Theorem leftf 34049

Description: The functionality of the left options function. (Contributed by Scott Fenton, 6-Aug-2024.)

Assertion

Ref	Expression
leftf	⊢ L : No ⟶𝒫 No

Proof of Theorem leftf

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

Step	Hyp	Ref	Expression
1		df-left 34034	. 2 ⊢ L = (𝑥 ∈ No ↦ {𝑦 ∈ ( O ‘( bday ‘𝑥)) ∣ 𝑦 <s 𝑥})
2		bdayelon 33971	. . . . . . . 8 ⊢ ( bday ‘𝑥) ∈ On
3		oldf 34041	. . . . . . . . 9 ⊢ O :On⟶𝒫 No
4	3	ffvelrni 6960	. . . . . . . 8 ⊢ (( bday ‘𝑥) ∈ On → ( O ‘( bday ‘𝑥)) ∈ 𝒫 No )
5	2, 4	mp1i 13	. . . . . . 7 ⊢ (𝑥 ∈ No → ( O ‘( bday ‘𝑥)) ∈ 𝒫 No )
6	5	elpwid 4544	. . . . . 6 ⊢ (𝑥 ∈ No → ( O ‘( bday ‘𝑥)) ⊆ No )
7	6	sselda 3921	. . . . 5 ⊢ ((𝑥 ∈ No ∧ 𝑦 ∈ ( O ‘( bday ‘𝑥))) → 𝑦 ∈ No )
8	7	a1d 25	. . . 4 ⊢ ((𝑥 ∈ No ∧ 𝑦 ∈ ( O ‘( bday ‘𝑥))) → (𝑦 <s 𝑥 → 𝑦 ∈ No ))
9	8	ralrimiva 3103	. . 3 ⊢ (𝑥 ∈ No → ∀𝑦 ∈ ( O ‘( bday ‘𝑥))(𝑦 <s 𝑥 → 𝑦 ∈ No ))
10		fvex 6787	. . . . . 6 ⊢ ( O ‘( bday ‘𝑥)) ∈ V
11	10	rabex 5256	. . . . 5 ⊢ {𝑦 ∈ ( O ‘( bday ‘𝑥)) ∣ 𝑦 <s 𝑥} ∈ V
12	11	elpw 4537	. . . 4 ⊢ ({𝑦 ∈ ( O ‘( bday ‘𝑥)) ∣ 𝑦 <s 𝑥} ∈ 𝒫 No ↔ {𝑦 ∈ ( O ‘( bday ‘𝑥)) ∣ 𝑦 <s 𝑥} ⊆ No )
13		rabss 4005	. . . 4 ⊢ ({𝑦 ∈ ( O ‘( bday ‘𝑥)) ∣ 𝑦 <s 𝑥} ⊆ No ↔ ∀𝑦 ∈ ( O ‘( bday ‘𝑥))(𝑦 <s 𝑥 → 𝑦 ∈ No ))
14	12, 13	bitri 274	. . 3 ⊢ ({𝑦 ∈ ( O ‘( bday ‘𝑥)) ∣ 𝑦 <s 𝑥} ∈ 𝒫 No ↔ ∀𝑦 ∈ ( O ‘( bday ‘𝑥))(𝑦 <s 𝑥 → 𝑦 ∈ No ))
15	9, 14	sylibr 233	. 2 ⊢ (𝑥 ∈ No → {𝑦 ∈ ( O ‘( bday ‘𝑥)) ∣ 𝑦 <s 𝑥} ∈ 𝒫 No )
16	1, 15	fmpti 6986	1 ⊢ L : No ⟶𝒫 No

Syntax hints:   → wi 4   ∧ wa 396   ∈ wcel 2106  ∀wral 3064  {crab 3068   ⊆ wss 3887  𝒫 cpw 4533   class class class wbr 5074  Oncon0 6266  ⟶wf 6429  ‘cfv 6433   No csur 33843   <s cslt 33844   bday cbday 33845   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:  ssltleft  34054  lrold  34077