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Theorem nofnbday 28009
Description: A surreal is a function over its birthday. (Contributed by Scott Fenton, 16-Jun-2011.)
Assertion
Ref Expression
nofnbday (𝐴 ∈ No → 𝐴 Fn (bday‘𝐴))

Proof of Theorem nofnbday
StepHypRef Expression
1 nofun 28006 . 2 (𝐴 ∈ No → Fun 𝐴)
2 bdayval 28005 . . 3 (𝐴 ∈ No → (bday‘𝐴) = dom 𝐴)
32eqcomd 2766 . 2 (𝐴 ∈ No → dom 𝐴 = (bday‘𝐴))
4 df-fn 6541 . 2 (𝐴 Fn (bday‘𝐴) ↔ (Fun 𝐴 ∧ dom 𝐴 = (bday‘𝐴)))
51, 3, 4sylanbrc 595 1 (𝐴 ∈ No → 𝐴 Fn (bday‘𝐴))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1569   ∈ wcel 2144  dom cdm 5650  Fun wfun 6532   Fn wfn 6533  ‘cfv 6538  Nocsur 27997  bdaycbday 27999
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-sep 5248  ax-pow 5326  ax-pr 5390  ax-un 7751
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4584  df-pr 4586  df-op 4590  df-uni 4867  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-fv 6546  df-no 28000  df-bday 28002
This theorem is used by:  nodenselem8  28048
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