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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 27788 | . 2 ⊢ |s : <<s ⟶ No | |
| 2 | lltr 27858 | . . . . 5 ⊢ ( L ‘𝑥) <<s ( R ‘𝑥) | |
| 3 | df-br 5099 | . . . . 5 ⊢ (( L ‘𝑥) <<s ( R ‘𝑥) ↔ 〈( L ‘𝑥), ( R ‘𝑥)〉 ∈ <<s ) | |
| 4 | 2, 3 | mpbi 230 | . . . 4 ⊢ 〈( L ‘𝑥), ( R ‘𝑥)〉 ∈ <<s |
| 5 | lrcut 27900 | . . . . 5 ⊢ (𝑥 ∈ No → (( L ‘𝑥) |s ( R ‘𝑥)) = 𝑥) | |
| 6 | 5 | eqcomd 2742 | . . . 4 ⊢ (𝑥 ∈ No → 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥))) |
| 7 | fveq2 6834 | . . . . . 6 ⊢ (𝑦 = 〈( L ‘𝑥), ( R ‘𝑥)〉 → ( |s ‘𝑦) = ( |s ‘〈( L ‘𝑥), ( R ‘𝑥)〉)) | |
| 8 | df-ov 7361 | . . . . . 6 ⊢ (( L ‘𝑥) |s ( R ‘𝑥)) = ( |s ‘〈( L ‘𝑥), ( R ‘𝑥)〉) | |
| 9 | 7, 8 | eqtr4di 2789 | . . . . 5 ⊢ (𝑦 = 〈( L ‘𝑥), ( R ‘𝑥)〉 → ( |s ‘𝑦) = (( L ‘𝑥) |s ( R ‘𝑥))) |
| 10 | 9 | rspceeqv 3599 | . . . 4 ⊢ ((〈( L ‘𝑥), ( R ‘𝑥)〉 ∈ <<s ∧ 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥))) → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)) |
| 11 | 4, 6, 10 | sylancr 587 | . . 3 ⊢ (𝑥 ∈ No → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)) |
| 12 | 11 | rgen 3053 | . 2 ⊢ ∀𝑥 ∈ No ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦) |
| 13 | dffo3 7047 | . 2 ⊢ ( |s : <<s –onto→ No ↔ ( |s : <<s ⟶ No ∧ ∀𝑥 ∈ No ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦))) | |
| 14 | 1, 12, 13 | mpbir2an 711 | 1 ⊢ |s : <<s –onto→ No |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1541 ∈ wcel 2113 ∀wral 3051 ∃wrex 3060 〈cop 4586 class class class wbr 5098 ⟶wf 6488 –onto→wfo 6490 ‘cfv 6492 (class class class)co 7358 No csur 27607 <<s cslts 27753 |s ccuts 27755 L cleft 27821 R cright 27822 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-rep 5224 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-rmo 3350 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-pss 3921 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-tp 4585 df-op 4587 df-uni 4864 df-int 4903 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-tr 5206 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7315 df-ov 7361 df-oprab 7362 df-mpo 7363 df-2nd 7934 df-frecs 8223 df-wrecs 8254 df-recs 8303 df-1o 8397 df-2o 8398 df-no 27610 df-lts 27611 df-bday 27612 df-slts 27754 df-cuts 27756 df-made 27823 df-old 27824 df-left 27826 df-right 27827 |
| This theorem is referenced by: (None) |
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