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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 28189 | . . 3 ⊢ (𝜑 → (𝐵 +s 𝐶) = (𝐶 +s 𝐵)) |
| 4 | 3 | oveq2d 7432 | . 2 ⊢ (𝜑 → (𝐴 +s (𝐵 +s 𝐶)) = (𝐴 +s (𝐶 +s 𝐵))) |
| 5 | addsassd.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ No ) | |
| 6 | 5, 1, 2 | addsassd 28228 | . 2 ⊢ (𝜑 → ((𝐴 +s 𝐵) +s 𝐶) = (𝐴 +s (𝐵 +s 𝐶))) |
| 7 | 5, 2, 1 | addsassd 28228 | . 2 ⊢ (𝜑 → ((𝐴 +s 𝐶) +s 𝐵) = (𝐴 +s (𝐶 +s 𝐵))) |
| 8 | 4, 6, 7 | 3eqtr4d 2810 | 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 1570 ∈ wcel 2146 (class class class)co 7416 No csur 27833 +s cadds 28181 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-rep 5240 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7738 |
| 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 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3082 df-rex 3092 df-rmo 3371 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-tp 4596 df-op 4598 df-ot 4600 df-uni 4875 df-int 4915 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-se 5617 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6306 df-ord 6367 df-on 6368 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-1st 7988 df-2nd 7989 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-1o 8455 df-2o 8456 df-nadd 8654 df-no 27836 df-lts 27837 df-bday 27838 df-les 27938 df-slts 27980 df-cuts 27982 df-0s 28029 df-made 28049 df-old 28050 df-left 28052 df-right 28053 df-norec2 28171 df-adds 28182 |
| This theorem is used by: adds4d 28231 subadds 28292 addsubsd 28304 ltsubsubsbd 28305 peano5uzs 28626 readdscl 28721 |
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