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Theorem nofnbday 28036
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 28033 . 2 (𝐴 ∈ No → Fun 𝐴)
2 bdayval 28032 . . 3 (𝐴 ∈ No → (bday‘𝐴) = dom 𝐴)
32eqcomd 2769 . 2 (𝐴 ∈ No → dom 𝐴 = (bday‘𝐴))
4 df-fn 6558 . 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 1570   ∈ wcel 2147  dom cdm 5655  Fun wfun 6549   Fn wfn 6550  ‘cfv 6555  Nocsur 28024  bdaycbday 28026
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-sep 5252  ax-pow 5331  ax-pr 5395  ax-un 7772
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-mpt 5190  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-iota 6509  df-fun 6557  df-fn 6558  df-f 6559  df-fv 6563  df-no 28027  df-bday 28029
This theorem is used by:  nodenselem8  28075
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