ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  fzass4 Unicode version
Theorem fzass4 10296
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 527 . . . . 5 |- ( ( ( B e. ( ZZ>= ` A ) /\ D e. ( ZZ>= ` B ) ) /\ ( C e. ( ZZ>= ` B ) /\ D e. ( ZZ>= ` C ) ) ) -> B e. ( ZZ>= ` A ) )
2 simprl 531 . . . . 5 |- ( ( ( B e. ( ZZ>= ` A ) /\ D e. ( ZZ>= ` B ) ) /\ ( C e. ( ZZ>= ` B ) /\ D e. ( ZZ>= ` C ) ) ) -> C e. ( ZZ>= ` B ) )
31, 2jca 306 . . . 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 9772 . . . . . 6 |- ( ( C e. ( ZZ>= ` B ) /\ B e. ( ZZ>= ` A ) ) -> C e. ( ZZ>= ` A ) )
54ancoms 268 . . . . 5 |- ( ( B e. ( ZZ>= ` A ) /\ C e. ( ZZ>= ` B ) ) -> C e. ( ZZ>= ` A ) )
65ad2ant2r 509 . . . 4 |- ( ( ( B e. ( ZZ>= ` A ) /\ D e. ( ZZ>= ` B ) ) /\ ( C e. ( ZZ>= ` B ) /\ D e. ( ZZ>= ` C ) ) ) -> C e. ( ZZ>= ` A ) )
7 simprr 533 . . . 4 |- ( ( ( B e. ( ZZ>= ` A ) /\ D e. ( ZZ>= ` B ) ) /\ ( C e. ( ZZ>= ` B ) /\ D e. ( ZZ>= ` C ) ) ) -> D e. ( ZZ>= ` C ) )
83, 6, 7jca32 310 . . 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 527 . . . . 5 |- ( ( ( B e. ( ZZ>= ` A ) /\ C e. ( ZZ>= ` B ) ) /\ ( C e. ( ZZ>= ` A ) /\ D e. ( ZZ>= ` C ) ) ) -> B e. ( ZZ>= ` A ) )
10 uztrn 9772 . . . . . . 7 |- ( ( D e. ( ZZ>= ` C ) /\ C e. ( ZZ>= ` B ) ) -> D e. ( ZZ>= ` B ) )
1110ancoms 268 . . . . . 6 |- ( ( C e. ( ZZ>= ` B ) /\ D e. ( ZZ>= ` C ) ) -> D e. ( ZZ>= ` B ) )
1211ad2ant2l 508 . . . . 5 |- ( ( ( B e. ( ZZ>= ` A ) /\ C e. ( ZZ>= ` B ) ) /\ ( C e. ( ZZ>= ` A ) /\ D e. ( ZZ>= ` C ) ) ) -> D e. ( ZZ>= ` B ) )
139, 12jca 306 . . . 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 529 . . . 4 |- ( ( ( B e. ( ZZ>= ` A ) /\ C e. ( ZZ>= ` B ) ) /\ ( C e. ( ZZ>= ` A ) /\ D e. ( ZZ>= ` C ) ) ) -> C e. ( ZZ>= ` B ) )
15 simprr 533 . . . 4 |- ( ( ( B e. ( ZZ>= ` A ) /\ C e. ( ZZ>= ` B ) ) /\ ( C e. ( ZZ>= ` A ) /\ D e. ( ZZ>= ` C ) ) ) -> D e. ( ZZ>= ` C ) )
1613, 14, 15jca32 310 . . 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 126 . 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 10253 . . 3 |- ( B e. ( A ... D ) <-> ( B e. ( ZZ>= ` A ) /\ D e. ( ZZ>= ` B ) ) )
19 elfzuzb 10253 . . 3 |- ( C e. ( B ... D ) <-> ( C e. ( ZZ>= ` B ) /\ D e. ( ZZ>= ` C ) ) )
2018, 19anbi12i 460 . 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 10253 . . 3 |- ( B e. ( A ... C ) <-> ( B e. ( ZZ>= ` A ) /\ C e. ( ZZ>= ` B ) ) )
22 elfzuzb 10253 . . 3 |- ( C e. ( A ... D ) <-> ( C e. ( ZZ>= ` A ) /\ D e. ( ZZ>= ` C ) ) )
2321, 22anbi12i 460 . 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 212 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:   /\ wa 104   <-> wb 105   e. wcel 2202   ` cfv 5326  (class class class)co 6017   ZZ>=cuz 9754   ...cfz 10242
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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-pre-ltwlin 8144
This theorem depends on definitions:  df-bi 117  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-fv 5334  df-ov 6020  df-oprab 6021  df-mpo 6022  df-pnf 8215  df-mnf 8216  df-xr 8217  df-ltxr 8218  df-le 8219  df-neg 8352  df-z 9479  df-uz 9755  df-fz 10243
This theorem is referenced by:  ccatswrd  11250  ccatpfx  11281
  Copyright terms: Public domain W3C validator