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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 28022 | . 2 ⊢ |s : <<s ⟶ No | |
| 2 | lltr 28092 | . . . . 5 ⊢ ( L ‘𝑥) <<s ( R ‘𝑥) | |
| 3 | df-br 5115 | . . . . 5 ⊢ (( L ‘𝑥) <<s ( R ‘𝑥) ↔ 〈( L ‘𝑥), ( R ‘𝑥)〉 ∈ <<s ) | |
| 4 | 2, 3 | mpbi 233 | . . . 4 ⊢ 〈( L ‘𝑥), ( R ‘𝑥)〉 ∈ <<s |
| 5 | lrcut 28134 | . . . . 5 ⊢ (𝑥 ∈ No → (( L ‘𝑥) |s ( R ‘𝑥)) = 𝑥) | |
| 6 | 5 | eqcomd 2772 | . . . 4 ⊢ (𝑥 ∈ No → 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥))) |
| 7 | fveq2 6888 | . . . . . 6 ⊢ (𝑦 = 〈( L ‘𝑥), ( R ‘𝑥)〉 → ( |s ‘𝑦) = ( |s ‘〈( L ‘𝑥), ( R ‘𝑥)〉)) | |
| 8 | df-ov 7426 | . . . . . 6 ⊢ (( L ‘𝑥) |s ( R ‘𝑥)) = ( |s ‘〈( L ‘𝑥), ( R ‘𝑥)〉) | |
| 9 | 7, 8 | eqtr4di 2819 | . . . . 5 ⊢ (𝑦 = 〈( L ‘𝑥), ( R ‘𝑥)〉 → ( |s ‘𝑦) = (( L ‘𝑥) |s ( R ‘𝑥))) |
| 10 | 9 | rspceeqv 3607 | . . . 4 ⊢ ((〈( L ‘𝑥), ( R ‘𝑥)〉 ∈ <<s ∧ 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥))) → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)) |
| 11 | 4, 6, 10 | sylancr 599 | . . 3 ⊢ (𝑥 ∈ No → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)) |
| 12 | 11 | rgen 3084 | . 2 ⊢ ∀𝑥 ∈ No ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦) |
| 13 | dffo3 7104 | . 2 ⊢ ( |s : <<s –onto→ No ↔ ( |s : <<s ⟶ No ∧ ∀𝑥 ∈ No ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦))) | |
| 14 | 1, 12, 13 | mpbir2an 724 | 1 ⊢ |s : <<s –onto→ No |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 ∈ wcel 2146 ∀wral 3082 ∃wrex 3092 〈cop 4600 class class class wbr 5114 ⟶wf 6539 –onto→wfo 6541 ‘cfv 6543 (class class class)co 7423 No csur 27841 <<s cslts 27987 |s ccuts 27989 L cleft 28055 R cright 28056 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2738 ax-rep 5243 ax-sep 5262 ax-nul 5274 ax-pow 5341 ax-pr 5409 ax-un 7745 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2570 df-eu 2600 df-clab 2745 df-cleq 2758 df-clel 2841 df-nfc 2915 df-ne 2962 df-ral 3083 df-rex 3093 df-rmo 3372 df-reu 3373 df-rab 3420 df-v 3460 df-sbc 3748 df-csb 3857 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-pss 3928 df-nul 4290 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-tp 4599 df-op 4601 df-uni 4878 df-int 4918 df-iun 4963 df-br 5115 df-opab 5179 df-mpt 5198 df-tr 5224 df-id 5561 df-eprel 5566 df-po 5574 df-so 5575 df-fr 5619 df-we 5621 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-ima 5679 df-pred 6309 df-ord 6370 df-on 6371 df-suc 6373 df-iota 6499 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7380 df-ov 7426 df-oprab 7427 df-mpo 7428 df-2nd 7996 df-frecs 8287 df-wrecs 8318 df-recs 8367 df-1o 8462 df-2o 8463 df-no 27844 df-lts 27845 df-bday 27846 df-slts 27988 df-cuts 27990 df-made 28057 df-old 28058 df-left 28060 df-right 28061 |
| This theorem is used by: (None) |
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