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| Mirrors > Home > MPE Home > Th. List > Mathboxes > prodpr | Structured version Visualization version GIF version | ||
| Description: A product over a pair is the product of the elements. (Contributed by Thierry Arnoux, 1-Jan-2022.) |
| Ref | Expression |
|---|---|
| prodpr.1 | ⊢ (𝑘 = 𝐴 → 𝐷 = 𝐸) |
| prodpr.2 | ⊢ (𝑘 = 𝐵 → 𝐷 = 𝐹) |
| prodpr.a | ⊢ (𝜑 → 𝐴 ∈ 𝑉) |
| prodpr.b | ⊢ (𝜑 → 𝐵 ∈ 𝑊) |
| prodpr.e | ⊢ (𝜑 → 𝐸 ∈ ℂ) |
| prodpr.f | ⊢ (𝜑 → 𝐹 ∈ ℂ) |
| prodpr.3 | ⊢ (𝜑 → 𝐴 ≠ 𝐵) |
| Ref | Expression |
|---|---|
| prodpr | ⊢ (𝜑 → ∏𝑘 ∈ {𝐴, 𝐵}𝐷 = (𝐸 · 𝐹)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | prodpr.3 | . . . 4 ⊢ (𝜑 → 𝐴 ≠ 𝐵) | |
| 2 | disjsn2 4712 | . . . 4 ⊢ (𝐴 ≠ 𝐵 → ({𝐴} ∩ {𝐵}) = ∅) | |
| 3 | 1, 2 | syl 17 | . . 3 ⊢ (𝜑 → ({𝐴} ∩ {𝐵}) = ∅) |
| 4 | df-pr 4629 | . . . 4 ⊢ {𝐴, 𝐵} = ({𝐴} ∪ {𝐵}) | |
| 5 | 4 | a1i 11 | . . 3 ⊢ (𝜑 → {𝐴, 𝐵} = ({𝐴} ∪ {𝐵})) |
| 6 | prfi 9363 | . . . 4 ⊢ {𝐴, 𝐵} ∈ Fin | |
| 7 | 6 | a1i 11 | . . 3 ⊢ (𝜑 → {𝐴, 𝐵} ∈ Fin) |
| 8 | vex 3484 | . . . . 5 ⊢ 𝑘 ∈ V | |
| 9 | 8 | elpr 4650 | . . . 4 ⊢ (𝑘 ∈ {𝐴, 𝐵} ↔ (𝑘 = 𝐴 ∨ 𝑘 = 𝐵)) |
| 10 | prodpr.1 | . . . . . . 7 ⊢ (𝑘 = 𝐴 → 𝐷 = 𝐸) | |
| 11 | 10 | adantl 481 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 = 𝐴) → 𝐷 = 𝐸) |
| 12 | prodpr.e | . . . . . . 7 ⊢ (𝜑 → 𝐸 ∈ ℂ) | |
| 13 | 12 | adantr 480 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 = 𝐴) → 𝐸 ∈ ℂ) |
| 14 | 11, 13 | eqeltrd 2841 | . . . . 5 ⊢ ((𝜑 ∧ 𝑘 = 𝐴) → 𝐷 ∈ ℂ) |
| 15 | prodpr.2 | . . . . . . 7 ⊢ (𝑘 = 𝐵 → 𝐷 = 𝐹) | |
| 16 | 15 | adantl 481 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 = 𝐵) → 𝐷 = 𝐹) |
| 17 | prodpr.f | . . . . . . 7 ⊢ (𝜑 → 𝐹 ∈ ℂ) | |
| 18 | 17 | adantr 480 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 = 𝐵) → 𝐹 ∈ ℂ) |
| 19 | 16, 18 | eqeltrd 2841 | . . . . 5 ⊢ ((𝜑 ∧ 𝑘 = 𝐵) → 𝐷 ∈ ℂ) |
| 20 | 14, 19 | jaodan 960 | . . . 4 ⊢ ((𝜑 ∧ (𝑘 = 𝐴 ∨ 𝑘 = 𝐵)) → 𝐷 ∈ ℂ) |
| 21 | 9, 20 | sylan2b 594 | . . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ {𝐴, 𝐵}) → 𝐷 ∈ ℂ) |
| 22 | 3, 5, 7, 21 | fprodsplit 16002 | . 2 ⊢ (𝜑 → ∏𝑘 ∈ {𝐴, 𝐵}𝐷 = (∏𝑘 ∈ {𝐴}𝐷 · ∏𝑘 ∈ {𝐵}𝐷)) |
| 23 | prodpr.a | . . . 4 ⊢ (𝜑 → 𝐴 ∈ 𝑉) | |
| 24 | 10 | prodsn 15998 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐸 ∈ ℂ) → ∏𝑘 ∈ {𝐴}𝐷 = 𝐸) |
