Theorem bday0s 33949

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 33945	. . . 4 ⊢ 0s = (∅ |s ∅)
2	1	fveq2i 6759	. . 3 ⊢ ( bday ‘ 0s ) = ( bday ‘(∅ |s ∅))
3		0elpw 5273	. . . 4 ⊢ ∅ ∈ 𝒫 No
4		nulssgt 33919	. . . 4 ⊢ (∅ ∈ 𝒫 No → ∅ <<s ∅)
5		scutbday 33925	. . . 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 5354	. . . . . . . 8 ⊢ (𝑥 ∈ No → {𝑥} ∈ 𝒫 No )
9		nulsslt 33918	. . . . . . . . 9 ⊢ ({𝑥} ∈ 𝒫 No → ∅ <<s {𝑥})
10		nulssgt 33919	. . . . . . . . 9 ⊢ ({𝑥} ∈ 𝒫 No → {𝑥} <<s ∅)
11	9, 10	jca 511	. . . . . . . 8 ⊢ ({𝑥} ∈ 𝒫 No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
12	8, 11	syl 17	. . . . . . 7 ⊢ (𝑥 ∈ No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
13	12	rabeqc 3615	. . . . . 6 ⊢ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = No
14		bdaydm 33896	. . . . . 6 ⊢ dom bday = No
15	13, 14	eqtr4i 2769	. . . . 5 ⊢ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = dom bday
16	15	imaeq2i 5956	. . . 4 ⊢ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = ( bday “ dom bday )
17		imadmrn 5968	. . . 4 ⊢ ( bday “ dom bday ) = ran bday
18		bdayrn 33897	. . . 4 ⊢ ran bday = On
19	16, 17, 18	3eqtri 2770	. . 3 ⊢ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = On
20	19	inteqi 4880	. 2 ⊢ ∩ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = ∩ On
21		inton 6308	. 2 ⊢ ∩ On = ∅
22	7, 20, 21	3eqtri 2770	1 ⊢ ( bday ‘ 0s ) = ∅

Syntax hints:   ∧ wa 395   = wceq 1539   ∈ wcel 2108  {crab 3067  ∅c0 4253  𝒫 cpw 4530  {csn 4558  ∩ cint 4876   class class class wbr 5070  dom cdm 5580  ran crn 5581   “ cima 5583  Oncon0 6251  ‘cfv 6418  (class class class)co 7255   No csur 33770   bday cbday 33772   <<s csslt 33902   |s cscut 33904   0s c0s 33943

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-rep 5205  ax-sep 5218  ax-nul 5225  ax-pr 5347  ax-un 7566

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-ral 3068  df-rex 3069  df-reu 3070  df-rmo 3071  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3902  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-tp 4563  df-op 4565  df-uni 4837  df-int 4877  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-tr 5188  df-id 5480  df-eprel 5486  df-po 5494  df-so 5495  df-fr 5535  df-we 5537  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-ord 6254  df-on 6255  df-suc 6257  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-riota 7212  df-ov 7258  df-oprab 7259  df-mpo 7260  df-1o 8267  df-2o 8268  df-no 33773  df-slt 33774  df-bday 33775  df-sslt 33903  df-scut 33905  df-0s 33945

This theorem is referenced by:  bday0b  33951  bday1s  33952  left0s  34002  right0s  34003