax-ext 2186  ax-coll 4158  ax-sep 4161  ax-nul 4169  ax-pow 4217  ax-pr 4252  ax-un 4478  ax-setind 4583  ax-iinf 4634  ax-cnex 7998  ax-resscn 7999  ax-1cn 8000  ax-1re 8001  ax-icn 8002  ax-addcl 8003  ax-addrcl 8004  ax-mulcl 8005  ax-mulrcl 8006  ax-addcom 8007  ax-mulcom 8008  ax-addass 8009  ax-mulass 8010  ax-distr 8011  ax-i2m1 8012  ax-0lt1 8013  ax-1rid 8014  ax-0id 8015  ax-rnegex 8016  ax-cnre 8018  ax-pre-ltirr 8019  ax-pre-ltwlin 8020  ax-pre-lttrn 8021  ax-pre-ltadd 8023
This theorem depends on definitions:  df-bi 117  df-3or 981  df-3an 982  df-tru 1375  df-fal 1378  df-nf 1483  df-sb 1785  df-eu 2056  df-mo 2057  df-clab 2191  df-cleq 2197  df-clel 2200  df-nfc 2336  df-ne 2376  df-nel 2471  df-ral 2488  df-rex 2489  df-reu 2490  df-rab 2492  df-v 2773  df-sbc 2998  df-csb 3093  df-dif 3167  df-un 3169  df-in 3171  df-ss 3178  df-nul 3460  df-pw 3617  df-sn 3638  df-pr 3639  df-op 3641  df-uni 3850  df-int 3885  df-iun 3928  df-br 4044  df-opab 4105  df-mpt 4106  df-tr 4142  df-id 4338  df-iord 4411  df-on 4413  df-ilim 4414  df-suc 4416  df-iom 4637  df-xp 4679  df-rel 4680  df-cnv 4681  df-co 4682  df-dm 4683  df-rn 4684  df-res 4685  df-ima 4686  df-iota 5229  df-fun 5270  df-fn 5271  df-f 5272  df-f1 5273  df-fo 5274  df-f1o 5275  df-fv 5276  df-riota 5889  df-ov 5937  df-oprab 5938  df-mpo 5939  df-1st 6216  df-2nd 6217  df-recs 6381  df-frec 6467  df-pnf 8091  df-mnf 8092  df-xr 8093  df-ltxr 8094  df-le 8095  df-sub 8227  df-neg 8228  df-inn 9019  df-n0 9278  df-z 9355  df-uz 9631  df-seqfrec 10574  df-fac 10852  df-dvds 12018
This theorem is referenced by:  prmunb  12604
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