Theorem elharval 8468

Description: The Hartogs number of a set is greater than all ordinals which inject into it. (Contributed by Stefan O'Rear, 11-Feb-2015.) (Revised by Mario Carneiro, 15-May-2015.)

Assertion

Ref	Expression
elharval	|- ( Y e. (har ` X ) <-> ( Y e. On /\ Y ~<_ X ) )

Proof of Theorem elharval

Dummy variable y is distinct from all other variables.

Step	Hyp	Ref	Expression
1		elfvex 6221	. 2 |- ( Y e. (har ` X ) -> X e. _V )
2		reldom 7961	. . . 4 |- Rel ~<_
3	2	brrelex2i 5159	. . 3 |- ( Y ~<_ X -> X e. _V )
4	3	adantl 482	. 2 |- ( ( Y e. On /\ Y ~<_ X ) -> X e. _V )
5		harval 8467	. . . 4 |- ( X e. _V -> (har ` X ) = { y e. On | y ~<_ X } )
6	5	eleq2d 2687	. . 3 |- ( X e. _V -> ( Y e. (har ` X ) <-> Y e. { y e. On | y ~<_ X } ) )
7		breq1 4656	. . . 4 |- ( y = Y -> ( y ~<_ X <-> Y ~<_ X ) )
8	7	elrab 3363	. . 3 |- ( Y e. { y e. On | y ~<_ X } <-> ( Y e. On /\ Y ~<_ X ) )
9	6, 8	syl6bb 276	. 2 |- ( X e. _V -> ( Y e. (har ` X ) <-> ( Y e. On /\ Y ~<_ X ) ) )
10	1, 4, 9	pm5.21nii 368	1 |- ( Y e. (har ` X ) <-> ( Y e. On /\ Y ~<_ X ) )

Syntax hints:   <-> wb 196   /\ wa 384   e. wcel 1990   {crab 2916   _Vcvv 3200   class class class wbr 4653   Oncon0 5723   ` cfv 5888   ~<_ cdom 7953  harchar 8461

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-se 5074  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-isom 5897  df-riota 6611  df-wrecs 7407  df-recs 7468  df-en 7956  df-dom 7957  df-oi 8415  df-har 8463

This theorem is referenced by:  harndom  8469  harcard  8804  cardprclem  8805  cardaleph  8912  dfac12lem2  8966  hsmexlem1  9248  pwcfsdom  9405  pwfseqlem5  9485  hargch  9495  harinf  37601  harn0  37672