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Theorem dvdsfac 11820
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 5496 . . . . 5  |-  ( x  =  K  ->  ( ! `  x )  =  ( ! `  K ) )
21breq2d 4001 . . . 4  |-  ( x  =  K  ->  ( K  ||  ( ! `  x )  <->  K  ||  ( ! `  K )
) )
32imbi2d 229 . . 3  |-  ( x  =  K  ->  (
( K  e.  NN  ->  K  ||  ( ! `
 x ) )  <-> 
( K  e.  NN  ->  K  ||  ( ! `
 K ) ) ) )
4 fveq2 5496 . . . . 5  |-  ( x  =  y  ->  ( ! `  x )  =  ( ! `  y ) )
54breq2d 4001 . . . 4  |-  ( x  =  y  ->  ( K  ||  ( ! `  x )  <->  K  ||  ( ! `  y )
) )
65imbi2d 229 . . 3  |-  ( x  =  y  ->  (
( K  e.  NN  ->  K  ||  ( ! `
 x ) )  <-> 
( K  e.  NN  ->  K  ||  ( ! `
 y ) ) ) )
7 fveq2 5496 . . . . 5  |-  ( x  =  ( y  +  1 )  ->  ( ! `  x )  =  ( ! `  ( y  +  1 ) ) )
87breq2d 4001 . . . 4  |-  ( x  =  ( y  +  1 )  ->  ( K  ||  ( ! `  x )  <->  K  ||  ( ! `  ( y  +  1 ) ) ) )
98imbi2d 229 . . 3  |-  ( x  =  ( y  +  1 )  ->  (
( K  e.  NN  ->  K  ||  ( ! `
 x ) )  <-> 
( K  e.  NN  ->  K  ||  ( ! `
 ( y  +  1 ) ) ) ) )
10 fveq2 5496 . . . . 5  |-  ( x  =  N  ->  ( ! `  x )  =  ( ! `  N ) )
1110breq2d 4001 . . . 4  |-  ( x  =  N  ->  ( K  ||  ( ! `  x )  <->  K  ||  ( ! `  N )
) )
1211imbi2d 229 . . 3  |-  ( x  =  N  ->  (
( K  e.  NN  ->  K  ||  ( ! `
 x ) )  <-> 
( K  e.  NN  ->  K  ||  ( ! `
 N ) ) ) )
13 nnm1nn0 9176 . . . . . . . 8  |-  ( K  e.  NN  ->  ( K  -  1 )  e.  NN0 )
14 faccl 10669 . . . . . . . 8  |-  ( ( K  -  1 )  e.  NN0  ->  ( ! `
 ( K  - 
1 ) )  e.  NN )
1513, 14syl 14 . . . . . . 7  |-  ( K  e.  NN  ->  ( ! `  ( K  -  1 ) )  e.  NN )
1615nnzd 9333 . . . . . 6  |-  ( K  e.  NN  ->  ( ! `  ( K  -  1 ) )  e.  ZZ )
17 nnz 9231 . . . . . 6  |-  ( K  e.  NN  ->  K  e.  ZZ )
18 dvdsmul2 11776 . . . . . 6  |-  ( ( ( ! `  ( K  -  1 ) )  e.  ZZ  /\  K  e.  ZZ )  ->  K  ||  ( ( ! `  ( K  -  1 ) )  x.  K ) )
1916, 17, 18syl2anc 409 . . . . 5  |-  ( K  e.  NN  ->  K  ||  ( ( ! `  ( K  -  1
) )  x.  K
) )
20 facnn2 10668 . . . . 5  |-  ( K  e.  NN  ->  ( ! `  K )  =  ( ( ! `
 ( K  - 
1 ) )  x.  K ) )
2119, 20breqtrrd 4017 . . . 4  |-  ( K  e.  NN  ->  K  ||  ( ! `  K
) )
2221a1i 9 . . 3  |-  ( K  e.  ZZ  ->  ( K  e.  NN  ->  K 
||  ( ! `  K ) ) )
2317adantl 275 . . . . . . 7  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  K  e.  ZZ )
24 elnnuz 9523 . . . . . . . . . . . 12  |-  ( K  e.  NN  <->  K  e.  ( ZZ>= `  1 )
)
25 uztrn 9503 . . . . . . . . . . . 12  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  ( ZZ>= `  1 )
)  ->  y  e.  ( ZZ>= `  1 )
)
2624, 25sylan2b 285 . . . . . . . . . . 11  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  y  e.  ( ZZ>= `  1 )
)
27 elnnuz 9523 . . . . . . . . . . 11  |-  ( y  e.  NN  <->  y  e.  ( ZZ>= `  1 )
)
2826, 27sylibr 133 . . . . . . . . . 10  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  y  e.  NN )
2928nnnn0d 9188 . . . . . . . . 9  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  y  e.  NN0 )
30 faccl 10669 . . . . . . . . 9  |-  ( y  e.  NN0  ->  ( ! `
 y )  e.  NN )
3129, 30syl 14 . . . . . . . 8  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  ( ! `  y )  e.  NN )
