Hilbert Space Explorer

Hilbert Space Explorer

< Previous Next >
Related theorems
GIF version

Theorem pjin2 5647

Description: Lemma for Theorem 1.22 of Mittelstaedt, p. 20.

**Hypotheses**
Ref	Expression
pjin1.1	⊢ G ∈ C_ℋ
pjin1.2	⊢ H ∈ C_ℋ

**Assertion**
Ref	Expression
pjin2	⊢ (((Proj ‘G) = ((Proj ‘G) ∘ (Proj ‘H)) ∧ (Proj ‘H) = ((Proj ‘H) ∘ (Proj ‘G))) ↔ (Proj ‘G) = (Proj ‘H))

**Proof of Theorem pjin2**
Step	Hyp	Ref	Expression
1		eqss 1516	. . . 4 ⊢ (G = H ↔ (G ⊆ H ∧ H ⊆ G))
2		pjin1.1	. . . . . . 7 ⊢ G ∈ C_ℋ
3		pjin1.2	. . . . . . 7 ⊢ H ∈ C_ℋ
4	2, 3	pjss2co 5634	. . . . . 6 ⊢ (G ⊆ H ↔ ((Proj ‘G) ∘ (Proj ‘H)) = (Proj ‘G))
5		cleqcom 1103	. . . . . 6 ⊢ (((Proj ‘G) ∘ (Proj ‘H)) = (Proj ‘G) ↔ (Proj ‘G) = ((Proj ‘G) ∘ (Proj ‘H)))
6	4, 5	bitr 151	. . . . 5 ⊢ (G ⊆ H ↔ (Proj ‘G) = ((Proj ‘G) ∘ (Proj ‘H)))
7	3, 2	pjss2co 5634	. . . . . 6 ⊢ (H ⊆ G ↔ ((Proj ‘H) ∘ (Proj ‘G)) = (Proj ‘H))
8		cleqcom 1103	. . . . . 6 ⊢ (((Proj ‘H) ∘ (Proj ‘G)) = (Proj ‘H) ↔ (Proj ‘H) = ((Proj ‘H) ∘ (Proj ‘G)))
9	7, 8	bitr 151	. . . . 5 ⊢ (H ⊆ G ↔ (Proj ‘H) = ((Proj ‘H) ∘ (Proj ‘G)))
10	6, 9	anbi12i 369	. . . 4 ⊢ ((G ⊆ H ∧ H ⊆ G) ↔ ((Proj ‘G) = ((Proj ‘G) ∘ (Proj ‘H)) ∧ (Proj ‘H) = ((Proj ‘H) ∘ (Proj ‘G))))
11	1, 10	bitr2 152	. . 3 ⊢ (((Proj ‘G) = ((Proj ‘G) ∘ (Proj ‘H)) ∧ (Proj ‘H) = ((Proj ‘H) ∘ (Proj ‘G))) ↔ G = H)
12		fveq2 2832	. . 3 ⊢ (G = H → (Proj ‘G) = (Proj ‘H))
13	11, 12	sylbi 174	. 2 ⊢ (((Proj ‘G) = ((Proj ‘G) ∘ (Proj ‘H)) ∧ (Proj ‘H) = ((Proj ‘H) ∘ (Proj ‘G))) → (Proj ‘G) = (Proj ‘H))
14		coeq2 2503	. . . 4 ⊢ ((Proj ‘G) = (Proj ‘H) → ((Proj ‘G) ∘ (Proj ‘G)) = ((Proj ‘G) ∘ (Proj ‘H)))
15	2	pjidmco 5642	. . . 4 ⊢ ((Proj ‘G) ∘ (Proj ‘G)) = (Proj ‘G)
16	14, 15	syl5eqr 1138	. . 3 ⊢ ((Proj ‘G) = (Proj ‘H) → (Proj ‘G) = ((Proj ‘G) ∘ (Proj ‘H)))
17		coeq2 2503	. . . 4 ⊢ ((Proj ‘G) = (Proj ‘H) → ((Proj ‘H) ∘ (Proj ‘G)) = ((Proj ‘H) ∘ (Proj ‘H)))
18	3	pjidmco 5642	. . . 4 ⊢ ((Proj ‘H) ∘ (Proj ‘H)) = (Proj ‘H)
19	17, 18	syl6req 1141	. . 3 ⊢ ((Proj ‘G) = (Proj ‘H) → (Proj ‘H) = ((Proj ‘H) ∘ (Proj ‘G)))
20	16, 19	jca 236	. 2 ⊢ ((Proj ‘G) = (Proj ‘H) → ((Proj ‘G) = ((Proj ‘G) ∘ (Proj ‘H)) ∧ (Proj ‘H) = ((Proj ‘H) ∘ (Proj ‘G))))
21	13, 20	impbi 139	1 ⊢ (((Proj ‘G) = ((Proj ‘G) ∘ (Proj ‘H)) ∧ (Proj ‘H) = ((Proj ‘H) ∘ (Proj ‘G))) ↔ (Proj ‘G) = (Proj ‘H))

