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| Mirrors > Home > MPE Home > Th. List > muls4d | Structured version Visualization version GIF version | ||
| Description: Rearrangement of four surreal factors. (Contributed by Scott Fenton, 16-Apr-2025.) |
| Ref | Expression |
|---|---|
| muls4d.1 | ⊢ (𝜑 → 𝐴 ∈ No) |
| muls4d.2 | ⊢ (𝜑 → 𝐵 ∈ No) |
| muls4d.3 | ⊢ (𝜑 → 𝐶 ∈ No) |
| muls4d.4 | ⊢ (𝜑 → 𝐷 ∈ No) |
| Ref | Expression |
|---|---|
| muls4d | ⊢ (𝜑 → ((𝐴 ·s 𝐵) ·s (𝐶 ·s 𝐷)) = ((𝐴 ·s 𝐶) ·s (𝐵 ·s 𝐷))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | muls4d.2 | . . . . . 6 ⊢ (𝜑 → 𝐵 ∈ No) | |
| 2 | muls4d.3 | . . . . . 6 ⊢ (𝜑 → 𝐶 ∈ No) | |
| 3 | 1, 2 | mulscomd 28526 | . . . . 5 ⊢ (𝜑 → (𝐵 ·s 𝐶) = (𝐶 ·s 𝐵)) |
| 4 | 3 | oveq1d 7435 | . . . 4 ⊢ (𝜑 → ((𝐵 ·s 𝐶) ·s 𝐷) = ((𝐶 ·s 𝐵) ·s 𝐷)) |
| 5 | muls4d.4 | . . . . 5 ⊢ (𝜑 → 𝐷 ∈ No) | |
| 6 | 1, 2, 5 | mulsassd 28553 | . . . 4 ⊢ (𝜑 → ((𝐵 ·s 𝐶) ·s 𝐷) = (𝐵 ·s (𝐶 ·s 𝐷))) |
| 7 | 2, 1, 5 | mulsassd 28553 | . . . 4 ⊢ (𝜑 → ((𝐶 ·s 𝐵) ·s 𝐷) = (𝐶 ·s (𝐵 ·s 𝐷))) |
| 8 | 4, 6, 7 | 3eqtr3d 2804 | . . 3 ⊢ (𝜑 → (𝐵 ·s (𝐶 ·s 𝐷)) = (𝐶 ·s (𝐵 ·s 𝐷))) |
| 9 | 8 | oveq2d 7436 | . 2 ⊢ (𝜑 → (𝐴 ·s (𝐵 ·s (𝐶 ·s 𝐷))) = (𝐴 ·s (𝐶 ·s (𝐵 ·s 𝐷)))) |
| 10 | muls4d.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ No) | |
| 11 | 2, 5 | mulscld 28521 | . . 3 ⊢ (𝜑 → (𝐶 ·s 𝐷) ∈ No) |
| 12 | 10, 1, 11 | mulsassd 28553 | . 2 ⊢ (𝜑 → ((𝐴 ·s 𝐵) ·s (𝐶 ·s 𝐷)) = (𝐴 ·s (𝐵 ·s (𝐶 ·s 𝐷)))) |
| 13 | 1, 5 | mulscld 28521 | . . 3 ⊢ (𝜑 → (𝐵 ·s 𝐷) ∈ No) |
| 14 | 10, 2, 13 | mulsassd 28553 | . 2 ⊢ (𝜑 → ((𝐴 ·s 𝐶) ·s (𝐵 ·s 𝐷)) = (𝐴 ·s (𝐶 ·s (𝐵 ·s 𝐷)))) |
| 15 | 9, 12, 14 | 3eqtr4d 2806 | 1 ⊢ (𝜑 → ((𝐴 ·s 𝐵) ·s (𝐶 ·s 𝐷)) = ((𝐴 ·s 𝐶) ·s (𝐵 ·s 𝐷))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2145 (class class class)co 7420 Nocsur 27997 ·s cmuls 28492 |
| 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 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-rep 5232 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7751 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-tp 4589 df-op 4591 df-ot 4593 df-uni 4868 df-int 4908 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-se 5605 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6304 df-ord 6365 df-on 6366 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-1st 8001 df-2nd 8002 df-frecs 8299 df-wrecs 8330 df-recs 8379 df-1o 8476 df-2o 8477 df-nadd 8675 df-no 28000 df-lts 28001 df-bday 28002 df-les 28102 df-slts 28144 df-cuts 28146 df-0s 28193 df-made 28213 df-old 28214 df-left 28216 df-right 28217 df-norec 28324 df-norec2 28335 df-adds 28346 df-negs 28407 df-subs 28408 df-muls 28493 |
| This theorem is used by: divmuldivsd 28618 pw2recs 28824 |
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