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| Mirrors > Home > MPE Home > Th. List > npcans | Structured version Visualization version GIF version | ||
| Description: Cancellation law for surreal subtraction. (Contributed by Scott Fenton, 4-Feb-2025.) |
| Ref | Expression |
|---|---|
| npcans | ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ) → ((𝐴 -s 𝐵) +s 𝐵) = 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | subscl 27973 | . . 3 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ) → (𝐴 -s 𝐵) ∈ No ) | |
| 2 | simpr 484 | . . 3 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ) → 𝐵 ∈ No ) | |
| 3 | 1, 2 | addscomd 27881 | . 2 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ) → ((𝐴 -s 𝐵) +s 𝐵) = (𝐵 +s (𝐴 -s 𝐵))) |
| 4 | pncan3s 27984 | . . 3 ⊢ ((𝐵 ∈ No ∧ 𝐴 ∈ No ) → (𝐵 +s (𝐴 -s 𝐵)) = 𝐴) | |
| 5 | 4 | ancoms 458 | . 2 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ) → (𝐵 +s (𝐴 -s 𝐵)) = 𝐴) |
| 6 | 3, 5 | eqtrd 2765 | 1 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ) → ((𝐴 -s 𝐵) +s 𝐵) = 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1540 ∈ wcel 2109 (class class class)co 7390 No csur 27558 +s cadds 27873 -s csubs 27933 |
| 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 2702 ax-rep 5237 ax-sep 5254 ax-nul 5264 ax-pow 5323 ax-pr 5390 ax-un 7714 |
| 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 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-rmo 3356 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3757 df-csb 3866 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-pss 3937 df-nul 4300 df-if 4492 df-pw 4568 df-sn 4593 df-pr 4595 df-tp 4597 df-op 4599 df-ot 4601 df-uni 4875 df-int 4914 df-iun 4960 df-br 5111 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5536 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5594 df-se 5595 df-we 5596 df-xp 5647 df-rel 5648 df-cnv 5649 df-co 5650 df-dm 5651 df-rn 5652 df-res 5653 df-ima 5654 df-pred 6277 df-ord 6338 df-on 6339 df-suc 6341 df-iota 6467 df-fun 6516 df-fn 6517 df-f 6518 df-f1 6519 df-fo 6520 df-f1o 6521 df-fv 6522 df-riota 7347 df-ov 7393 df-oprab 7394 df-mpo 7395 df-1st 7971 df-2nd 7972 df-frecs 8263 df-wrecs 8294 df-recs 8343 df-1o 8437 df-2o 8438 df-nadd 8633 df-no 27561 df-slt 27562 df-bday 27563 df-sle 27664 df-sslt 27700 df-scut 27702 df-0s 27743 df-made 27762 df-old 27763 df-left 27765 df-right 27766 df-norec 27852 df-norec2 27863 df-adds 27874 df-negs 27934 df-subs 27935 |
| This theorem is referenced by: sltsubsubbd 27994 sltsubaddd 28000 posdifsd 28008 subsge0d 28010 n0scut 28233 eucliddivs 28272 peano5uzs 28299 |
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