Theorem eigre 31582

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 6882	. . . . . 6 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → (𝑇‘𝐴) = (𝑇‘if(𝐴 ∈ ℋ, 𝐴, 0ℎ)))
2		oveq2 7410	. . . . . 6 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → (𝐵 ·ℎ 𝐴) = (𝐵 ·ℎ if(𝐴 ∈ ℋ, 𝐴, 0ℎ)))
3	1, 2	eqeq12d 2740	. . . . 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 2995	. . . . 5 ⊢ (𝐴 = if(𝐴 ∈ ℋ, 𝐴, 0ℎ) → (𝐴 ≠ 0ℎ ↔ if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ≠ 0ℎ))
5	3, 4	anbi12d 630	. . . 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 7420	. . . . . 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 7420	. . . . . 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 2740	. . . . 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 7409	. . . . . 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 2735	. . . . 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 629	. . . 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 2813	. . . . 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 30769	. . . 4 ⊢ if(𝐴 ∈ ℋ, 𝐴, 0ℎ) ∈ ℋ
19		0cn 11205	. . . . 5 ⊢ 0 ∈ ℂ
20	19	elimel 4590	. . . 4 ⊢ if(𝐵 ∈ ℂ, 𝐵, 0) ∈ ℂ
21	18, 20	eigrei 31581	. . 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 4580	. 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 1533   ∈ wcel 2098   ≠ wne 2932  ifcif 4521  ‘cfv 6534  (class class class)co 7402  ℂcc 11105  ℝcr 11106  0cc0 11107   ℋchba 30666   ·_ℎ csm 30668   ·_ih csp 30669  0_ℎc0v 30671

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2163  ax-ext 2695  ax-sep 5290  ax-nul 5297  ax-pow 5354  ax-pr 5418  ax-un 7719  ax-resscn 11164  ax-1cn 11165  ax-icn 11166  ax-addcl 11167  ax-addrcl 11168  ax-mulcl 11169  ax-mulrcl 11170  ax-mulcom 11171  ax-addass 11172  ax-mulass 11173  ax-distr 11174  ax-i2m1 11175  ax-1ne0 11176  ax-1rid 11177  ax-rnegex 11178  ax-rrecex 11179  ax-cnre 11180  ax-pre-lttri 11181  ax-pre-lttrn 11182  ax-pre-ltadd 11183  ax-pre-mulgt0 11184  ax-hv0cl 30750  ax-hfvmul 30752  ax-hfi 30826  ax-his1 30829  ax-his3 30831  ax-his4 30832

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3or 1085  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-mo 2526  df-eu 2555  df-clab 2702  df-cleq 2716  df-clel 2802  df-nfc 2877  df-ne 2933  df-nel 3039  df-ral 3054  df-rex 3063  df-rmo 3368  df-reu 3369  df-rab 3425  df-v 3468  df-sbc 3771  df-csb 3887  df-dif 3944  df-un 3946  df-in 3948  df-ss 3958  df-nul 4316  df-if 4522  df-pw 4597  df-sn 4622  df-pr 4624  df-op 4628  df-uni 4901  df-iun 4990  df-br 5140  df-opab 5202  df-mpt 5223  df-id 5565  df-po 5579  df-so 5580  df-xp 5673  df-rel 5674  df-cnv 5675  df-co 5676  df-dm 5677  df-rn 5678  df-res 5679  df-ima 5680  df-iota 6486  df-fun 6536  df-fn 6537  df-f 6538  df-f1 6539  df-fo 6540  df-f1o 6541  df-fv 6542  df-riota 7358  df-ov 7405  df-oprab 7406  df-mpo 7407  df-er 8700  df-en 8937  df-dom 8938  df-sdom 8939  df-pnf 11249  df-mnf 11250  df-xr 11251  df-ltxr 11252  df-le 11253  df-sub 11445  df-neg 11446  df-div 11871  df-2 12274  df-cj 15048  df-re 15049  df-im 15050

This theorem is referenced by:  eighmre  31710