Colors of variables: wff set class

Syntax hints: ↔ wb 127 ∧ wa 196 = wceq 1091 ∈ wcel 1092 ⊆ wss 1487 ∘ ccom 2414 ‘cfv 2422 C_ℋ cch 4968 Projcpj 4976

This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-un 1076 ax-pow 1077 ax-reg 1078 ax-inf 1079 ax-ac 1080 ax-hilex 4983 ax-hvaddcl 4984 ax-hvcom 4985 ax-hvass 4986 ax-hvzercl 4987 ax-hvaddid 4988 ax-hvmulcl 4989 ax-hvmulid 4991 ax-hvmulass 4992 ax-hvdistr1 4993 ax-hvdistr2 4994 ax-hvmulzer 4995 ax-hicl 5043 ax-his1 5045 ax-his2 5046 ax-his3 5047 ax-his4 5048 ax-hcompl 5113

This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-3or 582 df-3an 583 df-ex 679 df-sb 853 df-eu 1009 df-mo 1010 df-clab 1093 df-cleq 1097 df-clel 1099 df-ne 1192 df-ral 1205 df-rex 1206 df-reu 1207 df-rab 1208 df-v 1349 df-sbc 1441 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-pss 1494 df-nul 1708 df-if 1777 df-pw 1799 df-sn 1811 df-pr 1812 df-tp 1814 df-op 1815 df-uni 1920 df-int 1966 df-iun 1996 df-tr 2042 df-br 2063 df-opab 2098 df-eprel 2122 df-id 2125 df-po 2128 df-so 2138 df-sup 2154 df-fr 2169 df-we 2186 df-ord 2202 df-on 2203 df-lim 2204 df-suc 2205 df-om 2373 df-xp 2424 df-rel 2425 df-cnv 2426 df-co 2427 df-dm 2428 df-rn 2429 df-res 2430 df-ima 2431 df-fun 2432 df-fn 2433 df-f 2434 df-f1 2435 df-fo 2436 df-f1o 2437 df-fv 2438 df-rdg 2970 df-opr 3003 df-oprab 3004 df-1st 3087 df-2nd 3088 df-1o 3104 df-oadd 3106 df-omul 3107 df-er 3200 df-ec 3202 df-qs 3205 df-ni 3794 df-pli 3795 df-mi 3796 df-lti 3797 df-plpq 3829 df-mpq 3830 df-enq 3831 df-nq 3832 df-plq 3833 df-mq 3834 df-rq 3835 df-ltq 3836 df-1q 3837 df-np 3880 df-1p 3881 df-plp 3882 df-mp 3883 df-ltp 3884 df-plpr 3958 df-mpr 3959 df-enr 3960 df-nr 3961 df-plr 3962 df-mr 3963 df-ltr 3964 df-0r 3965 df-1r 3966 df-m1r 3967 df-c 4034 df-0 4035 df-1 4036 df-i 4037 df-r 4038 df-plus 4039 df-mul 4040 df-lt 4041 df-sub 4133 df-neg 4135 df-div 4216 df-le 4277 df-n 4423 df-2 4462 df-3 4463 df-4 4464 df-n0 4535 df-z 4564 df-seq 4661 df-exp 4676 df-sqr 4728 df-re 4790 df-im 4791 df-cj 4792 df-abs 4793 df-clim 4876 df-hvsub 4996 df-hnorm 5074 df-cauchy 5102 df-hlim 5107 df-sh 5114 df-ch 5127 df-oc 5156 df-ch0 5157 df-pj 5244

metamath.org