Theorem rexuz2 9737

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 9689	. . . . . 6 |- ( n e. ( ZZ>= ` M ) <-> ( M e. ZZ /\ n e. ZZ /\ M <_ n ) )
2		df-3an 983	. . . . . 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 561	. . . . . 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 2519	. 2 |- ( E. n e. ( ZZ>= ` M ) ph <-> E. n e. ZZ ( M e. ZZ /\ ( M <_ n /\ ph ) ) )
12		r19.42v 2665	. 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 981   e. wcel 2178   E.wrex 2487   class class class wbr 4059   ` cfv 5290   <_ cle 8143   ZZcz 9407   ZZ>=cuz 9683

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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269  ax-cnex 8051  ax-resscn 8052

This theorem depends on definitions:  df-bi 117  df-3or 982  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ral 2491  df-rex 2492  df-rab 2495  df-v 2778  df-sbc 3006  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-br 4060  df-opab 4122  df-mpt 4123  df-id 4358  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-rn 4704  df-res 4705  df-ima 4706  df-iota 5251  df-fun 5292  df-fn 5293  df-f 5294  df-fv 5298  df-ov 5970  df-neg 8281  df-z 9408  df-uz 9684

This theorem is referenced by:  2rexuz  9738