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Theorem inffz 17097
Description: The infimum of a finite sequence of integers. (Contributed by Scott Fenton, 8-Aug-2013.) (Revised by Jim Kingdon, 15-Oct-2022.)
Assertion
Ref Expression
inffz  |-  ( N  e.  ( ZZ>= `  M
)  -> inf ( ( M ... N ) ,  ZZ ,  <  )  =  M )

Proof of Theorem inffz
Dummy variables  x  y  z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 simprl 535 . . . 4  |-  ( ( N  e.  ( ZZ>= `  M )  /\  (
x  e.  ZZ  /\  y  e.  ZZ )
)  ->  x  e.  ZZ )
21zred 9751 . . 3  |-  ( ( N  e.  ( ZZ>= `  M )  /\  (
x  e.  ZZ  /\  y  e.  ZZ )
)  ->  x  e.  RR )
3 simprr 537 . . . 4  |-  ( ( N  e.  ( ZZ>= `  M )  /\  (
x  e.  ZZ  /\  y  e.  ZZ )
)  ->  y  e.  ZZ )
43zred 9751 . . 3  |-  ( ( N  e.  ( ZZ>= `  M )  /\  (
x  e.  ZZ  /\  y  e.  ZZ )
)  ->  y  e.  RR )
52, 4lttri3d 8434 . 2  |-  ( ( N  e.  ( ZZ>= `  M )  /\  (
x  e.  ZZ  /\  y  e.  ZZ )
)  ->  ( x  =  y  <->  ( -.  x  <  y  /\  -.  y  <  x ) ) )
6 eluzel2 9909 . 2  |-  ( N  e.  ( ZZ>= `  M
)  ->  M  e.  ZZ )
7 eluzfz1 10418 . 2  |-  ( N  e.  ( ZZ>= `  M
)  ->  M  e.  ( M ... N ) )
8 elfzle1 10414 . . . 4  |-  ( z  e.  ( M ... N )  ->  M  <_  z )
98adantl 277 . . 3  |-  ( ( N  e.  ( ZZ>= `  M )  /\  z  e.  ( M ... N
) )  ->  M  <_  z )
106zred 9751 . . . 4  |-  ( N  e.  ( ZZ>= `  M
)  ->  M  e.  RR )
11 elfzelz 10411 . . . . 5  |-  ( z  e.  ( M ... N )  ->  z  e.  ZZ )
1211zred 9751 . . . 4  |-  ( z  e.  ( M ... N )  ->  z  e.  RR )
13 lenlt 8395 . . . 4  |-  ( ( M  e.  RR  /\  z  e.  RR )  ->  ( M  <_  z  <->  -.  z  <  M ) )
1410, 12, 13syl2an 289 . . 3  |-  ( ( N  e.  ( ZZ>= `  M )  /\  z  e.  ( M ... N
) )  ->  ( M  <_  z  <->  -.  z  <  M ) )
159, 14mpbid 147 . 2  |-  ( ( N  e.  ( ZZ>= `  M )  /\  z  e.  ( M ... N
) )  ->  -.  z  <  M )
165, 6, 7, 15infminti 7361 1  |-  ( N  e.  ( ZZ>= `  M
)  -> inf ( ( M ... N ) ,  ZZ ,  <  )  =  M )
Colors of variables:    wff set class
This proof depends on syntax axioms:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    = wceq 1402    e. wcel 2209   class class class wbr 4128   ` cfv 5375  (class class class)co 6079  infcinf 7317   RRcr 8172    < clt 8354    <_ cle 8355   ZZcz 9627   ZZ>=cuz 9904   ...cfz 10394
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4247  ax-pow 4309  ax-pr 4344  ax-un 4576  ax-setind 4682  ax-cnex 8264  ax-resscn 8265  ax-pre-ltirr 8285  ax-pre-apti 8288
This proof depends on definitions:  df-bi 117  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-br 4129  df-opab 4191  df-mpt 4192  df-id 4436  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-ima 4785  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-fv 5383  df-riota 6032  df-ov 6082  df-oprab 6083  df-mpo 6084  df-sup 7318  df-inf 7319  df-pnf 8356  df-mnf 8357  df-xr 8358  df-ltxr 8359  df-le 8360  df-neg 8494  df-z 9628  df-uz 9905  df-fz 10395
This theorem is used by: (None)
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