3231nnzd 9333 . . . . . . 7  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  ( ! `  y )  e.  ZZ )
3328nnzd 9333 . . . . . . . 8  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  y  e.  ZZ )
3433peano2zd 9337 . . . . . . 7  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  (
y  +  1 )  e.  ZZ )
35 dvdsmultr1 11793 . . . . . . 7  |-  ( ( K  e.  ZZ  /\  ( ! `  y )  e.  ZZ  /\  (
y  +  1 )  e.  ZZ )  -> 
( K  ||  ( ! `  y )  ->  K  ||  ( ( ! `  y )  x.  ( y  +  1 ) ) ) )
3623, 32, 34, 35syl3anc 1233 . . . . . 6  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  ( K  ||  ( ! `  y )  ->  K  ||  ( ( ! `  y )  x.  (
y  +  1 ) ) ) )
37 facp1 10664 . . . . . . . 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 4001 . . . . . 6  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  ( K  ||  ( ! `  ( y  +  1 ) )  <->  K  ||  (
( ! `  y
)  x.  ( y  +  1 ) ) ) )
4036, 39sylibrd 168 . . . . 5  |-  ( ( y  e.  ( ZZ>= `  K )  /\  K  e.  NN )  ->  ( K  ||  ( ! `  y )  ->  K  ||  ( ! `  (
y  +  1 ) ) ) )
4140ex 114 . . . 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 9547 . 2  |-  ( N  e.  ( ZZ>= `  K
)  ->  ( K  e.  NN  ->  K  ||  ( ! `  N )
) )
4443impcom 124 1  |-  ( ( K  e.  NN  /\  N  e.  ( ZZ>= `  K ) )  ->  K  ||  ( ! `  N ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    = wceq 1348    e. wcel 2141   class class class wbr 3989   ` cfv 5198  (class class class)co 5853   1c1 7775    + caddc 7777    x. cmul 7779    - cmin 8090   NNcn 8878   NN0cn0 9135   ZZcz 9212   ZZ>=cuz 9487   !cfa 10659    || cdvds 11749
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 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-coll 4104  ax-sep 4107  ax-nul 4115  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-iinf 4572  ax-cnex 7865  ax-resscn 7866  ax-1cn 7867  ax-1re 7868  ax-icn 7869  ax-addcl 7870  ax-addrcl 7871  ax-mulcl 7872  ax-mulrcl 7873  ax-addcom 7874  ax-mulcom 7875  ax-addass 7876  ax-mulass 7877  ax-distr 7878  ax-i2m1 7879  ax-0lt1 7880  ax-1rid 7881  ax-0id 7882  ax-rnegex 7883  ax-cnre 7885  ax-pre-ltirr 7886  ax-pre-ltwlin 7887  ax-pre-lttrn 7888  ax-pre-ltadd 7890
This theorem depends on definitions:  df-bi 116  df-3or 974  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-nel 2436  df-ral 2453  df-rex 2454  df-reu 2455  df-rab 2457  df-v 2732  df-sbc 2956  df-csb 3050  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-int 3832  df-iun 3875  df-br 3990  df-opab 4051  df-mpt 4052  df-tr 4088  df-id 4278  df-iord 4351  df-on 4353  df-ilim 4354  df-suc 4356  df-iom 4575  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-f 5202  df-f1 5203  df-fo 5204  df-f1o 5205  df-fv 5206  df-riota 5809  df-ov 5856  df-oprab 5857  df-mpo 5858  df-1st 6119  df-2nd 6120  df-recs 6284  df-frec 6370  df-pnf 7956  df-mnf 7957  df-xr 7958  df-ltxr 7959  df-le 7960  df-sub 8092  df-neg 8093  df-inn 8879  df-n0 9136  df-z 9213  df-uz 9488  df-seqfrec 10402  df-fac 10660  df-dvds 11750
This theorem is referenced by:  prmunb  12314
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