Theorem bday0s 34022

Description: Calculate the birthday of surreal zero. (Contributed by Scott Fenton, 7-Aug-2024.)

Assertion

Ref	Expression
bday0s	⊢ ( bday ‘ 0s ) = ∅

Proof of Theorem bday0s

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-0s 34018	. . . 4 ⊢ 0s = (∅ |s ∅)
2	1	fveq2i 6777	. . 3 ⊢ ( bday ‘ 0s ) = ( bday ‘(∅ |s ∅))
3		0elpw 5278	. . . 4 ⊢ ∅ ∈ 𝒫 No
4		nulssgt 33992	. . . 4 ⊢ (∅ ∈ 𝒫 No → ∅ <<s ∅)
5		scutbday 33998	. . . 4 ⊢ (∅ <<s ∅ → ( bday ‘(∅ |s ∅)) = ∩ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}))
6	3, 4, 5	mp2b 10	. . 3 ⊢ ( bday ‘(∅ |s ∅)) = ∩ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)})
7	2, 6	eqtri 2766	. 2 ⊢ ( bday ‘ 0s ) = ∩ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)})
8		snelpwi 5360	. . . . . . . 8 ⊢ (𝑥 ∈ No → {𝑥} ∈ 𝒫 No )
9		nulsslt 33991	. . . . . . . . 9 ⊢ ({𝑥} ∈ 𝒫 No → ∅ <<s {𝑥})
10		nulssgt 33992	. . . . . . . . 9 ⊢ ({𝑥} ∈ 𝒫 No → {𝑥} <<s ∅)
11	9, 10	jca 512	. . . . . . . 8 ⊢ ({𝑥} ∈ 𝒫 No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
12	8, 11	syl 17	. . . . . . 7 ⊢ (𝑥 ∈ No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
13	12	rabeqc 3622	. . . . . 6 ⊢ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = No
14		bdaydm 33969	. . . . . 6 ⊢ dom bday = No
15	13, 14	eqtr4i 2769	. . . . 5 ⊢ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = dom bday
16	15	imaeq2i 5967	. . . 4 ⊢ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = ( bday “ dom bday )
17		imadmrn 5979	. . . 4 ⊢ ( bday “ dom bday ) = ran bday
18		bdayrn 33970	. . . 4 ⊢ ran bday = On
19	16, 17, 18	3eqtri 2770	. . 3 ⊢ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = On
20	19	inteqi 4883	. 2 ⊢ ∩ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = ∩ On
21		inton 6323	. 2 ⊢ ∩ On = ∅
22	7, 20, 21	3eqtri 2770	1 ⊢ ( bday ‘ 0s ) = ∅

Syntax hints:   ∧ wa 396   = wceq 1539   ∈ wcel 2106  {crab 3068  ∅c0 4256  𝒫 cpw 4533  {csn 4561  ∩ cint 4879   class class class wbr 5074  dom cdm 5589  ran crn 5590   “ cima 5592  Oncon0 6266  ‘cfv 6433  (class class class)co 7275   No csur 33843   bday cbday 33845   <<s csslt 33975   |s cscut 33977   0s c0s 34016

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-rep 5209  ax-sep 5223  ax-nul 5230  ax-pr 5352  ax-un 7588

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-ral 3069  df-rex 3070  df-rmo 3071  df-reu 3072  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-pss 3906  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-tp 4566  df-op 4568  df-uni 4840  df-int 4880  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-tr 5192  df-id 5489  df-eprel 5495  df-po 5503  df-so 5504  df-fr 5544  df-we 5546  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-ord 6269  df-on 6270  df-suc 6272  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441  df-riota 7232  df-ov 7278  df-oprab 7279  df-mpo 7280  df-1o 8297  df-2o 8298  df-no 33846  df-slt 33847  df-bday 33848  df-sslt 33976  df-scut 33978  df-0s 34018

This theorem is referenced by:  bday0b  34024  bday1s  34025  left0s  34075  right0s  34076