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Theorem bdaydm 27684
Description: The birthday function's domain is No . (Contributed by Scott Fenton, 14-Jun-2011.)
Assertion
Ref Expression
bdaydm dom bday = No

Proof of Theorem bdaydm
StepHypRef Expression
1 bdayfo 27587 . . 3 bday : No onto→On
2 fof 6736 . . 3 ( bday : No onto→On → bday : No ⟶On)
31, 2ax-mp 5 . 2 bday : No ⟶On
43fdmi 6663 1 dom bday = No
Colors of variables: wff setvar class
Syntax hints:   = wceq 1540  dom cdm 5619  Oncon0 6307  wf 6478  ontowfo 6480   No csur 27549   bday cbday 27551
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rab 3395  df-v 3438  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-br 5093  df-opab 5155  df-mpt 5174  df-id 5514  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-suc 6313  df-fun 6484  df-fn 6485  df-f 6486  df-fo 6488  df-1o 8388  df-no 27552  df-bday 27554
This theorem is referenced by:  nobdaymin  27687  nocvxminlem  27688  bday0s  27742  leftval  27773  rightval  27774  madebdayim  27802  lrold  27811  addsbdaylem  27928  negsbdaylem  27967  onscutlt  28170  onsiso  28174  bdayon  28178  bdayn0sf1o  28264
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