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| Mirrors > Home > MPE Home > Th. List > mulscld | Structured version Visualization version GIF version | ||
| Description: The surreals are closed under multiplication. Theorem 8(i) of [Conway] p. 19. (Contributed by Scott Fenton, 6-Mar-2025.) |
| Ref | Expression |
|---|---|
| mulscld.1 | ⊢ (𝜑 → 𝐴 ∈ No ) |
| mulscld.2 | ⊢ (𝜑 → 𝐵 ∈ No ) |
| Ref | Expression |
|---|---|
| mulscld | ⊢ (𝜑 → (𝐴 ·s 𝐵) ∈ No ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mulscld.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ No ) | |
| 2 | mulscld.2 | . 2 ⊢ (𝜑 → 𝐵 ∈ No ) | |
| 3 | mulscl 28060 | . 2 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ) → (𝐴 ·s 𝐵) ∈ No ) | |
| 4 | 1, 2, 3 | syl2anc 584 | 1 ⊢ (𝜑 → (𝐴 ·s 𝐵) ∈ No ) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2109 (class class class)co 7353 No csur 27567 ·s cmuls 28032 |
| 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 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5221 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7675 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-ral 3045 df-rex 3054 df-rmo 3345 df-reu 3346 df-rab 3397 df-v 3440 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4479 df-pw 4555 df-sn 4580 df-pr 4582 df-tp 4584 df-op 4586 df-ot 4588 df-uni 4862 df-int 4900 df-iun 4946 df-br 5096 df-opab 5158 df-mpt 5177 df-tr 5203 df-id 5518 df-eprel 5523 df-po 5531 df-so 5532 df-fr 5576 df-se 5577 df-we 5578 df-xp 5629 df-rel 5630 df-cnv 5631 df-co 5632 df-dm 5633 df-rn 5634 df-res 5635 df-ima 5636 df-pred 6253 df-ord 6314 df-on 6315 df-suc 6317 df-iota 6442 df-fun 6488 df-fn 6489 df-f 6490 df-f1 6491 df-fo 6492 df-f1o 6493 df-fv 6494 df-riota 7310 df-ov 7356 df-oprab 7357 df-mpo 7358 df-1st 7931 df-2nd 7932 df-frecs 8221 df-wrecs 8252 df-recs 8301 df-1o 8395 df-2o 8396 df-nadd 8591 df-no 27570 df-slt 27571 df-bday 27572 df-sle 27673 df-sslt 27710 df-scut 27712 df-0s 27756 df-made 27775 df-old 27776 df-left 27778 df-right 27779 df-norec 27868 df-norec2 27879 df-adds 27890 df-negs 27950 df-subs 27951 df-muls 28033 |
| This theorem is referenced by: slemuld 28064 mulscom 28065 mulsge0d 28072 ssltmul1 28073 ssltmul2 28074 mulsuniflem 28075 addsdilem3 28079 addsdilem4 28080 subsdid 28084 mulnegs1d 28086 mul2negsd 28088 mulsasslem3 28091 muls4d 28094 mulsunif2lem 28095 sltmul2 28097 slemul2d 28100 slemul1d 28101 sltmulneg1d 28102 mulscan2dlem 28104 mulscan2d 28105 sltmul12ad 28109 norecdiv 28116 divsasswd 28129 precsexlem8 28139 precsexlem9 28140 precsexlem10 28141 precsexlem11 28142 divmuldivsd 28157 divdivs1d 28158 divsrecd 28159 divscan3d 28161 onmulscl 28198 eucliddivs 28288 n0seo 28331 zseo 28332 pw2recs 28348 pw2divscan3d 28351 pw2divscan4d 28354 pw2divsrecd 28357 halfcut 28364 addhalfcut 28365 zs12addscl 28372 zs12zodd 28377 zs12ge0 28378 zs12bday 28379 |
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