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Theorem bday0 28190
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 28186 . . . 4 0s = (∅ |s ∅)
21fveq2i 6886 . . 3 ( bday ‘ 0s ) = ( bday ‘(∅ |s ∅))
3 0elpw 5317 . . . 4 ∅ ∈ 𝒫 No
4 nulsgts 28155 . . . 4 (∅ ∈ 𝒫 No → ∅ <<s ∅)
5 cutbday 28163 . . . 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 2784 . 2 ( bday ‘ 0s ) = ∩ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)})
8 snelpwi 5412 . . . . . . . 8 (𝑥 ∈ No → {𝑥} ∈ 𝒫 No )
9 nulslts 28154 . . . . . . . . 9 ({𝑥} ∈ 𝒫 No → ∅ <<s {𝑥})
10 nulsgts 28155 . . . . . . . . 9 ({𝑥} ∈ 𝒫 No → {𝑥} <<s ∅)
119, 10jca 521 . . . . . . . 8 ({𝑥} ∈ 𝒫 No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
128, 11syl 18 . . . . . . 7 (𝑥 ∈ No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
1312rabeqc 3425 . . . . . 6 {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = No
14 bdaydm 28128 . . . . . 6 dom bday = No
1513, 14eqtr4i 2787 . . . . 5 {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = dom bday
1615imaeq2i 6050 . . . 4 ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = ( bday “ dom bday )
17 imadmrn 6067 . . . 4 ( bday “ dom bday ) = ran bday
18 bdayrn 28130 . . . 4 ran bday = On
1916, 17, 183eqtri 2788 . . 3 ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = On
2019inteqi 4911 . 2 ∩ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = ∩ On
21 inton 6421 . 2 ∩ On = ∅
227, 20, 213eqtri 2788 1 ( bday ‘ 0s ) = ∅
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ∧ wa 401   = wceq 1570   ∈ wcel 2145  {crab 3413  ∅c0 4279  𝒫 cpw 4557  {csn 4584  ∩ cint 4907   class class class wbr 5103  dom cdm 5651  ran crn 5652   “ cima 5654  Oncon0 6361  ‘cfv 6537  (class class class)co 7418   No csur 27990   bday cbday 27992   <<s cslts 28136   |s ccuts 28138   0s c0s 28184
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 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-rep 5232  ax-sep 5249  ax-nul 5260  ax-pow 5327  ax-pr 5391  ax-un 7749
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-rmo 3366  df-reu 3367  df-rab 3414  df-v 3453  df-sbc 3740  df-csb 3848  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-pss 3919  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-tp 4589  df-op 4591  df-uni 4868  df-int 4908  df-br 5104  df-opab 5168  df-mpt 5187  df-tr 5213  df-id 5546  df-eprel 5551  df-po 5559  df-so 5560  df-fr 5604  df-we 5606  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-ord 6364  df-on 6365  df-suc 6367  df-iota 6493  df-fun 6539  df-fn 6540  df-f 6541  df-f1 6542  df-fo 6543  df-f1o 6544  df-fv 6545  df-riota 7375  df-ov 7421  df-oprab 7422  df-mpo 7423  df-1o 8469  df-2o 8470  df-no 27993  df-lts 27994  df-bday 27995  df-slts 28137  df-cuts 28139  df-0s 28186
This theorem is used by:  bday0b  28192  bday1  28193  cuteq0  28194  left0s  28272  right0s  28273  0elold  28289  addsproplem2  28349  negsproplem2  28408  negsproplem6  28412  mulsproplem2  28496  mulsproplem3  28497  mulsproplem4  28498  mulsproplem5  28499  mulsproplem6  28500  mulsproplem7  28501  mulsproplem8  28502  mulsproplem12  28506  mulsproplem13  28507  mulsproplem14  28508  n0bday  28731  bdayn0sf1o  28749  bdaypw2n0bndlem  28842  bdaypw2n0bnd  28843  bdayfinbndlem2  28847
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