dpjeq - Metamath Proof Explorer

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Theorem dpjeq 20015

Description: Decompose a group sum into projections. (Contributed by Mario Carneiro, 26-Apr-2016.) (Revised by AV, 14-Jul-2019.)

**Hypotheses**
Ref	Expression
dpjfval.1	⊢ (𝜑 → 𝐺dom DProd 𝑆)
dpjfval.2	⊢ (𝜑 → dom 𝑆 = 𝐼)
dpjfval.p	⊢ 𝑃 = (𝐺dProj𝑆)
dpjidcl.3	⊢ (𝜑 → 𝐴 ∈ (𝐺 DProd 𝑆))
dpjidcl.0	⊢ 0 = (0_g‘𝐺)
dpjidcl.w	⊢ 𝑊 = {ℎ ∈ X𝑖 ∈ 𝐼 (𝑆‘𝑖) ∣ ℎ finSupp 0 }
dpjeq.c	⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ 𝐶) ∈ 𝑊)

**Assertion**
Ref	Expression
dpjeq	⊢ (𝜑 → (𝐴 = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ 𝐶)) ↔ ∀𝑥 ∈ 𝐼 ((𝑃‘𝑥)‘𝐴) = 𝐶))

Distinct variable groups: 𝑥,ℎ, 0 ℎ,𝑖,𝐺,𝑥 𝑃,ℎ,𝑥 𝜑,𝑖,𝑥 𝐶,ℎ ℎ,𝐼,𝑖,𝑥 𝑥,𝑊 𝐴,ℎ,𝑥 𝑆,ℎ,𝑖,𝑥 Allowed substitution hints: 𝜑(ℎ) 𝐴(𝑖) 𝐶(𝑥,𝑖) 𝑃(𝑖) 𝑊(ℎ,𝑖) 0 (𝑖)

**Proof of Theorem dpjeq**
Step	Hyp	Ref	Expression
1		dpjfval.1	. . . . 5 ⊢ (𝜑 → 𝐺dom DProd 𝑆)
2		dpjfval.2	. . . . 5 ⊢ (𝜑 → dom 𝑆 = 𝐼)
3		dpjfval.p	. . . . 5 ⊢ 𝑃 = (𝐺dProj𝑆)
4		dpjidcl.3	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ (𝐺 DProd 𝑆))
5		dpjidcl.0	. . . . 5 ⊢ 0 = (0_g‘𝐺)
6		dpjidcl.w	. . . . 5 ⊢ 𝑊 = {ℎ ∈ X𝑖 ∈ 𝐼 (𝑆‘𝑖) ∣ ℎ finSupp 0 }
7	1, 2, 3, 4, 5, 6	dpjidcl 20014	. . . 4 ⊢ (𝜑 → ((𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)))))
8	7	simprd 495	. . 3 ⊢ (𝜑 → 𝐴 = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴))))
9	8	eqeq1d 2730	. 2 ⊢ (𝜑 → (𝐴 = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ 𝐶)) ↔ (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴))) = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ 𝐶))))
10	7	simpld 494	. . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ 𝑊)
11		dpjeq.c	. . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ 𝐶) ∈ 𝑊)
12	5, 6, 1, 2, 10, 11	dprdf11 19979	. 2 ⊢ (𝜑 → ((𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴))) = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ 𝐶)) ↔ (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) = (𝑥 ∈ 𝐼 ↦ 𝐶)))
13		fvex 6910	. . . 4 ⊢ ((𝑃‘𝑥)‘𝐴) ∈ V
14	13	rgenw 3062	. . 3 ⊢ ∀𝑥 ∈ 𝐼 ((𝑃‘𝑥)‘𝐴) ∈ V
15		mpteqb 7024	. . 3 ⊢ (∀𝑥 ∈ 𝐼 ((𝑃‘𝑥)‘𝐴) ∈ V → ((𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) = (𝑥 ∈ 𝐼 ↦ 𝐶) ↔ ∀𝑥 ∈ 𝐼 ((𝑃‘𝑥)‘𝐴) = 𝐶))
16	14, 15	mp1i 13	. 2 ⊢ (𝜑 → ((𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) = (𝑥 ∈ 𝐼 ↦ 𝐶) ↔ ∀𝑥 ∈ 𝐼 ((𝑃‘𝑥)‘𝐴) = 𝐶))
17	9, 12, 16	3bitrd 305	1 ⊢ (𝜑 → (𝐴 = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ 𝐶)) ↔ ∀𝑥 ∈ 𝐼 ((𝑃‘𝑥)‘𝐴) = 𝐶))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 = wceq 1534 ∈ wcel 2099 ∀wral 3058 {crab 3429 Vcvv 3471 class class class wbr 5148 ↦ cmpt 5231 dom cdm 5678 ‘cfv 6548 (class class class)co 7420 Xcixp 8915 finSupp cfsupp 9385 0_gc0g 17420 Σ_g cgsu 17421 DProd cdprd 19949 dProjcdpj 19950

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-cnex 11194 ax-resscn 11195 ax-1cn 11196 ax-icn 11197 ax-addcl 11198 ax-addrcl 11199 ax-mulcl 11200 ax-mulrcl 11201 ax-mulcom 11202 ax-addass 11203 ax-mulass 11204 ax-distr 11205 ax-i2m1 11206 ax-1ne0 11207 ax-1rid 11208 ax-rnegex 11209 ax-rrecex 11210 ax-cnre 11211 ax-pre-lttri 11212 ax-pre-lttrn 11213 ax-pre-ltadd 11214 ax-pre-mulgt0 11215

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3373 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-int 4950 df-iun 4998 df-iin 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-se 5634 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-isom 6557 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-of 7685 df-om 7871 df-1st 7993 df-2nd 7994 df-supp 8166 df-tpos 8231 df-frecs 8286 df-wrecs 8317 df-recs 8391 df-rdg 8430 df-1o 8486 df-er 8724 df-map 8846 df-ixp 8916 df-en 8964 df-dom 8965 df-sdom 8966 df-fin 8967 df-fsupp 9386 df-oi 9533 df-card 9962 df-pnf 11280 df-mnf 11281 df-xr 11282 df-ltxr 11283 df-le 11284 df-sub 11476 df-neg 11477 df-nn 12243 df-2 12305 df-n0 12503 df-z 12589 df-uz 12853 df-fz 13517 df-fzo 13660 df-seq 13999 df-hash 14322 df-sets 17132 df-slot 17150 df-ndx 17162 df-base 17180 df-ress 17209 df-plusg 17245 df-0g 17422 df-gsum 17423 df-mre 17565 df-mrc 17566 df-acs 17568 df-mgm 18599 df-sgrp 18678 df-mnd 18694 df-mhm 18739 df-submnd 18740 df-grp 18892 df-minusg 18893 df-sbg 18894 df-mulg 19023 df-subg 19077 df-ghm 19167 df-gim 19212 df-cntz 19267 df-oppg 19296 df-lsm 19590 df-pj1 19591 df-cmn 19736 df-dprd 19951 df-dpj 19952

This theorem is referenced by: dpjrid 20018 dchrptlem3 27198

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