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Theorem cardnum 8917
Description: Two ways to express the class of all cardinal numbers, which consists of the finite ordinals in  om plus the transfinite alephs. (Contributed by NM, 10-Sep-2004.)
Assertion
Ref Expression
cardnum  |-  { x  |  ( card `  x
)  =  x }  =  ( om  u.  ran  aleph )

Proof of Theorem cardnum
StepHypRef Expression
1 iscard3 8916 . . . 4  |-  ( (
card `  x )  =  x  <->  x  e.  ( om  u.  ran  aleph ) )
21bicomi 214 . . 3  |-  ( x  e.  ( om  u.  ran  aleph )  <->  ( card `  x )  =  x )
32abbi2i 2738 . 2  |-  ( om  u.  ran  aleph )  =  { x  |  (
card `  x )  =  x }
43eqcomi 2631 1  |-  { x  |  ( card `  x
)  =  x }  =  ( om  u.  ran  aleph )
Colors of variables: wff setvar class
Syntax hints:    = wceq 1483    e. wcel 1990   {cab 2608    u. cun 3572   ran crn 5115   ` cfv 5888   omcom 7065   cardccrd 8761   alephcale 8762
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  ax-inf2 8538
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-int 4476  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-om 7066  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-oi 8415  df-har 8463  df-card 8765  df-aleph 8766
This theorem is referenced by:  alephprc  8922
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