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Theorem bday0s 27873
Description: Calculate the birthday of surreal zero. (Contributed by Scott Fenton, 7-Aug-2024.)
Assertion
Ref Expression
bday0s ( bday ‘ 0s ) = ∅

Proof of Theorem bday0s
StepHypRef Expression
1 df-0s 27869 . . . 4 0s = (∅ |s ∅)
21fveq2i 6909 . . 3 ( bday ‘ 0s ) = ( bday ‘(∅ |s ∅))
3 0elpw 5356 . . . 4 ∅ ∈ 𝒫 No
4 nulssgt 27843 . . . 4 (∅ ∈ 𝒫 No → ∅ <<s ∅)
5 scutbday 27849 . . . 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 2765 . 2 ( bday ‘ 0s ) = ( bday “ {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)})
8 snelpwi 5448 . . . . . . . 8 (𝑥 No → {𝑥} ∈ 𝒫 No )
9 nulsslt 27842 . . . . . . . . 9 ({𝑥} ∈ 𝒫 No → ∅ <<s {𝑥})
10 nulssgt 27843 . . . . . . . . 9 ({𝑥} ∈ 𝒫 No → {𝑥} <<s ∅)
119, 10jca 511 . . . . . . . 8 ({𝑥} ∈ 𝒫 No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
128, 11syl 17 . . . . . . 7 (𝑥 No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
1312rabeqc 3449 . . . . . 6 {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = No
14 bdaydm 27819 . . . . . 6 dom bday = No
1513, 14eqtr4i 2768 . . . . 5 {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = dom bday
1615imaeq2i 6076 . . . 4 ( bday “ {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = ( bday “ dom bday )
17 imadmrn 6088 . . . 4 ( bday “ dom bday ) = ran bday
18 bdayrn 27820 . . . 4 ran bday = On
1916, 17, 183eqtri 2769 . . 3 ( bday “ {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = On
2019inteqi 4950 . 2 ( bday “ {𝑥 No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = On
21 inton 6442 . 2 On = ∅
227, 20, 213eqtri 2769 1 ( bday ‘ 0s ) = ∅
Colors of variables: wff setvar class
Syntax hints:  wa 395   = wceq 1540  wcel 2108  {crab 3436  c0 4333  𝒫 cpw 4600  {csn 4626   cint 4946   class class class wbr 5143  dom cdm 5685  ran crn 5686  cima 5688  Oncon0 6384  cfv 6561  (class class class)co 7431   No csur 27684   bday cbday 27686   <<s csslt 27825   |s cscut 27827   0s c0s 27867
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 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2708  ax-rep 5279  ax-sep 5296  ax-nul 5306  ax-pow 5365  ax-pr 5432  ax-un 7755
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2065  df-mo 2540  df-eu 2569  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2892  df-ne 2941  df-ral 3062  df-rex 3071  df-rmo 3380  df-reu 3381  df-rab 3437  df-v 3482  df-sbc 3789  df-csb 3900  df-dif 3954  df-un 3956  df-in 3958  df-ss 3968  df-pss 3971  df-nul 4334  df-if 4526  df-pw 4602  df-sn 4627  df-pr 4629  df-tp 4631  df-op 4633  df-uni 4908  df-int 4947  df-br 5144  df-opab 5206  df-mpt 5226  df-tr 5260  df-id 5578  df-eprel 5584  df-po 5592  df-so 5593  df-fr 5637  df-we 5639  df-xp 5691  df-rel 5692  df-cnv 5693  df-co 5694  df-dm 5695  df-rn 5696  df-res 5697  df-ima 5698  df-ord 6387  df-on 6388  df-suc 6390  df-iota 6514  df-fun 6563  df-fn 6564  df-f 6565  df-f1 6566  df-fo 6567  df-f1o 6568  df-fv 6569  df-riota 7388  df-ov 7434  df-oprab 7435  df-mpo 7436  df-1o 8506  df-2o 8507  df-no 27687  df-slt 27688  df-bday 27689  df-sslt 27826  df-scut 27828  df-0s 27869
This theorem is referenced by:  bday0b  27875  bday1s  27876  cuteq0  27877  left0s  27931  right0s  27932  0elold  27947  addsproplem2  28003  negsproplem2  28061  negsproplem6  28065  mulsproplem2  28143  mulsproplem3  28144  mulsproplem4  28145  mulsproplem5  28146  mulsproplem6  28147  mulsproplem7  28148  mulsproplem8  28149  mulsproplem12  28153  mulsproplem13  28154  mulsproplem14  28155  n0sbday  28354  pw2bday  28418
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