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Theorem alephord2 7703
Description: Ordering property of the aleph function. Theorem 8A(a) of [Enderton] p. 213 and its converse. (Contributed by NM, 3-Nov-2003.) (Revised by Mario Carneiro, 9-Feb-2013.)
Assertion
Ref Expression
alephord2  |-  ( ( A  e.  On  /\  B  e.  On )  ->  ( A  e.  B  <->  (
aleph `  A )  e.  ( aleph `  B )
) )

Proof of Theorem alephord2
StepHypRef Expression
1 alephord 7702 . 2  |-  ( ( A  e.  On  /\  B  e.  On )  ->  ( A  e.  B  <->  (
aleph `  A )  ~< 
( aleph `  B )
) )
2 alephon 7696 . . . 4  |-  ( aleph `  A )  e.  On
3 alephon 7696 . . . . 5  |-  ( aleph `  B )  e.  On
4 onenon 7582 . . . . 5  |-  ( (
aleph `  B )  e.  On  ->  ( aleph `  B )  e.  dom  card )
53, 4ax-mp 8 . . . 4  |-  ( aleph `  B )  e.  dom  card
6 cardsdomel 7607 . . . 4  |-  ( ( ( aleph `  A )  e.  On  /\  ( aleph `  B )  e.  dom  card )  ->  ( ( aleph `  A )  ~< 
( aleph `  B )  <->  (
aleph `  A )  e.  ( card `  ( aleph `  B ) ) ) )
72, 5, 6mp2an 653 . . 3  |-  ( (
aleph `  A )  ~< 
( aleph `  B )  <->  (
aleph `  A )  e.  ( card `  ( aleph `  B ) ) )
8 alephcard 7697 . . . 4  |-  ( card `  ( aleph `  B )
)  =  ( aleph `  B )
98eleq2i 2347 . . 3  |-  ( (
aleph `  A )  e.  ( card `  ( aleph `  B ) )  <-> 
( aleph `  A )  e.  ( aleph `  B )
)
107, 9bitri 240 . 2  |-  ( (
aleph `  A )  ~< 
( aleph `  B )  <->  (
aleph `  A )  e.  ( aleph `  B )
)
111, 10syl6bb 252 1  |-  ( ( A  e.  On  /\  B  e.  On )  ->  ( A  e.  B  <->  (
aleph `  A )  e.  ( aleph `  B )
) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    /\ wa 358    e. wcel 1684   class class class wbr 4023   Oncon0 4392   dom cdm 4689   ` cfv 5255    ~< csdm 6862   cardccrd 7568   alephcale 7569
This theorem is referenced by:  alephord2i  7704  alephord3  7705  alephiso  7725  alephval3  7737
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-rep 4131  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512  ax-inf2 7342
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-ral 2548  df-rex 2549  df-reu 2550  df-rmo 2551  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-pss 3168  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-tp 3648  df-op 3649  df-uni 3828  df-int 3863  df-iun 3907  df-br 4024  df-opab 4078  df-mpt 4079  df-tr 4114  df-eprel 4305  df-id 4309  df-po 4314  df-so 4315  df-fr 4352  df-se 4353  df-we 4354  df-ord 4395  df-on 4396  df-lim 4397  df-suc 4398  df-om 4657  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-isom 5264  df-riota 6304  df-recs 6388  df-rdg 6423  df-er 6660  df-en 6864  df-dom 6865  df-sdom 6866  df-fin 6867  df-oi 7225  df-har 7272  df-card 7572  df-aleph 7573
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