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Theorem List for Metamath Proof Explorer - 29001-29100   *Has distinct variable group(s)
TypeLabelDescription
Statement

Theoremnmopun 29001 Norm of a unitary Hilbert space operator. (Contributed by NM, 25-Feb-2006.) (New usage is discouraged.)
(( ℋ ≠ 0𝑇 ∈ UniOp) → (normop𝑇) = 1)

Theoremunopbd 29002 A unitary operator is a bounded linear operator. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
(𝑇 ∈ UniOp → 𝑇 ∈ BndLinOp)

Theoremlnophmlem1 29003* Lemma for lnophmi 29005. (Contributed by NM, 24-Jan-2006.) (New usage is discouraged.)
𝐴 ∈ ℋ    &   𝐵 ∈ ℋ    &   𝑇 ∈ LinOp    &   𝑥 ∈ ℋ (𝑥 ·ih (𝑇𝑥)) ∈ ℝ       (𝐴 ·ih (𝑇𝐴)) ∈ ℝ

Theoremlnophmlem2 29004* Lemma for lnophmi 29005. (Contributed by NM, 24-Jan-2006.) (New usage is discouraged.)
𝐴 ∈ ℋ    &   𝐵 ∈ ℋ    &   𝑇 ∈ LinOp    &   𝑥 ∈ ℋ (𝑥 ·ih (𝑇𝑥)) ∈ ℝ       (𝐴 ·ih (𝑇𝐵)) = ((𝑇𝐴) ·ih 𝐵)

Theoremlnophmi 29005* A linear operator is Hermitian if 𝑥 ·ih (𝑇𝑥) takes only real values. Remark in [ReedSimon] p. 195. (Contributed by NM, 24-Jan-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑥 ∈ ℋ (𝑥 ·ih (𝑇𝑥)) ∈ ℝ       𝑇 ∈ HrmOp

Theoremlnophm 29006* A linear operator is Hermitian if 𝑥 ·ih (𝑇𝑥) takes only real values. Remark in [ReedSimon] p. 195. (Contributed by NM, 24-Jan-2006.) (New usage is discouraged.)
((𝑇 ∈ LinOp ∧ ∀𝑥 ∈ ℋ (𝑥 ·ih (𝑇𝑥)) ∈ ℝ) → 𝑇 ∈ HrmOp)

Theoremhmops 29007 The sum of two Hermitian operators is Hermitian. (Contributed by NM, 23-Jul-2006.) (New usage is discouraged.)
((𝑇 ∈ HrmOp ∧ 𝑈 ∈ HrmOp) → (𝑇 +op 𝑈) ∈ HrmOp)

Theoremhmopm 29008 The scalar product of a Hermitian operator with a real is Hermitian. (Contributed by NM, 23-Jul-2006.) (New usage is discouraged.)
((𝐴 ∈ ℝ ∧ 𝑇 ∈ HrmOp) → (𝐴 ·op 𝑇) ∈ HrmOp)

Theoremhmopd 29009 The difference of two Hermitian operators is Hermitian. (Contributed by NM, 23-Jul-2006.) (New usage is discouraged.)
((𝑇 ∈ HrmOp ∧ 𝑈 ∈ HrmOp) → (𝑇op 𝑈) ∈ HrmOp)

Theoremhmopco 29010 The composition of two commuting Hermitian operators is Hermitian. (Contributed by NM, 22-Aug-2006.) (New usage is discouraged.)
((𝑇 ∈ HrmOp ∧ 𝑈 ∈ HrmOp ∧ (𝑇𝑈) = (𝑈𝑇)) → (𝑇𝑈) ∈ HrmOp)

Theoremnmbdoplbi 29011 A lower bound for the norm of a bounded linear operator. (Contributed by NM, 14-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ BndLinOp       (𝐴 ∈ ℋ → (norm‘(𝑇𝐴)) ≤ ((normop𝑇) · (norm𝐴)))

Theoremnmbdoplb 29012 A lower bound for the norm of a bounded linear Hilbert space operator. (Contributed by NM, 18-Feb-2006.) (New usage is discouraged.)
((𝑇 ∈ BndLinOp ∧ 𝐴 ∈ ℋ) → (norm‘(𝑇𝐴)) ≤ ((normop𝑇) · (norm𝐴)))

