Theorem elfz2 8881

Description: Membership in a finite set of sequential integers. We use the fact that an operation's value is empty outside of its domain to show M e. ZZ and N e. ZZ. (Contributed by NM, 6-Sep-2005.) (Revised by Mario Carneiro, 28-Apr-2015.)

Assertion

Ref	Expression
elfz2	|- ( K e. ( M ... N ) <-> ( ( M e. ZZ /\ N e. ZZ /\ K e. ZZ ) /\ ( M <_ K /\ K <_ N ) ) )

Proof of Theorem elfz2

Dummy variables x y z are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		anass 381	. 2 |- ( ( ( ( M e. ZZ /\ N e. ZZ ) /\ K e. ZZ ) /\ ( M <_ K /\ K <_ N ) ) <-> ( ( M e. ZZ /\ N e. ZZ ) /\ ( K e. ZZ /\ ( M <_ K /\ K <_ N ) ) ) )
2		df-3an 887	. . 3 |- ( ( M e. ZZ /\ N e. ZZ /\ K e. ZZ ) <-> ( ( M e. ZZ /\ N e. ZZ ) /\ K e. ZZ ) )
3	2	anbi1i 431	. 2 |- ( ( ( M e. ZZ /\ N e. ZZ /\ K e. ZZ ) /\ ( M <_ K /\ K <_ N ) ) <-> ( ( ( M e. ZZ /\ N e. ZZ ) /\ K e. ZZ ) /\ ( M <_ K /\ K <_ N ) ) )
4		df-fz 8875	. . . 4 |- ... = ( x e. ZZ , y e. ZZ |-> { z e. ZZ | ( x <_ z /\ z <_ y ) } )
5	4	elmpt2cl 5698	. . 3 |- ( K e. ( M ... N ) -> ( M e. ZZ /\ N e. ZZ ) )
6		simpl 102	. . 3 |- ( ( ( M e. ZZ /\ N e. ZZ ) /\ ( K e. ZZ /\ ( M <_ K /\ K <_ N ) ) ) -> ( M e. ZZ /\ N e. ZZ ) )
7		elfz1 8879	. . . 4 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( K e. ( M ... N ) <-> ( K e. ZZ /\ M <_ K /\ K <_ N ) ) )
8		3anass 889	. . . . 5 |- ( ( K e. ZZ /\ M <_ K /\ K <_ N ) <-> ( K e. ZZ /\ ( M <_ K /\ K <_ N ) ) )
9		ibar 285	. . . . 5 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( ( K e. ZZ /\ ( M <_ K /\ K <_ N ) ) <-> ( ( M e. ZZ /\ N e. ZZ ) /\ ( K e. ZZ /\ ( M <_ K /\ K <_ N ) ) ) ) )
10	8, 9	syl5bb 181	. . . 4 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( ( K e. ZZ /\ M <_ K /\ K <_ N ) <-> ( ( M e. ZZ /\ N e. ZZ ) /\ ( K e. ZZ /\ ( M <_ K /\ K <_ N ) ) ) ) )
11	7, 10	bitrd 177	. . 3 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( K e. ( M ... N ) <-> ( ( M e. ZZ /\ N e. ZZ ) /\ ( K e. ZZ /\ ( M <_ K /\ K <_ N ) ) ) ) )
12	5, 6, 11	pm5.21nii 620	. 2 |- ( K e. ( M ... N ) <-> ( ( M e. ZZ /\ N e. ZZ ) /\ ( K e. ZZ /\ ( M <_ K /\ K <_ N ) ) ) )
13	1, 3, 12	3bitr4ri 202	1 |- ( K e. ( M ... N ) <-> ( ( M e. ZZ /\ N e. ZZ /\ K e. ZZ ) /\ ( M <_ K /\ K <_ N ) ) )

Syntax hints:   /\ wa 97   <-> wb 98   /\ w3a 885   e. wcel 1393   {crab 2310   class class class wbr 3764  (class class class)co 5512   <_ cle 7061   ZZcz 8245   ...cfz 8874

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-14 1405  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-pow 3927  ax-pr 3944  ax-setind 4262  ax-cnex 6975  ax-resscn 6976

This theorem depends on definitions:  df-bi 110  df-3or 886  df-3an 887  df-tru 1246  df-fal 1249  df-nf 1350  df-sb 1646  df-eu 1903  df-mo 1904  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ne 2206  df-ral 2311  df-rex 2312  df-rab 2315  df-v 2559  df-sbc 2765  df-dif 2920  df-un 2922  df-in 2924  df-ss 2931  df-pw 3361  df-sn 3381  df-pr 3382  df-op 3384  df-uni 3581  df-br 3765  df-opab 3819  df-id 4030  df-xp 4351  df-rel 4352  df-cnv 4353  df-co 4354  df-dm 4355  df-iota 4867  df-fun 4904  df-fv 4910  df-ov 5515  df-oprab 5516  df-mpt2 5517  df-neg 7185  df-z 8246  df-fz 8875

This theorem is referenced by:  elfz4  8883  elfzuzb  8884  uzsubsubfz  8911  fzmmmeqm  8921  fzpreddisj  8933  elfz1b  8952  fzp1nel  8966  elfz0ubfz0  8982  elfz0fzfz0  8983  fz0fzelfz0  8984  fz0fzdiffz0  8987  elfzmlbmOLD  8989  elfzmlbp  8990  fzind2  9095