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Mirrors > Home > MPE Home > Th. List > pj1eq | Structured version Visualization version GIF version |
Description: Any element of a direct subspace sum can be decomposed uniquely into projections onto the left and right factors. (Contributed by Mario Carneiro, 16-Oct-2015.) |
Ref | Expression |
---|---|
pj1eu.a | ⊢ + = (+g‘𝐺) |
pj1eu.s | ⊢ ⊕ = (LSSum‘𝐺) |
pj1eu.o | ⊢ 0 = (0g‘𝐺) |
pj1eu.z | ⊢ 𝑍 = (Cntz‘𝐺) |
pj1eu.2 | ⊢ (𝜑 → 𝑇 ∈ (SubGrp‘𝐺)) |
pj1eu.3 | ⊢ (𝜑 → 𝑈 ∈ (SubGrp‘𝐺)) |
pj1eu.4 | ⊢ (𝜑 → (𝑇 ∩ 𝑈) = { 0 }) |
pj1eu.5 | ⊢ (𝜑 → 𝑇 ⊆ (𝑍‘𝑈)) |
pj1f.p | ⊢ 𝑃 = (proj1‘𝐺) |
pj1eq.5 | ⊢ (𝜑 → 𝑋 ∈ (𝑇 ⊕ 𝑈)) |
pj1eq.6 | ⊢ (𝜑 → 𝐵 ∈ 𝑇) |
pj1eq.7 | ⊢ (𝜑 → 𝐶 ∈ 𝑈) |
Ref | Expression |
---|---|
pj1eq | ⊢ (𝜑 → (𝑋 = (𝐵 + 𝐶) ↔ (((𝑇𝑃𝑈)‘𝑋) = 𝐵 ∧ ((𝑈𝑃𝑇)‘𝑋) = 𝐶))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pj1eq.5 | . . . 4 ⊢ (𝜑 → 𝑋 ∈ (𝑇 ⊕ 𝑈)) | |
2 | pj1eu.a | . . . . 5 ⊢ + = (+g‘𝐺) | |
3 | pj1eu.s | . . . . 5 ⊢ ⊕ = (LSSum‘𝐺) | |
4 | pj1eu.o | . . . . 5 ⊢ 0 = (0g‘𝐺) | |
5 | pj1eu.z | . . . . 5 ⊢ 𝑍 = (Cntz‘𝐺) | |
6 | pj1eu.2 | . . . . 5 ⊢ (𝜑 → 𝑇 ∈ (SubGrp‘𝐺)) | |
7 | pj1eu.3 | . . . . 5 ⊢ (𝜑 → 𝑈 ∈ (SubGrp‘𝐺)) | |
8 | pj1eu.4 | . . . . 5 ⊢ (𝜑 → (𝑇 ∩ 𝑈) = { 0 }) | |
9 | pj1eu.5 | . . . . 5 ⊢ (𝜑 → 𝑇 ⊆ (𝑍‘𝑈)) | |
10 | pj1f.p | . . . . 5 ⊢ 𝑃 = (proj1‘𝐺) | |
11 | 2, 3, 4, 5, 6, 7, 8, 9, 10 | pj1id 17935 | . . . 4 ⊢ ((𝜑 ∧ 𝑋 ∈ (𝑇 ⊕ 𝑈)) → 𝑋 = (((𝑇𝑃𝑈)‘𝑋) + ((𝑈𝑃𝑇)‘𝑋))) |
12 | 1, 11 | mpdan 699 | . . 3 ⊢ (𝜑 → 𝑋 = (((𝑇𝑃𝑈)‘𝑋) + ((𝑈𝑃𝑇)‘𝑋))) |
13 | 12 | eqeq1d 2612 | . 2 ⊢ (𝜑 → (𝑋 = (𝐵 + 𝐶) ↔ (((𝑇𝑃𝑈)‘𝑋) + ((𝑈𝑃𝑇)‘𝑋)) = (𝐵 + 𝐶))) |
14 | 2, 3, 4, 5, 6, 7, 8, 9, 10 | pj1f 17933 | . . . 4 ⊢ (𝜑 → (𝑇𝑃𝑈):(𝑇 ⊕ 𝑈)⟶𝑇) |
15 | 14, 1 | ffvelrnd 6268 | . . 3 ⊢ (𝜑 → ((𝑇𝑃𝑈)‘𝑋) ∈ 𝑇) |
16 | pj1eq.6 | . . 3 ⊢ (𝜑 → 𝐵 ∈ 𝑇) | |
17 | 2, 3, 4, 5, 6, 7, 8, 9, 10 | pj2f 17934 | . . . 4 ⊢ (𝜑 → (𝑈𝑃𝑇):(𝑇 ⊕ 𝑈)⟶𝑈) |
18 | 17, 1 | ffvelrnd 6268 | . . 3 ⊢ (𝜑 → ((𝑈𝑃𝑇)‘𝑋) ∈ 𝑈) |
19 | pj1eq.7 | . . 3 ⊢ (𝜑 → 𝐶 ∈ 𝑈) | |
20 | 2, 4, 5, 6, 7, 8, 9, 15, 16, 18, 19 | subgdisjb 17929 | . 2 ⊢ (𝜑 → ((((𝑇𝑃𝑈)‘𝑋) + ((𝑈𝑃𝑇)‘𝑋)) = (𝐵 + 𝐶) ↔ (((𝑇𝑃𝑈)‘𝑋) = 𝐵 ∧ ((𝑈𝑃𝑇)‘𝑋) = 𝐶))) |
21 | 13, 20 | bitrd 267 | 1 ⊢ (𝜑 → (𝑋 = (𝐵 + 𝐶) ↔ (((𝑇𝑃𝑈)‘𝑋) = 𝐵 ∧ ((𝑈𝑃𝑇)‘𝑋) = 𝐶))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 = wceq 1475 ∈ wcel 1977 ∩ cin 3539 ⊆ wss 3540 {csn 4125 ‘cfv 5804 (class class class)co 6549 +gcplusg 15768 0gc0g 15923 SubGrpcsubg 17411 Cntzccntz 17571 LSSumclsm 17872 proj1cpj1 17873 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-rep 4699 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-cnex 9871 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 ax-pre-mulgt0 9892 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rmo 2904 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-iun 4457 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-om 6958 df-1st 7059 df-2nd 7060 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-er 7629 df-en 7842 df-dom 7843 df-sdom 7844 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-nn 10898 df-2 10956 df-ndx 15698 df-slot 15699 df-base 15700 df-sets 15701 df-ress 15702 df-plusg 15781 df-0g 15925 df-mgm 17065 df-sgrp 17107 df-mnd 17118 df-grp 17248 df-minusg 17249 df-sbg 17250 df-subg 17414 df-cntz 17573 df-lsm 17874 df-pj1 17875 |
This theorem is referenced by: pj1lid 17937 pj1rid 17938 pj1ghm 17939 lsmhash 17941 dpjidcl 18280 pj1lmhm 18921 |
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