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| Mirrors > Home > MPE Home > Th. List > subscl | Structured version Visualization version GIF version | ||
| Description: Closure law for surreal subtraction. (Contributed by Scott Fenton, 3-Feb-2025.) |
| Ref | Expression |
|---|---|
| subscl | ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No) → (𝐴 −s 𝐵) ∈ No) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | subsval 28503 | . 2 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No) → (𝐴 −s 𝐵) = (𝐴 +s ( -s‘𝐵))) | |
| 2 | negscl 28479 | . . 3 ⊢ (𝐵 ∈ No → ( -s‘𝐵) ∈ No) | |
| 3 | addscl 28424 | . . 3 ⊢ ((𝐴 ∈ No ∧ ( -s‘𝐵) ∈ No) → (𝐴 +s ( -s‘𝐵)) ∈ No) | |
| 4 | 2, 3 | sylan2 605 | . 2 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No) → (𝐴 +s ( -s‘𝐵)) ∈ No) |
| 5 | 1, 4 | eqeltrd 2864 | 1 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No) → (𝐴 −s 𝐵) ∈ No) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2147 ‘cfv 6566 (class class class)co 7451 Nocsur 28054 +s cadds 28402 -scnegs 28462 −s csubs 28463 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-rep 5238 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-tp 4593 df-op 4841 df-uni 4873 df-int 4913 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-se 5612 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-pred 6330 df-ord 6391 df-on 6392 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-1st 8035 df-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-1o 8514 df-2o 8515 df-nadd 8713 df-no 28057 df-lts 28058 df-bday 28059 df-slts 28201 df-cuts 28203 df-0s 28250 df-made 28270 df-old 28271 df-left 28273 df-right 28274 df-norec 28381 df-norec2 28392 df-adds 28403 df-negs 28464 df-subs 28465 |
| This theorem is used by: subscld 28506 npcans 28518 abssubs 28693 n0cut 28777 n0on 28779 elzn0s 28841 zseo 28865 bdayfinbndlem1 28910 recut 28937 |
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