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| Description: Function statement for surreal negation. (Contributed by Scott Fenton, 3-Feb-2025.) | 
| Ref | Expression | 
|---|---|
| negsfo | ⊢ -us : No –onto→ No | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | negsf 28084 | . 2 ⊢ -us : No ⟶ No | |
| 2 | negscl 28068 | . . . 4 ⊢ (𝑥 ∈ No → ( -us ‘𝑥) ∈ No ) | |
| 3 | negnegs 28076 | . . . . 5 ⊢ (𝑥 ∈ No → ( -us ‘( -us ‘𝑥)) = 𝑥) | |
| 4 | 3 | eqcomd 2743 | . . . 4 ⊢ (𝑥 ∈ No → 𝑥 = ( -us ‘( -us ‘𝑥))) | 
| 5 | fveq2 6906 | . . . . . 6 ⊢ (𝑦 = ( -us ‘𝑥) → ( -us ‘𝑦) = ( -us ‘( -us ‘𝑥))) | |
| 6 | 5 | eqeq2d 2748 | . . . . 5 ⊢ (𝑦 = ( -us ‘𝑥) → (𝑥 = ( -us ‘𝑦) ↔ 𝑥 = ( -us ‘( -us ‘𝑥)))) | 
| 7 | 6 | rspcev 3622 | . . . 4 ⊢ ((( -us ‘𝑥) ∈ No ∧ 𝑥 = ( -us ‘( -us ‘𝑥))) → ∃𝑦 ∈ No 𝑥 = ( -us ‘𝑦)) | 
| 8 | 2, 4, 7 | syl2anc 584 | . . 3 ⊢ (𝑥 ∈ No → ∃𝑦 ∈ No 𝑥 = ( -us ‘𝑦)) | 
| 9 | 8 | rgen 3063 | . 2 ⊢ ∀𝑥 ∈ No ∃𝑦 ∈ No 𝑥 = ( -us ‘𝑦) | 
| 10 | dffo3 7122 | . 2 ⊢ ( -us : No –onto→ No ↔ ( -us : No ⟶ No ∧ ∀𝑥 ∈ No ∃𝑦 ∈ No 𝑥 = ( -us ‘𝑦))) | |
| 11 | 1, 9, 10 | mpbir2an 711 | 1 ⊢ -us : No –onto→ No | 
| Colors of variables: wff setvar class | 
| Syntax hints: = wceq 1540 ∈ wcel 2108 ∀wral 3061 ∃wrex 3070 ⟶wf 6557 –onto→wfo 6559 ‘cfv 6561 No csur 27684 -us cnegs 28051 | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-rep 5279 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 | 
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-ral 3062 df-rex 3071 df-rmo 3380 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-tp 4631 df-op 4633 df-ot 4635 df-uni 4908 df-int 4947 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-se 5638 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-pred 6321 df-ord 6387 df-on 6388 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-1st 8014 df-2nd 8015 df-frecs 8306 df-wrecs 8337 df-recs 8411 df-1o 8506 df-2o 8507 df-nadd 8704 df-no 27687 df-slt 27688 df-bday 27689 df-sle 27790 df-sslt 27826 df-scut 27828 df-0s 27869 df-made 27886 df-old 27887 df-left 27889 df-right 27890 df-norec 27971 df-norec2 27982 df-adds 27993 df-negs 28053 | 
| This theorem is referenced by: negsf1o 28086 negsunif 28087 negsbdaylem 28088 | 
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