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| Mirrors > Home > MPE Home > Th. List > addsfo | Structured version Visualization version GIF version | ||
| Description: Surreal addition is onto. (Contributed by Scott Fenton, 21-Jan-2025.) |
| Ref | Expression |
|---|---|
| addsfo | ⊢ +s :( No × No )–onto→ No |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | addsf 27990 | . 2 ⊢ +s :( No × No )⟶ No | |
| 2 | 0no 27817 | . . . . 5 ⊢ 0s ∈ No | |
| 3 | opelxpi 5669 | . . . . 5 ⊢ ((𝑧 ∈ No ∧ 0s ∈ No ) → 〈𝑧, 0s 〉 ∈ ( No × No )) | |
| 4 | 2, 3 | mpan2 692 | . . . 4 ⊢ (𝑧 ∈ No → 〈𝑧, 0s 〉 ∈ ( No × No )) |
| 5 | addsrid 27972 | . . . . 5 ⊢ (𝑧 ∈ No → (𝑧 +s 0s ) = 𝑧) | |
| 6 | 5 | eqcomd 2743 | . . . 4 ⊢ (𝑧 ∈ No → 𝑧 = (𝑧 +s 0s )) |
| 7 | fveq2 6842 | . . . . . 6 ⊢ (𝑥 = 〈𝑧, 0s 〉 → ( +s ‘𝑥) = ( +s ‘〈𝑧, 0s 〉)) | |
| 8 | df-ov 7371 | . . . . . 6 ⊢ (𝑧 +s 0s ) = ( +s ‘〈𝑧, 0s 〉) | |
| 9 | 7, 8 | eqtr4di 2790 | . . . . 5 ⊢ (𝑥 = 〈𝑧, 0s 〉 → ( +s ‘𝑥) = (𝑧 +s 0s )) |
| 10 | 9 | rspceeqv 3601 | . . . 4 ⊢ ((〈𝑧, 0s 〉 ∈ ( No × No ) ∧ 𝑧 = (𝑧 +s 0s )) → ∃𝑥 ∈ ( No × No )𝑧 = ( +s ‘𝑥)) |
| 11 | 4, 6, 10 | syl2anc 585 | . . 3 ⊢ (𝑧 ∈ No → ∃𝑥 ∈ ( No × No )𝑧 = ( +s ‘𝑥)) |
| 12 | 11 | rgen 3054 | . 2 ⊢ ∀𝑧 ∈ No ∃𝑥 ∈ ( No × No )𝑧 = ( +s ‘𝑥) |
| 13 | dffo3 7056 | . 2 ⊢ ( +s :( No × No )–onto→ No ↔ ( +s :( No × No )⟶ No ∧ ∀𝑧 ∈ No ∃𝑥 ∈ ( No × No )𝑧 = ( +s ‘𝑥))) | |
| 14 | 1, 12, 13 | mpbir2an 712 | 1 ⊢ +s :( No × No )–onto→ No |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1542 ∈ wcel 2114 ∀wral 3052 ∃wrex 3062 〈cop 4588 × cxp 5630 ⟶wf 6496 –onto→wfo 6498 ‘cfv 6500 (class class class)co 7368 No csur 27619 0s c0s 27813 +s cadds 27967 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-tp 4587 df-op 4589 df-uni 4866 df-int 4905 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-se 5586 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-1st 7943 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-1o 8407 df-2o 8408 df-nadd 8604 df-no 27622 df-lts 27623 df-bday 27624 df-slts 27766 df-cuts 27768 df-0s 27815 df-made 27835 df-old 27836 df-left 27838 df-right 27839 df-norec2 27957 df-adds 27968 |
| This theorem is referenced by: (None) |
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