| 25 | 23, 12, 24 | syl2anc 584 | . . 3 ⊢ (𝜑 → ∏𝑘 ∈ {𝐴}𝐷 = 𝐸) |
| 26 | prodpr.b | . . . 4 ⊢ (𝜑 → 𝐵 ∈ 𝑊) | |
| 27 | 15 | prodsn 15998 | . . . 4 ⊢ ((𝐵 ∈ 𝑊 ∧ 𝐹 ∈ ℂ) → ∏𝑘 ∈ {𝐵}𝐷 = 𝐹) |
| 28 | 26, 17, 27 | syl2anc 584 | . . 3 ⊢ (𝜑 → ∏𝑘 ∈ {𝐵}𝐷 = 𝐹) |
| 29 | 25, 28 | oveq12d 7449 | . 2 ⊢ (𝜑 → (∏𝑘 ∈ {𝐴}𝐷 · ∏𝑘 ∈ {𝐵}𝐷) = (𝐸 · 𝐹)) |
| 30 | 22, 29 | eqtrd 2777 | 1 ⊢ (𝜑 → ∏𝑘 ∈ {𝐴, 𝐵}𝐷 = (𝐸 · 𝐹)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∨ wo 848 = wceq 1540 ∈ wcel 2108 ≠ wne 2940 ∪ cun 3949 ∩ cin 3950 ∅c0 4333 {csn 4626 {cpr 4628 (class class class)co 7431 Fincfn 8985 ℂcc 11153 · cmul 11160 ∏cprod 15939 |
| 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 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-rep 5279 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 ax-inf2 9681 ax-cnex 11211 ax-resscn 11212 ax-1cn 11213 ax-icn 11214 ax-addcl 11215 ax-addrcl 11216 ax-mulcl 11217 ax-mulrcl 11218 ax-mulcom 11219 ax-addass 11220 ax-mulass 11221 ax-distr 11222 ax-i2m1 11223 ax-1ne0 11224 ax-1rid 11225 ax-rnegex 11226 ax-rrecex 11227 ax-cnre 11228 ax-pre-lttri 11229 ax-pre-lttrn 11230 ax-pre-ltadd 11231 ax-pre-mulgt0 11232 ax-pre-sup 11233 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3380 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-int 4947 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-se 5638 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-pred 6321 df-ord 6387 df-on 6388 df-lim 6389 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-isom 6570 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-1st 8014 df-2nd 8015 df-frecs 8306 df-wrecs 8337 df-recs 8411 df-rdg 8450 df-1o 8506 df-2o 8507 df-er 8745 df-en 8986 df-dom 8987 df-sdom 8988 df-fin 8989 df-sup 9482 df-oi 9550 df-card 9979 df-pnf 11297 df-mnf 11298 df-xr 11299 df-ltxr 11300 df-le 11301 df-sub 11494 df-neg 11495 df-div 11921 df-nn 12267 df-2 12329 df-3 12330 df-n0 12527 df-z 12614 df-uz 12879 df-rp 13035 df-fz 13548 df-fzo 13695 df-seq 14043 df-exp 14103 df-hash 14370 df-cj 15138 df-re 15139 df-im 15140 df-sqrt 15274 df-abs 15275 df-clim 15524 df-prod 15940 |
| This theorem is referenced by: prodtp 32829 |
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