Theorem rexuz2 9814

Description: Restricted existential quantification in an upper set of integers. (Contributed by NM, 9-Sep-2005.)

Assertion

Ref	Expression
rexuz2	|- ( E. n e. ( ZZ>= ` M ) ph <-> ( M e. ZZ /\ E. n e. ZZ ( M <_ n /\ ph ) ) )

Distinct variable group:   n, M

Allowed substitution hint:   ph( n)

Proof of Theorem rexuz2

Step	Hyp	Ref	Expression
1		eluz2 9760	. . . . . 6 |- ( n e. ( ZZ>= ` M ) <-> ( M e. ZZ /\ n e. ZZ /\ M <_ n ) )
2		df-3an 1006	. . . . . 6 |- ( ( M e. ZZ /\ n e. ZZ /\ M <_ n ) <-> ( ( M e. ZZ /\ n e. ZZ ) /\ M <_ n ) )
3	1, 2	bitri 184	. . . . 5 |- ( n e. ( ZZ>= ` M ) <-> ( ( M e. ZZ /\ n e. ZZ ) /\ M <_ n ) )
4	3	anbi1i 458	. . . 4 |- ( ( n e. ( ZZ>= ` M ) /\ ph ) <-> ( ( ( M e. ZZ /\ n e. ZZ ) /\ M <_ n ) /\ ph ) )
5		anass 401	. . . . 5 |- ( ( ( ( M e. ZZ /\ n e. ZZ ) /\ M <_ n ) /\ ph ) <-> ( ( M e. ZZ /\ n e. ZZ ) /\ ( M <_ n /\ ph ) ) )
6		anass 401	. . . . . 6 |- ( ( ( M e. ZZ /\ n e. ZZ ) /\ ( M <_ n /\ ph ) ) <-> ( M e. ZZ /\ ( n e. ZZ /\ ( M <_ n /\ ph ) ) ) )
7		an12 563	. . . . . 6 |- ( ( M e. ZZ /\ ( n e. ZZ /\ ( M <_ n /\ ph ) ) ) <-> ( n e. ZZ /\ ( M e. ZZ /\ ( M <_ n /\ ph ) ) ) )
8	6, 7	bitri 184	. . . . 5 |- ( ( ( M e. ZZ /\ n e. ZZ ) /\ ( M <_ n /\ ph ) ) <-> ( n e. ZZ /\ ( M e. ZZ /\ ( M <_ n /\ ph ) ) ) )
9	5, 8	bitri 184	. . . 4 |- ( ( ( ( M e. ZZ /\ n e. ZZ ) /\ M <_ n ) /\ ph ) <-> ( n e. ZZ /\ ( M e. ZZ /\ ( M <_ n /\ ph ) ) ) )
10	4, 9	bitri 184	. . 3 |- ( ( n e. ( ZZ>= ` M ) /\ ph ) <-> ( n e. ZZ /\ ( M e. ZZ /\ ( M <_ n /\ ph ) ) ) )
11	10	rexbii2 2543	. 2 |- ( E. n e. ( ZZ>= ` M ) ph <-> E. n e. ZZ ( M e. ZZ /\ ( M <_ n /\ ph ) ) )
12		r19.42v 2690	. 2 |- ( E. n e. ZZ ( M e. ZZ /\ ( M <_ n /\ ph ) ) <-> ( M e. ZZ /\ E. n e. ZZ ( M <_ n /\ ph ) ) )
13	11, 12	bitri 184	1 |- ( E. n e. ( ZZ>= ` M ) ph <-> ( M e. ZZ /\ E. n e. ZZ ( M <_ n /\ ph ) ) )

Syntax hints:   /\ wa 104   <-> wb 105   /\ w3a 1004   e. wcel 2202   E.wrex 2511   class class class wbr 4088   ` cfv 5326   <_ cle 8214   ZZcz 9478   ZZ>=cuz 9754

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-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-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-cnex 8122  ax-resscn 8123

This theorem depends on definitions:  df-bi 117  df-3or 1005  df-3an 1006  df-tru 1400  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-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-sbc 3032  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-neg 8352  df-z 9479  df-uz 9755

This theorem is referenced by:  2rexuz  9815