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Theorem fzass4 10829
Description: Two ways to express a nondecreasing sequence of four integers. (Contributed by Stefan O'Rear, 15-Aug-2015.)
Assertion
Ref Expression
fzass4  |-  ( ( B  e.  ( A ... D )  /\  C  e.  ( B ... D ) )  <->  ( B  e.  ( A ... C
)  /\  C  e.  ( A ... D ) ) )

Proof of Theorem fzass4
StepHypRef Expression
1 simpll 730 . . . . 5  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  D  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  B )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  B  e.  (
ZZ>= `  A ) )
2 simprl 732 . . . . 5  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  D  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  B )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  C  e.  (
ZZ>= `  B ) )
31, 2jca 518 . . . 4  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  D  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  B )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  ( B  e.  ( ZZ>= `  A )  /\  C  e.  ( ZZ>=
`  B ) ) )
4 uztrn 10244 . . . . . 6  |-  ( ( C  e.  ( ZZ>= `  B )  /\  B  e.  ( ZZ>= `  A )
)  ->  C  e.  ( ZZ>= `  A )
)
54ancoms 439 . . . . 5  |-  ( ( B  e.  ( ZZ>= `  A )  /\  C  e.  ( ZZ>= `  B )
)  ->  C  e.  ( ZZ>= `  A )
)
65ad2ant2r 727 . . . 4  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  D  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  B )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  C  e.  (
ZZ>= `  A ) )
7 simprr 733 . . . 4  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  D  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  B )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  D  e.  (
ZZ>= `  C ) )
83, 6, 7jca32 521 . . 3  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  D  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  B )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  ( ( B  e.  ( ZZ>= `  A
)  /\  C  e.  ( ZZ>= `  B )
)  /\  ( C  e.  ( ZZ>= `  A )  /\  D  e.  ( ZZ>=
`  C ) ) ) )
9 simpll 730 . . . . 5  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  C  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  A )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  B  e.  (
ZZ>= `  A ) )
10 uztrn 10244 . . . . . . 7  |-  ( ( D  e.  ( ZZ>= `  C )  /\  C  e.  ( ZZ>= `  B )
)  ->  D  e.  ( ZZ>= `  B )
)
1110ancoms 439 . . . . . 6  |-  ( ( C  e.  ( ZZ>= `  B )  /\  D  e.  ( ZZ>= `  C )
)  ->  D  e.  ( ZZ>= `  B )
)
1211ad2ant2l 726 . . . . 5  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  C  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  A )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  D  e.  (
ZZ>= `  B ) )
139, 12jca 518 . . . 4  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  C  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  A )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  ( B  e.  ( ZZ>= `  A )  /\  D  e.  ( ZZ>=
`  B ) ) )
14 simplr 731 . . . 4  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  C  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  A )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  C  e.  (
ZZ>= `  B ) )
15 simprr 733 . . . 4  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  C  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  A )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  D  e.  (
ZZ>= `  C ) )
1613, 14, 15jca32 521 . . 3  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  C  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  A )  /\  D  e.  ( ZZ>= `  C ) ) )  ->  ( ( B  e.  ( ZZ>= `  A
)  /\  D  e.  ( ZZ>= `  B )
)  /\  ( C  e.  ( ZZ>= `  B )  /\  D  e.  ( ZZ>=
`  C ) ) ) )
178, 16impbii 180 . 2  |-  ( ( ( B  e.  (
ZZ>= `  A )  /\  D  e.  ( ZZ>= `  B ) )  /\  ( C  e.  ( ZZ>=
`  B )  /\  D  e.  ( ZZ>= `  C ) ) )  <-> 
( ( B  e.  ( ZZ>= `  A )  /\  C  e.  ( ZZ>=
`  B ) )  /\  ( C  e.  ( ZZ>= `  A )  /\  D  e.  ( ZZ>=
`  C ) ) ) )
18 elfzuzb 10792 . . 3  |-  ( B  e.  ( A ... D )  <->  ( B  e.  ( ZZ>= `  A )  /\  D  e.  ( ZZ>=
`  B ) ) )
19 elfzuzb 10792 . . 3  |-  ( C  e.  ( B ... D )  <->  ( C  e.  ( ZZ>= `  B )  /\  D  e.  ( ZZ>=
`  C ) ) )
2018, 19anbi12i 678 . 2  |-  ( ( B  e.  ( A ... D )  /\  C  e.  ( B ... D ) )  <->  ( ( B  e.  ( ZZ>= `  A )  /\  D  e.  ( ZZ>= `  B )
)  /\  ( C  e.  ( ZZ>= `  B )  /\  D  e.  ( ZZ>=
`  C ) ) ) )
21 elfzuzb 10792 . . 3  |-  ( B  e.  ( A ... C )  <->  ( B  e.  ( ZZ>= `  A )  /\  C  e.  ( ZZ>=
`  B ) ) )
22 elfzuzb 10792 . . 3  |-  ( C  e.  ( A ... D )  <->  ( C  e.  ( ZZ>= `  A )  /\  D  e.  ( ZZ>=
`  C ) ) )
2321, 22anbi12i 678 . 2  |-  ( ( B  e.  ( A ... C )  /\  C  e.  ( A ... D ) )  <->  ( ( B  e.  ( ZZ>= `  A )  /\  C  e.  ( ZZ>= `  B )
)  /\  ( C  e.  ( ZZ>= `  A )  /\  D  e.  ( ZZ>=
`  C ) ) ) )
2417, 20, 233bitr4i 268 1  |-  ( ( B  e.  ( A ... D )  /\  C  e.  ( B ... D ) )  <->  ( B  e.  ( A ... C
)  /\  C  e.  ( A ... D ) ) )
Colors of variables: wff set class
Syntax hints:    <-> wb 176    /\ wa 358    e. wcel 1684   ` cfv 5255  (class class class)co 5858   ZZ>=cuz 10230   ...cfz 10782
This theorem is referenced by:  ccatswrd  11459  splfv1  11470
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512  ax-cnex 8793  ax-resscn 8794  ax-pre-lttri 8811  ax-pre-lttrn 8812
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-nel 2449  df-ral 2548  df-rex 2549  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-op 3649  df-uni 3828  df-iun 3907  df-br 4024  df-opab 4078  df-mpt 4079  df-id 4309  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-ov 5861  df-oprab 5862  df-mpt2 5863  df-1st 6122  df-2nd 6123  df-er 6660  df-en 6864  df-dom 6865  df-sdom 6866  df-pnf 8869  df-mnf 8870  df-xr 8871  df-ltxr 8872  df-le 8873  df-neg 9040  df-z 10025  df-uz 10231  df-fz 10783
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