Theorem eigre 31644

Description: A necessary and sufficient condition (that holds when 𝑇 is a Hermitian operator) for an eigenvalue 𝐵 to be real. Generalization of Equation 1.30 of [Hughes] p. 49. (Contributed by NM, 19-Mar-2006.) (New usage is discouraged.)

Assertion

Ref	Expression
eigre	⊢ (((𝐴 ∈ ℋ ∧ 𝐵 ∈ ℂ) ∧ ((𝑇‘𝐴) = (𝐵 ·ℎ 𝐴) ∧ 𝐴 ≠ 0ℎ)) → ((𝐴 ·ih (𝑇‘𝐴)) = ((𝑇‘𝐴) ·ih 𝐴) ↔ 𝐵 ∈ ℝ))

Proof of Theorem eigre

Step	Hyp	Ref	Expression
1		fveq2 6897	. . . . . 6 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → (𝑇‘𝐴) = (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)))
2		oveq2 7428	. . . . . 6 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → (𝐵 ·ℎ 𝐴) = (𝐵 ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)))
3	1, 2	eqeq12d 2744	. . . . 5 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → ((𝑇‘𝐴) = (𝐵 ·ℎ 𝐴) ↔ (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) = (𝐵 ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ))))
4		neeq1 3000	. . . . 5 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → (𝐴 ≠ 0ℎ ↔ if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ≠ 0ℎ))
5	3, 4	anbi12d 631	. . . 4 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → (((𝑇‘𝐴) = (𝐵 ·ℎ 𝐴) ∧ 𝐴 ≠ 0ℎ) ↔ ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) = (𝐵 ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ∧ if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ≠ 0ℎ)))
6		id 22	. . . . . . 7 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → 𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ))
7	6, 1	oveq12d 7438	. . . . . 6 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → (𝐴 ·ih (𝑇‘𝐴)) = (if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ·ih (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ))))
8	1, 6	oveq12d 7438	. . . . . 6 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → ((𝑇‘𝐴) ·ih 𝐴) = ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ·ih if(𝐴 ∈ ℋ, 𝐴, 0ℎ)))
9	7, 8	eqeq12d 2744	. . . . 5 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → ((𝐴 ·ih (𝑇‘𝐴)) = ((𝑇‘𝐴) ·ih 𝐴) ↔ (if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ·ih (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ))) = ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ·ih if(𝐴 ∈ ℋ, 𝐴, 0ℎ))))
10	9	bibi1d 343	. . . 4 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → (((𝐴 ·ih (𝑇‘𝐴)) = ((𝑇‘𝐴) ·ih 𝐴) ↔ 𝐵 ∈ ℝ) ↔ ((if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ·ih (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ))) = ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ·ih if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ↔ 𝐵 ∈ ℝ)))
11	5, 10	imbi12d 344	. . 3 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → ((((𝑇‘𝐴) = (𝐵 ·ℎ 𝐴) ∧ 𝐴 ≠ 0ℎ) → ((𝐴 ·ih (𝑇‘𝐴)) = ((𝑇‘𝐴) ·ih 𝐴) ↔ 𝐵 ∈ ℝ)) ↔ (((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) = (𝐵 ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ∧ if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ≠ 0ℎ) → ((if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ·ih (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ))) = ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ·ih if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ↔ 𝐵 ∈ ℝ))))
12		oveq1 7427	. . . . . 6 ⊢ (𝐵 = if(𝐵 ∈ ℂ, 𝐵, 0) → (𝐵 ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) = (if(𝐵 ∈ ℂ, 𝐵, 0) ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)))
13	12	eqeq2d 2739	. . . . 5 ⊢ (𝐵 = if(𝐵 ∈ ℂ, 𝐵, 0) → ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) = (𝐵 ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ↔ (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) = (if(𝐵 ∈ ℂ, 𝐵, 0) ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ))))
14	13	anbi1d 630	. . . 4 ⊢ (𝐵 = if(𝐵 ∈ ℂ, 𝐵, 0) → (((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) = (𝐵 ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ∧ if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ≠ 0ℎ) ↔ ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) = (if(𝐵 ∈ ℂ, 𝐵, 0) ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ∧ if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ≠ 0ℎ)))
15		eleq1 2817	. . . . 5 ⊢ (𝐵 = if(𝐵 ∈ ℂ, 𝐵, 0) → (𝐵 ∈ ℝ ↔ if(𝐵 ∈ ℂ, 𝐵, 0) ∈ ℝ))
16	15	bibi2d 342	. . . 4 ⊢ (𝐵 = if(𝐵 ∈ ℂ, 𝐵, 0) → (((if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ·ih (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ))) = ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ·ih if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ↔ 𝐵 ∈ ℝ) ↔ ((if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ·ih (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ))) = ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ·ih if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ↔ if(𝐵 ∈ ℂ, 𝐵, 0) ∈ ℝ)))
17	14, 16	imbi12d 344	. . 3 ⊢ (𝐵 = if(𝐵 ∈ ℂ, 𝐵, 0) → ((((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) = (𝐵 ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ∧ if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ≠ 0ℎ) → ((if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ·ih (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ))) = ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ·ih if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ↔ 𝐵 ∈ ℝ)) ↔ (((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) = (if(𝐵 ∈ ℂ, 𝐵, 0) ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ∧ if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ≠ 0ℎ) → ((if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ·ih (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ))) = ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ·ih if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ↔ if(𝐵 ∈ ℂ, 𝐵, 0) ∈ ℝ))))
18		ifhvhv0 30831	. . . 4 ⊢ if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ∈ ℋ
19		0cn 11236	. . . . 5 ⊢ 0 ∈ ℂ
20	19	elimel 4598	. . . 4 ⊢ if(𝐵 ∈ ℂ, 𝐵, 0) ∈ ℂ
21	18, 20	eigrei 31643	. . 3 ⊢ (((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) = (if(𝐵 ∈ ℂ, 𝐵, 0) ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ∧ if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ≠ 0ℎ) → ((if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ·ih (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ))) = ((𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ·ih if(𝐴 ∈ ℋ, 𝐴, 0ℎ)) ↔ if(𝐵 ∈ ℂ, 𝐵, 0) ∈ ℝ))
22	11, 17, 21	dedth2h 4588	. 2 ⊢ ((𝐴 ∈ ℋ ∧ 𝐵 ∈ ℂ) → (((𝑇‘𝐴) = (𝐵 ·ℎ 𝐴) ∧ 𝐴 ≠ 0ℎ) → ((𝐴 ·ih (𝑇‘𝐴)) = ((𝑇‘𝐴) ·ih 𝐴) ↔ 𝐵 ∈ ℝ)))
23	22	imp 406	1 ⊢ (((𝐴 ∈ ℋ ∧ 𝐵 ∈ ℂ) ∧ ((𝑇‘𝐴) = (𝐵 ·ℎ 𝐴) ∧ 𝐴 ≠ 0ℎ)) → ((𝐴 ·ih (𝑇‘𝐴)) = ((𝑇‘𝐴) ·ih 𝐴) ↔ 𝐵 ∈ ℝ))

