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Theorem bday0 28004
Description: Calculate the birthday of surreal zero. (Contributed by Scott Fenton, 7-Aug-2024.)
Assertion
Ref Expression
bday0 ( bday ‘ 0s ) = ∅

Proof of Theorem bday0
StepHypRef Expression
1 df-0s 28000 . . . 4 0s = (∅ |s ∅)
21fveq2i 6884 . . 3 ( bday ‘ 0s ) = ( bday ‘(∅ |s ∅))
3 0elpw 5326 . . . 4 ∅ ∈ 𝒫 No
4 nulsgts 27969 . . . 4 (∅ ∈ 𝒫 No → ∅ <<s ∅)
5 cutbday 27977 . . . 4 (∅ <<s ∅ → ( bday ‘(∅ |s ∅)) = ( bday “ {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}))
63, 4, 5mp2b 10 . . 3 ( bday ‘(∅ |s ∅)) = ( bday “ {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)})
72, 6eqtri 2786 . 2 ( bday ‘ 0s ) = ( bday “ {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)})
8 snelpwi 5425 . . . . . . . 8 (𝑥 No → {𝑥} ∈ 𝒫 No )
9 nulslts 27968 . . . . . . . . 9 ({𝑥} ∈ 𝒫 No → ∅ <<s {𝑥})
10 nulsgts 27969 . . . . . . . . 9 ({𝑥} ∈ 𝒫 No → {𝑥} <<s ∅)
119, 10jca 520 . . . . . . . 8 ({𝑥} ∈ 𝒫 No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
128, 11syl 18 . . . . . . 7 (𝑥 No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
1312rabeqc 3428 . . . . . 6 {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = No
14 bdaydm 27942 . . . . . 6 dom bday = No
1513, 14eqtr4i 2789 . . . . 5 {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = dom bday
1615imaeq2i 6060 . . . 4 ( bday “ {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = ( bday “ dom bday )
17 imadmrn 6072 . . . 4 ( bday “ dom bday ) = ran bday
18 bdayrn 27944 . . . 4 ran bday = On
1916, 17, 183eqtri 2790 . . 3 ( bday “ {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = On
2019inteqi 4916 . 2 ( bday “ {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = On
21 inton 6420 . 2 On = ∅
227, 20, 213eqtri 2790 1 ( bday ‘ 0s ) = ∅
Colors of variables: wff setvar class
Syntax hints:  wa 400   = wceq 1570  wcel 2143  {crab 3416  c0 4286  𝒫 cpw 4562  {csn 4589   cint 4912   class class class wbr 5109  dom cdm 5661  ran crn 5662  cima 5664  Oncon0 6360  cfv 6536  (class class class)co 7410   No csur 27804   bday cbday 27806   <<s cslts 27950   |s ccuts 27952   0s c0s 27998
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-rep 5238  ax-sep 5257  ax-nul 5269  ax-pow 5336  ax-pr 5404  ax-un 7732
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rmo 3369  df-reu 3370  df-rab 3417  df-v 3457  df-sbc 3745  df-csb 3854  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-pss 3925  df-nul 4287  df-if 4488  df-pw 4564  df-sn 4590  df-pr 4592  df-tp 4594  df-op 4596  df-uni 4873  df-int 4913  df-br 5110  df-opab 5174  df-mpt 5193  df-tr 5219  df-id 5556  df-eprel 5561  df-po 5569  df-so 5570  df-fr 5614  df-we 5616  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674  df-ord 6363  df-on 6364  df-suc 6366  df-iota 6492  df-fun 6538  df-fn 6539  df-f 6540  df-f1 6541  df-fo 6542  df-f1o 6543  df-fv 6544  df-riota 7367  df-ov 7413  df-oprab 7414  df-mpo 7415  df-1o 8449  df-2o 8450  df-no 27807  df-lts 27808  df-bday 27809  df-slts 27951  df-cuts 27953  df-0s 28000
This theorem is referenced by:  bday0b  28006  bday1  28007  cuteq0  28008  left0s  28086  right0s  28087  0elold  28103  addsproplem2  28163  negsproplem2  28222  negsproplem6  28226  mulsproplem2  28310  mulsproplem3  28311  mulsproplem4  28312  mulsproplem5  28313  mulsproplem6  28314  mulsproplem7  28315  mulsproplem8  28316  mulsproplem12  28320  mulsproplem13  28321  mulsproplem14  28322  n0bday  28545  bdayn0sf1o  28563  bdaypw2n0bndlem  28656  bdaypw2n0bnd  28657  bdayfinbndlem2  28661
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