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Theorem cutsfo 28076
Description: The surreal cut function is onto. (Contributed by Scott Fenton, 23-Aug-2024.)
Assertion
Ref Expression
cutsfo |s : <<s –onto No

Proof of Theorem cutsfo
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 cutsf 27963 . 2 |s : <<s ⟶ No
2 lltr 28033 . . . . 5 ( L ‘𝑥) <<s ( R ‘𝑥)
3 df-br 5111 . . . . 5 (( L ‘𝑥) <<s ( R ‘𝑥) ↔ ⟨( L ‘𝑥), ( R ‘𝑥)⟩ ∈ <<s )
42, 3mpbi 233 . . . 4 ⟨( L ‘𝑥), ( R ‘𝑥)⟩ ∈ <<s
5 lrcut 28075 . . . . 5 (𝑥 No → (( L ‘𝑥) |s ( R ‘𝑥)) = 𝑥)
65eqcomd 2769 . . . 4 (𝑥 No 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥)))
7 fveq2 6883 . . . . . 6 (𝑦 = ⟨( L ‘𝑥), ( R ‘𝑥)⟩ → ( |s ‘𝑦) = ( |s ‘⟨( L ‘𝑥), ( R ‘𝑥)⟩))
8 df-ov 7415 . . . . . 6 (( L ‘𝑥) |s ( R ‘𝑥)) = ( |s ‘⟨( L ‘𝑥), ( R ‘𝑥)⟩)
97, 8eqtr4di 2816 . . . . 5 (𝑦 = ⟨( L ‘𝑥), ( R ‘𝑥)⟩ → ( |s ‘𝑦) = (( L ‘𝑥) |s ( R ‘𝑥)))
109rspceeqv 3605 . . . 4 ((⟨( L ‘𝑥), ( R ‘𝑥)⟩ ∈ <<s ∧ 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥))) → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦))
114, 6, 10sylancr 598 . . 3 (𝑥 No → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦))
1211rgen 3081 . 2 𝑥 No 𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)
13 dffo3 7099 . 2 ( |s : <<s –onto No ↔ ( |s : <<s ⟶ No ∧ ∀𝑥 No 𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)))
141, 12, 13mpbir2an 723 1 |s : <<s –onto No
Colors of variables: wff setvar class
Syntax hints:   = wceq 1570  wcel 2143  wral 3079  wrex 3089  cop 4596   class class class wbr 5110  wf 6534  ontowfo 6536  cfv 6538  (class class class)co 7412   No csur 27782   <<s cslts 27928   |s ccuts 27930   L cleft 27996   R cright 27997
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-rep 5239  ax-sep 5258  ax-nul 5270  ax-pow 5338  ax-pr 5406  ax-un 7734
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rmo 3369  df-reu 3370  df-rab 3417  df-v 3457  df-sbc 3746  df-csb 3855  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-pss 3926  df-nul 4288  df-if 4489  df-pw 4565  df-sn 4591  df-pr 4593  df-tp 4595  df-op 4597  df-uni 4874  df-int 4914  df-iun 4959  df-br 5111  df-opab 5175  df-mpt 5194  df-tr 5220  df-id 5558  df-eprel 5563  df-po 5571  df-so 5572  df-fr 5616  df-we 5618  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-res 5675  df-ima 5676  df-pred 6304  df-ord 6365  df-on 6366  df-suc 6368  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-f1 6543  df-fo 6544  df-f1o 6545  df-fv 6546  df-riota 7369  df-ov 7415  df-oprab 7416  df-mpo 7417  df-2nd 7988  df-frecs 8279  df-wrecs 8310  df-recs 8359  df-1o 8454  df-2o 8455  df-no 27785  df-lts 27786  df-bday 27787  df-slts 27929  df-cuts 27931  df-made 27998  df-old 27999  df-left 28001  df-right 28002
This theorem is referenced by: (None)
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