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| Mirrors > Home > MPE Home > Th. List > cutsfo | Structured version Visualization version GIF version | ||
| Description: The surreal cut function is onto. (Contributed by Scott Fenton, 23-Aug-2024.) |
| Ref | Expression |
|---|---|
| cutsfo | ⊢ |s : <<s –onto→ No |
| Step | Hyp | Ref | 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 ) | |
| 4 | 2, 3 | mpbi 233 | . . . 4 ⊢ 〈( L ‘𝑥), ( R ‘𝑥)〉 ∈ <<s |
| 5 | lrcut 28075 | . . . . 5 ⊢ (𝑥 ∈ No → (( L ‘𝑥) |s ( R ‘𝑥)) = 𝑥) | |
| 6 | 5 | eqcomd 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)〉) | |
| 9 | 7, 8 | eqtr4di 2816 | . . . . 5 ⊢ (𝑦 = 〈( L ‘𝑥), ( R ‘𝑥)〉 → ( |s ‘𝑦) = (( L ‘𝑥) |s ( R ‘𝑥))) |
| 10 | 9 | rspceeqv 3605 | . . . 4 ⊢ ((〈( L ‘𝑥), ( R ‘𝑥)〉 ∈ <<s ∧ 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥))) → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)) |
| 11 | 4, 6, 10 | sylancr 598 | . . 3 ⊢ (𝑥 ∈ No → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)) |
| 12 | 11 | rgen 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))) | |
| 14 | 1, 12, 13 | mpbir2an 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 –onto→wfo 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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