Theorem 0cnALT 8336

Description: Alternate proof of 0cn 8138. (Contributed by NM, 19-Feb-2005.) (Revised by Mario Carneiro, 27-May-2016.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
0cnALT	|- 0 e. CC

Proof of Theorem 0cnALT

Step	Hyp	Ref	Expression
1		ax-icn 8094	. . 3 |- _i e. CC
2		cnegex 8324	. . 3 |- ( _i e. CC -> E. x e. CC ( _i + x ) = 0 )
3	1, 2	ax-mp 5	. 2 |- E. x e. CC ( _i + x ) = 0
4		addcl 8124	. . . . 5 |- ( ( _i e. CC /\ x e. CC ) -> ( _i + x ) e. CC )
5	1, 4	mpan 424	. . . 4 |- ( x e. CC -> ( _i + x ) e. CC )
6		eleq1 2292	. . . 4 |- ( ( _i + x ) = 0 -> ( ( _i + x ) e. CC <-> 0 e. CC ) )
7	5, 6	syl5ibcom 155	. . 3 |- ( x e. CC -> ( ( _i + x ) = 0 -> 0 e. CC ) )
8	7	rexlimiv 2642	. 2 |- ( E. x e. CC ( _i + x ) = 0 -> 0 e. CC )
9	3, 8	ax-mp 5	1 |- 0 e. CC

Syntax hints:   = wceq 1395   e. wcel 2200   E.wrex 2509  (class class class)co 6001   CCcc 7997   0cc0 7999   _ici 8001   + caddc 8002

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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211  ax-resscn 8091  ax-1cn 8092  ax-icn 8094  ax-addcl 8095  ax-addrcl 8096  ax-mulcl 8097  ax-addcom 8099  ax-addass 8101  ax-distr 8103  ax-i2m1 8104  ax-0id 8107  ax-rnegex 8108  ax-cnre 8110

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2801  df-un 3201  df-in 3203  df-ss 3210  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-br 4084  df-iota 5278  df-fv 5326  df-ov 6004

This theorem is referenced by: (None)