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Theorem scutf 27313
Description: Functionality statement for the surreal cut operator. (Contributed by Scott Fenton, 15-Dec-2021.)
Assertion
Ref Expression
scutf |s : <<s ⟶ No

Proof of Theorem scutf
Dummy variables 𝑎 𝑏 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-scut 27285 . . . 4 |s = (𝑎 ∈ 𝒫 No , 𝑏 ∈ ( <<s “ {𝑎}) ↦ (𝑥 ∈ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)} ( bday 𝑥) = ( bday “ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)})))
21mpofun 7532 . . 3 Fun |s
3 dmscut 27312 . . 3 dom |s = <<s
4 df-fn 6547 . . 3 ( |s Fn <<s ↔ (Fun |s ∧ dom |s = <<s ))
52, 3, 4mpbir2an 710 . 2 |s Fn <<s
61rnmpo 7542 . . 3 ran |s = {𝑧 ∣ ∃𝑎 ∈ 𝒫 No 𝑏 ∈ ( <<s “ {𝑎})𝑧 = (𝑥 ∈ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)} ( bday 𝑥) = ( bday “ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)}))}
7 vex 3479 . . . . . . . . . 10 𝑎 ∈ V
8 vex 3479 . . . . . . . . . 10 𝑏 ∈ V
97, 8elimasn 6089 . . . . . . . . 9 (𝑏 ∈ ( <<s “ {𝑎}) ↔ ⟨𝑎, 𝑏⟩ ∈ <<s )
10 df-br 5150 . . . . . . . . 9 (𝑎 <<s 𝑏 ↔ ⟨𝑎, 𝑏⟩ ∈ <<s )
119, 10bitr4i 278 . . . . . . . 8 (𝑏 ∈ ( <<s “ {𝑎}) ↔ 𝑎 <<s 𝑏)
12 scutval 27301 . . . . . . . . 9 (𝑎 <<s 𝑏 → (𝑎 |s 𝑏) = (𝑥 ∈ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)} ( bday 𝑥) = ( bday “ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)})))
13 scutcl 27303 . . . . . . . . 9 (𝑎 <<s 𝑏 → (𝑎 |s 𝑏) ∈ No )
1412, 13eqeltrrd 2835 . . . . . . . 8 (𝑎 <<s 𝑏 → (𝑥 ∈ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)} ( bday 𝑥) = ( bday “ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)})) ∈ No )
1511, 14sylbi 216 . . . . . . 7 (𝑏 ∈ ( <<s “ {𝑎}) → (𝑥 ∈ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)} ( bday 𝑥) = ( bday “ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)})) ∈ No )
16 eleq1a 2829 . . . . . . 7 ((𝑥 ∈ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)} ( bday 𝑥) = ( bday “ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)})) ∈ No → (𝑧 = (𝑥 ∈ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)} ( bday 𝑥) = ( bday “ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)})) → 𝑧 No ))
1715, 16syl 17 . . . . . 6 (𝑏 ∈ ( <<s “ {𝑎}) → (𝑧 = (𝑥 ∈ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)} ( bday 𝑥) = ( bday “ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)})) → 𝑧 No ))
1817adantl 483 . . . . 5 ((𝑎 ∈ 𝒫 No 𝑏 ∈ ( <<s “ {𝑎})) → (𝑧 = (𝑥 ∈ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)} ( bday 𝑥) = ( bday “ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)})) → 𝑧 No ))
1918rexlimivv 3200 . . . 4 (∃𝑎 ∈ 𝒫 No 𝑏 ∈ ( <<s “ {𝑎})𝑧 = (𝑥 ∈ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)} ( bday 𝑥) = ( bday “ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)})) → 𝑧 No )
2019abssi 4068 . . 3 {𝑧 ∣ ∃𝑎 ∈ 𝒫 No 𝑏 ∈ ( <<s “ {𝑎})𝑧 = (𝑥 ∈ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)} ( bday 𝑥) = ( bday “ {𝑦 No ∣ (𝑎 <<s {𝑦} ∧ {𝑦} <<s 𝑏)}))} ⊆ No
216, 20eqsstri 4017 . 2 ran |s ⊆ No
22 df-f 6548 . 2 ( |s : <<s ⟶ No ↔ ( |s Fn <<s ∧ ran |s ⊆ No ))
235, 21, 22mpbir2an 710 1 |s : <<s ⟶ No
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 397   = wceq 1542  wcel 2107  {cab 2710  wrex 3071  {crab 3433  wss 3949  𝒫 cpw 4603  {csn 4629  cop 4635   cint 4951   class class class wbr 5149  dom cdm 5677  ran crn 5678  cima 5680  Fun wfun 6538   Fn wfn 6539  wf 6540  cfv 6544  crio 7364  (class class class)co 7409   No csur 27143   bday cbday 27145   <<s csslt 27282   |s cscut 27284
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 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2704  ax-rep 5286  ax-sep 5300  ax-nul 5307  ax-pr 5428  ax-un 7725
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3or 1089  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-mo 2535  df-eu 2564  df-clab 2711  df-cleq 2725  df-clel 2811  df-nfc 2886  df-ne 2942  df-ral 3063  df-rex 3072  df-rmo 3377  df-reu 3378  df-rab 3434  df-v 3477  df-sbc 3779  df-csb 3895  df-dif 3952  df-un 3954  df-in 3956  df-ss 3966  df-pss 3968  df-nul 4324  df-if 4530  df-pw 4605  df-sn 4630  df-pr 4632  df-tp 4634  df-op 4636  df-uni 4910  df-int 4952  df-iun 5000  df-br 5150  df-opab 5212  df-mpt 5233  df-tr 5267  df-id 5575  df-eprel 5581  df-po 5589  df-so 5590  df-fr 5632  df-we 5634  df-xp 5683  df-rel 5684  df-cnv 5685  df-co 5686  df-dm 5687  df-rn 5688  df-res 5689  df-ima 5690  df-ord 6368  df-on 6369  df-suc 6371  df-iota 6496  df-fun 6546  df-fn 6547  df-f 6548  df-f1 6549  df-fo 6550  df-f1o 6551  df-fv 6552  df-riota 7365  df-ov 7412  df-oprab 7413  df-mpo 7414  df-1o 8466  df-2o 8467  df-no 27146  df-slt 27147  df-bday 27148  df-sslt 27283  df-scut 27285
This theorem is referenced by:  madeval  27347  madeval2  27348  scutfo  27398
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