Theorem ssltleft 34054

Description: A surreal is greater than its left options. Theorem 0(ii) of [Conway] p. 16. (Contributed by Scott Fenton, 7-Aug-2024.)

Assertion

Ref	Expression
ssltleft	⊢ (𝐴 ∈ No → ( L ‘𝐴) <<s {𝐴})

Proof of Theorem ssltleft

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		fvexd 6789	. 2 ⊢ (𝐴 ∈ No → ( L ‘𝐴) ∈ V)
2		snex 5354	. . 3 ⊢ {𝐴} ∈ V
3	2	a1i 11	. 2 ⊢ (𝐴 ∈ No → {𝐴} ∈ V)
4		leftf 34049	. . . 4 ⊢ L : No ⟶𝒫 No
5	4	ffvelrni 6960	. . 3 ⊢ (𝐴 ∈ No → ( L ‘𝐴) ∈ 𝒫 No )
6	5	elpwid 4544	. 2 ⊢ (𝐴 ∈ No → ( L ‘𝐴) ⊆ No )
7		snssi 4741	. 2 ⊢ (𝐴 ∈ No → {𝐴} ⊆ No )
8		velsn 4577	. . . 4 ⊢ (𝑦 ∈ {𝐴} ↔ 𝑦 = 𝐴)
9		leftval 34047	. . . . . . . . . 10 ⊢ ( L ‘𝐴) = {𝑥 ∈ ( O ‘( bday ‘𝐴)) ∣ 𝑥 <s 𝐴}
10	9	a1i 11	. . . . . . . . 9 ⊢ (𝐴 ∈ No → ( L ‘𝐴) = {𝑥 ∈ ( O ‘( bday ‘𝐴)) ∣ 𝑥 <s 𝐴})
11	10	eleq2d 2824	. . . . . . . 8 ⊢ (𝐴 ∈ No → (𝑥 ∈ ( L ‘𝐴) ↔ 𝑥 ∈ {𝑥 ∈ ( O ‘( bday ‘𝐴)) ∣ 𝑥 <s 𝐴}))
12		rabid 3310	. . . . . . . 8 ⊢ (𝑥 ∈ {𝑥 ∈ ( O ‘( bday ‘𝐴)) ∣ 𝑥 <s 𝐴} ↔ (𝑥 ∈ ( O ‘( bday ‘𝐴)) ∧ 𝑥 <s 𝐴))
13	11, 12	bitrdi 287	. . . . . . 7 ⊢ (𝐴 ∈ No → (𝑥 ∈ ( L ‘𝐴) ↔ (𝑥 ∈ ( O ‘( bday ‘𝐴)) ∧ 𝑥 <s 𝐴)))
14	13	simplbda 500	. . . . . 6 ⊢ ((𝐴 ∈ No ∧ 𝑥 ∈ ( L ‘𝐴)) → 𝑥 <s 𝐴)
15		breq2 5078	. . . . . 6 ⊢ (𝑦 = 𝐴 → (𝑥 <s 𝑦 ↔ 𝑥 <s 𝐴))
16	14, 15	syl5ibr 245	. . . . 5 ⊢ (𝑦 = 𝐴 → ((𝐴 ∈ No ∧ 𝑥 ∈ ( L ‘𝐴)) → 𝑥 <s 𝑦))
17	16	expd 416	. . . 4 ⊢ (𝑦 = 𝐴 → (𝐴 ∈ No → (𝑥 ∈ ( L ‘𝐴) → 𝑥 <s 𝑦)))
18	8, 17	sylbi 216	. . 3 ⊢ (𝑦 ∈ {𝐴} → (𝐴 ∈ No → (𝑥 ∈ ( L ‘𝐴) → 𝑥 <s 𝑦)))
19	18	3imp231 1112	. 2 ⊢ ((𝐴 ∈ No ∧ 𝑥 ∈ ( L ‘𝐴) ∧ 𝑦 ∈ {𝐴}) → 𝑥 <s 𝑦)
20	1, 3, 6, 7, 19	ssltd 33986	1 ⊢ (𝐴 ∈ No → ( L ‘𝐴) <<s {𝐴})

Syntax hints:   → wi 4   ∧ wa 396   = wceq 1539   ∈ wcel 2106  {crab 3068  Vcvv 3432  𝒫 cpw 4533  {csn 4561   class class class wbr 5074  ‘cfv 6433   No csur 33843   <s cslt 33844   bday cbday 33845   <<s csslt 33975   O cold 34027   L cleft 34029

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-pow 5288  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-pred 6202  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-2nd 7832  df-frecs 8097  df-wrecs 8128  df-recs 8202  df-1o 8297  df-2o 8298  df-no 33846  df-slt 33847  df-bday 33848  df-sslt 33976  df-scut 33978  df-made 34031  df-old 34032  df-left 34034

This theorem is referenced by:  lltropt  34056  madebdaylemlrcut  34079