Theorem rexuz2 9540

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 9493	. . . . . 6 |- ( n e. ( ZZ>= ` M ) <-> ( M e. ZZ /\ n e. ZZ /\ M <_ n ) )
2		df-3an 975	. . . . . 6 |- ( ( M e. ZZ /\ n e. ZZ /\ M <_ n ) <-> ( ( M e. ZZ /\ n e. ZZ ) /\ M <_ n ) )
3	1, 2	bitri 183	. . . . 5 |- ( n e. ( ZZ>= ` M ) <-> ( ( M e. ZZ /\ n e. ZZ ) /\ M <_ n ) )
4	3	anbi1i 455	. . . 4 |- ( ( n e. ( ZZ>= ` M ) /\ ph ) <-> ( ( ( M e. ZZ /\ n e. ZZ ) /\ M <_ n ) /\ ph ) )
5		anass 399	. . . . 5 |- ( ( ( ( M e. ZZ /\ n e. ZZ ) /\ M <_ n ) /\ ph ) <-> ( ( M e. ZZ /\ n e. ZZ ) /\ ( M <_ n /\ ph ) ) )
6		anass 399	. . . . . 6 |- ( ( ( M e. ZZ /\ n e. ZZ ) /\ ( M <_ n /\ ph ) ) <-> ( M e. ZZ /\ ( n e. ZZ /\ ( M <_ n /\ ph ) ) ) )
7		an12 556	. . . . . 6 |- ( ( M e. ZZ /\ ( n e. ZZ /\ ( M <_ n /\ ph ) ) ) <-> ( n e. ZZ /\ ( M e. ZZ /\ ( M <_ n /\ ph ) ) ) )
8	6, 7	bitri 183	. . . . 5 |- ( ( ( M e. ZZ /\ n e. ZZ ) /\ ( M <_ n /\ ph ) ) <-> ( n e. ZZ /\ ( M e. ZZ /\ ( M <_ n /\ ph ) ) ) )
9	5, 8	bitri 183	. . . 4 |- ( ( ( ( M e. ZZ /\ n e. ZZ ) /\ M <_ n ) /\ ph ) <-> ( n e. ZZ /\ ( M e. ZZ /\ ( M <_ n /\ ph ) ) ) )
10	4, 9	bitri 183	. . 3 |- ( ( n e. ( ZZ>= ` M ) /\ ph ) <-> ( n e. ZZ /\ ( M e. ZZ /\ ( M <_ n /\ ph ) ) ) )
11	10	rexbii2 2481	. 2 |- ( E. n e. ( ZZ>= ` M ) ph <-> E. n e. ZZ ( M e. ZZ /\ ( M <_ n /\ ph ) ) )
12		r19.42v 2627	. 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 183	1 |- ( E. n e. ( ZZ>= ` M ) ph <-> ( M e. ZZ /\ E. n e. ZZ ( M <_ n /\ ph ) ) )

Syntax hints:   /\ wa 103   <-> wb 104   /\ w3a 973   e. wcel 2141   E.wrex 2449   class class class wbr 3989   ` cfv 5198   <_ cle 7955   ZZcz 9212   ZZ>=cuz 9487

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-pow 4160  ax-pr 4194  ax-cnex 7865  ax-resscn 7866

This theorem depends on definitions:  df-bi 116  df-3or 974  df-3an 975  df-tru 1351  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ral 2453  df-rex 2454  df-rab 2457  df-v 2732  df-sbc 2956  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-br 3990  df-opab 4051  df-mpt 4052  df-id 4278  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-f 5202  df-fv 5206  df-ov 5856  df-neg 8093  df-z 9213  df-uz 9488

This theorem is referenced by:  2rexuz  9541