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 395   = wceq 1534   ∈ wcel 2099   ≠ wne 2937  ifcif 4529  ‘cfv 6548  (class class class)co 7420  ℂcc 11136  ℝcr 11137  0cc0 11138   ℋchba 30728   ·_ℎ csm 30730   ·_ih csp 30731  0_ℎc0v 30733

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-sep 5299  ax-nul 5306  ax-pow 5365  ax-pr 5429  ax-un 7740  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  ax-hv0cl 30812  ax-hfvmul 30814  ax-hfi 30888  ax-his1 30891  ax-his3 30893  ax-his4 30894

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-nul 4324  df-if 4530  df-pw 4605  df-sn 4630  df-pr 4632  df-op 4636  df-uni 4909  df-iun 4998  df-br 5149  df-opab 5211  df-mpt 5232  df-id 5576  df-po 5590  df-so 5591  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-iota 6500  df-fun 6550  df-fn 6551  df-f 6552  df-f1 6553  df-fo 6554  df-f1o 6555  df-fv 6556  df-riota 7376  df-ov 7423  df-oprab 7424  df-mpo 7425  df-er 8724  df-en 8964  df-dom 8965  df-sdom 8966  df-pnf 11280  df-mnf 11281  df-xr 11282  df-ltxr 11283  df-le 11284  df-sub 11476  df-neg 11477  df-div 11902  df-2 12305  df-cj 15078  df-re 15079  df-im 15080

This theorem is referenced by:  eighmre  31772