Theorem bday0s 33667

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 33663	. . . 4 ⊢ 0s = (∅ |s ∅)
2	1	fveq2i 6679	. . 3 ⊢ ( bday ‘ 0s ) = ( bday ‘(∅ |s ∅))
3		0elpw 5222	. . . 4 ⊢ ∅ ∈ 𝒫 No
4		nulssgt 33637	. . . 4 ⊢ (∅ ∈ 𝒫 No → ∅ <<s ∅)
5		scutbday 33643	. . . 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 2761	. 2 ⊢ ( bday ‘ 0s ) = ∩ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)})
8		snelpwi 5303	. . . . . . . 8 ⊢ (𝑥 ∈ No → {𝑥} ∈ 𝒫 No )
9		nulsslt 33636	. . . . . . . . 9 ⊢ ({𝑥} ∈ 𝒫 No → ∅ <<s {𝑥})
10		nulssgt 33637	. . . . . . . . 9 ⊢ ({𝑥} ∈ 𝒫 No → {𝑥} <<s ∅)
11	9, 10	jca 515	. . . . . . . 8 ⊢ ({𝑥} ∈ 𝒫 No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
12	8, 11	syl 17	. . . . . . 7 ⊢ (𝑥 ∈ No → (∅ <<s {𝑥} ∧ {𝑥} <<s ∅))
13	12	rabeqc 3586	. . . . . 6 ⊢ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = No
14		bdaydm 33614	. . . . . 6 ⊢ dom bday = No
15	13, 14	eqtr4i 2764	. . . . 5 ⊢ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)} = dom bday
16	15	imaeq2i 5901	. . . 4 ⊢ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = ( bday “ dom bday )
17		imadmrn 5913	. . . 4 ⊢ ( bday “ dom bday ) = ran bday
18		bdayrn 33615	. . . 4 ⊢ ran bday = On
19	16, 17, 18	3eqtri 2765	. . 3 ⊢ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = On
20	19	inteqi 4840	. 2 ⊢ ∩ ( bday “ {𝑥 ∈ No ∣ (∅ <<s {𝑥} ∧ {𝑥} <<s ∅)}) = ∩ On
21		inton 6229	. 2 ⊢ ∩ On = ∅
22	7, 20, 21	3eqtri 2765	1 ⊢ ( bday ‘ 0s ) = ∅

Syntax hints:   ∧ wa 399   = wceq 1542   ∈ wcel 2114  {crab 3057  ∅c0 4211  𝒫 cpw 4488  {csn 4516  ∩ cint 4836   class class class wbr 5030  dom cdm 5525  ran crn 5526   “ cima 5528  Oncon0 6172  ‘cfv 6339  (class class class)co 7172   No csur 33488   bday cbday 33490   <<s csslt 33620   |s cscut 33622   0s c0s 33661

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2020  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2162  ax-12 2179  ax-ext 2710  ax-rep 5154  ax-sep 5167  ax-nul 5174  ax-pr 5296  ax-un 7481

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 847  df-3or 1089  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2075  df-mo 2540  df-eu 2570  df-clab 2717  df-cleq 2730  df-clel 2811  df-nfc 2881  df-ne 2935  df-ral 3058  df-rex 3059  df-reu 3060  df-rmo 3061  df-rab 3062  df-v 3400  df-sbc 3681  df-csb 3791  df-dif 3846  df-un 3848  df-in 3850  df-ss 3860  df-pss 3862  df-nul 4212  df-if 4415  df-pw 4490  df-sn 4517  df-pr 4519  df-tp 4521  df-op 4523  df-uni 4797  df-int 4837  df-iun 4883  df-br 5031  df-opab 5093  df-mpt 5111  df-tr 5137  df-id 5429  df-eprel 5434  df-po 5442  df-so 5443  df-fr 5483  df-we 5485  df-xp 5531  df-rel 5532  df-cnv 5533  df-co 5534  df-dm 5535  df-rn 5536  df-res 5537  df-ima 5538  df-ord 6175  df-on 6176  df-suc 6178  df-iota 6297  df-fun 6341  df-fn 6342  df-f 6343  df-f1 6344  df-fo 6345  df-f1o 6346  df-fv 6347  df-riota 7129  df-ov 7175  df-oprab 7176  df-mpo 7177  df-1o 8133  df-2o 8134  df-no 33491  df-slt 33492  df-bday 33493  df-sslt 33621  df-scut 33623  df-0s 33663

This theorem is referenced by:  bday0b  33669  bday1s  33670  left0s  33720  right0s  33721