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| Mirrors > Home > MPE Home > Th. List > adds32d | Structured version Visualization version GIF version | ||
| Description: Commutative/associative law that swaps the last two terms in a triple sum. (Contributed by Scott Fenton, 22-Jan-2025.) |
| Ref | Expression |
|---|---|
| addsassd.1 | ⊢ (𝜑 → 𝐴 ∈ No) |
| addsassd.2 | ⊢ (𝜑 → 𝐵 ∈ No) |
| addsassd.3 | ⊢ (𝜑 → 𝐶 ∈ No) |
| Ref | Expression |
|---|---|
| adds32d | ⊢ (𝜑 → ((𝐴 +s 𝐵) +s 𝐶) = ((𝐴 +s 𝐶) +s 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | addsassd.2 | . . . 4 ⊢ (𝜑 → 𝐵 ∈ No) | |
| 2 | addsassd.3 | . . . 4 ⊢ (𝜑 → 𝐶 ∈ No) | |
| 3 | 1, 2 | addscomd 28359 | . . 3 ⊢ (𝜑 → (𝐵 +s 𝐶) = (𝐶 +s 𝐵)) |
| 4 | 3 | oveq2d 7437 | . 2 ⊢ (𝜑 → (𝐴 +s (𝐵 +s 𝐶)) = (𝐴 +s (𝐶 +s 𝐵))) |
| 5 | addsassd.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ No) | |
| 6 | 5, 1, 2 | addsassd 28398 | . 2 ⊢ (𝜑 → ((𝐴 +s 𝐵) +s 𝐶) = (𝐴 +s (𝐵 +s 𝐶))) |
| 7 | 5, 2, 1 | addsassd 28398 | . 2 ⊢ (𝜑 → ((𝐴 +s 𝐶) +s 𝐵) = (𝐴 +s (𝐶 +s 𝐵))) |
| 8 | 4, 6, 7 | 3eqtr4d 2805 | 1 ⊢ (𝜑 → ((𝐴 +s 𝐵) +s 𝐶) = ((𝐴 +s 𝐶) +s 𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1569 ∈ wcel 2144 (class class class)co 7421 Nocsur 28003 +s cadds 28351 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7752 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-tp 4589 df-op 4835 df-ot 4858 df-uni 4867 df-int 4907 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-se 5604 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-suc 6368 df-iota 6494 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-riota 7378 df-ov 7424 df-oprab 7425 df-mpo 7426 df-1st 8002 df-2nd 8003 df-frecs 8303 df-wrecs 8334 df-recs 8383 df-1o 8480 df-2o 8481 df-nadd 8679 df-no 28006 df-lts 28007 df-bday 28008 df-les 28108 df-slts 28150 df-cuts 28152 df-0s 28199 df-made 28219 df-old 28220 df-left 28222 df-right 28223 df-norec2 28341 df-adds 28352 |
| This theorem is used by: adds4d 28401 subadds 28462 addsubsd 28474 ltsubsubsbd 28475 peano5uzs 28796 readdscl 28891 |
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