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Theorem 0fz1 9064
Description: Two ways to say a finite 1-based sequence is empty. (Contributed by Paul Chapman, 26-Oct-2012.)
Assertion
Ref Expression
0fz1  |-  ( ( N  e.  NN0  /\  F  Fn  ( 1 ... N ) )  ->  ( F  =  (/) 
<->  N  =  0 ) )

Proof of Theorem 0fz1
StepHypRef Expression
1 fn0 5038 . . . . 5  |-  ( F  Fn  (/)  <->  F  =  (/) )
2 fndmu 5020 . . . . 5  |-  ( ( F  Fn  ( 1 ... N )  /\  F  Fn  (/) )  -> 
( 1 ... N
)  =  (/) )
31, 2sylan2br 282 . . . 4  |-  ( ( F  Fn  ( 1 ... N )  /\  F  =  (/) )  -> 
( 1 ... N
)  =  (/) )
43ex 113 . . 3  |-  ( F  Fn  ( 1 ... N )  ->  ( F  =  (/)  ->  (
1 ... N )  =  (/) ) )
5 fneq2 5008 . . . . 5  |-  ( ( 1 ... N )  =  (/)  ->  ( F  Fn  ( 1 ... N )  <->  F  Fn  (/) ) )
65, 1syl6bb 194 . . . 4  |-  ( ( 1 ... N )  =  (/)  ->  ( F  Fn  ( 1 ... N )  <->  F  =  (/) ) )
76biimpcd 157 . . 3  |-  ( F  Fn  ( 1 ... N )  ->  (
( 1 ... N
)  =  (/)  ->  F  =  (/) ) )
84, 7impbid 127 . 2  |-  ( F  Fn  ( 1 ... N )  ->  ( F  =  (/)  <->  ( 1 ... N )  =  (/) ) )
9 fz1n 9063 . 2  |-  ( N  e.  NN0  ->  ( ( 1 ... N )  =  (/)  <->  N  =  0
) )
108, 9sylan9bbr 450 1  |-  ( ( N  e.  NN0  /\  F  Fn  ( 1 ... N ) )  ->  ( F  =  (/) 
<->  N  =  0 ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 102    <-> wb 103    = wceq 1284    e. wcel 1433   (/)c0 3251    Fn wfn 4917  (class class class)co 5532   0cc0 6981   1c1 6982   NN0cn0 8288   ...cfz 9029
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-in1 576  ax-in2 577  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-13 1444  ax-14 1445  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-sep 3896  ax-nul 3904  ax-pow 3948  ax-pr 3964  ax-un 4188  ax-setind 4280  ax-cnex 7067  ax-resscn 7068  ax-1cn 7069  ax-1re 7070  ax-icn 7071  ax-addcl 7072  ax-addrcl 7073  ax-mulcl 7074  ax-addcom 7076  ax-addass 7078  ax-distr 7080  ax-i2m1 7081  ax-0lt1 7082  ax-0id 7084  ax-rnegex 7085  ax-cnre 7087  ax-pre-ltirr 7088  ax-pre-ltwlin 7089  ax-pre-lttrn 7090  ax-pre-apti 7091  ax-pre-ltadd 7092
This theorem depends on definitions:  df-bi 115  df-3or 920  df-3an 921  df-tru 1287  df-fal 1290  df-nf 1390  df-sb 1686  df-eu 1944  df-mo 1945  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ne 2246  df-nel 2340  df-ral 2353  df-rex 2354  df-reu 2355  df-rab 2357  df-v 2603  df-sbc 2816  df-dif 2975  df-un 2977  df-in 2979  df-ss 2986  df-nul 3252  df-pw 3384  df-sn 3404  df-pr 3405  df-op 3407  df-uni 3602  df-int 3637  df-br 3786  df-opab 3840  df-mpt 3841  df-id 4048  df-xp 4369  df-rel 4370  df-cnv 4371  df-co 4372  df-dm 4373  df-rn 4374  df-res 4375  df-ima 4376  df-iota 4887  df-fun 4924  df-fn 4925  df-f 4926  df-fv 4930  df-riota 5488  df-ov 5535  df-oprab 5536  df-mpt2 5537  df-pnf 7155  df-mnf 7156  df-xr 7157  df-ltxr 7158  df-le 7159  df-sub 7281  df-neg 7282  df-inn 8040  df-n0 8289  df-z 8352  df-uz 8620  df-fz 9030
This theorem is referenced by: (None)
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