Theoremnmcexi 29013* Lemma for nmcopexi 29014 and nmcfnexi 29038. The norm of a continuous linear Hilbert space operator or functional exists. Theorem 3.5(i) of [Beran] p. 99. (Contributed by Mario Carneiro, 17-Nov-2013.) (Proof shortened by Mario Carneiro, 23-Dec-2013.) (New usage is discouraged.)
𝑦 ∈ ℝ+𝑧 ∈ ℋ ((norm𝑧) < 𝑦 → (𝑁‘(𝑇𝑧)) < 1)    &   (𝑆𝑇) = sup({𝑚 ∣ ∃𝑥 ∈ ℋ ((norm𝑥) ≤ 1 ∧ 𝑚 = (𝑁‘(𝑇𝑥)))}, ℝ*, < )    &   (𝑥 ∈ ℋ → (𝑁‘(𝑇𝑥)) ∈ ℝ)    &   (𝑁‘(𝑇‘0)) = 0    &   (((𝑦 / 2) ∈ ℝ+𝑥 ∈ ℋ) → ((𝑦 / 2) · (𝑁‘(𝑇𝑥))) = (𝑁‘(𝑇‘((𝑦 / 2) · 𝑥))))       (𝑆𝑇) ∈ ℝ

Theoremnmcopexi 29014 The norm of a continuous linear Hilbert space operator exists. Theorem 3.5(i) of [Beran] p. 99. (Contributed by NM, 5-Feb-2006.) (Proof shortened by Mario Carneiro, 17-Nov-2013.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp       (normop𝑇) ∈ ℝ

Theoremnmcoplbi 29015 A lower bound for the norm of a continuous linear operator. Theorem 3.5(ii) of [Beran] p. 99. (Contributed by NM, 7-Feb-2006.) (Revised by Mario Carneiro, 17-Nov-2013.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp       (𝐴 ∈ ℋ → (norm‘(𝑇𝐴)) ≤ ((normop𝑇) · (norm𝐴)))

Theoremnmcopex 29016 The norm of a continuous linear Hilbert space operator exists. Theorem 3.5(i) of [Beran] p. 99. (Contributed by NM, 7-Feb-2006.) (New usage is discouraged.)
((𝑇 ∈ LinOp ∧ 𝑇 ∈ ContOp) → (normop𝑇) ∈ ℝ)

Theoremnmcoplb 29017 A lower bound for the norm of a continuous linear Hilbert space operator. Theorem 3.5(ii) of [Beran] p. 99. (Contributed by NM, 7-Feb-2006.) (New usage is discouraged.)
((𝑇 ∈ LinOp ∧ 𝑇 ∈ ContOp ∧ 𝐴 ∈ ℋ) → (norm‘(𝑇𝐴)) ≤ ((normop𝑇) · (norm𝐴)))

Theoremnmophmi 29018 The norm of the scalar product of a bounded linear operator. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑇 ∈ BndLinOp       (𝐴 ∈ ℂ → (normop‘(𝐴 ·op 𝑇)) = ((abs‘𝐴) · (normop𝑇)))

Theorembdophmi 29019 The scalar product of a bounded linear operator is a bounded linear operator. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑇 ∈ BndLinOp       (𝐴 ∈ ℂ → (𝐴 ·op 𝑇) ∈ BndLinOp)

Theoremlnconi 29020* Lemma for lnopconi 29021 and lnfnconi 29042. (Contributed by NM, 7-Feb-2006.) (New usage is discouraged.)
(𝑇𝐶𝑆 ∈ ℝ)    &   ((𝑇𝐶𝑦 ∈ ℋ) → (𝑁‘(𝑇𝑦)) ≤ (𝑆 · (norm𝑦)))    &   (𝑇𝐶 ↔ ∀𝑥 ∈ ℋ ∀𝑧 ∈ ℝ+𝑦 ∈ ℝ+𝑤 ∈ ℋ ((norm‘(𝑤 𝑥)) < 𝑦 → (𝑁‘((𝑇𝑤)𝑀(𝑇𝑥))) < 𝑧))    &   (𝑦 ∈ ℋ → (𝑁‘(𝑇𝑦)) ∈ ℝ)    &   ((𝑤 ∈ ℋ ∧ 𝑥 ∈ ℋ) → (𝑇‘(𝑤 𝑥)) = ((𝑇𝑤)𝑀(𝑇𝑥)))       (𝑇𝐶 ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (𝑁‘(𝑇𝑦)) ≤ (𝑥 · (norm𝑦)))

Theoremlnopconi 29021* A condition equivalent to "𝑇 is continuous" when 𝑇 is linear. Theorem 3.5(iii) of [Beran] p. 99. (Contributed by NM, 7-Feb-2006.) (Proof shortened by Mario Carneiro, 17-Nov-2013.) (New usage is discouraged.)
𝑇 ∈ LinOp       (𝑇 ∈ ContOp ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (norm‘(𝑇𝑦)) ≤ (𝑥 · (norm𝑦)))

Theoremlnopcon 29022* A condition equivalent to "𝑇 is continuous" when 𝑇 is linear. Theorem 3.5(iii) of [Beran] p. 99. (Contributed by NM, 14-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ LinOp → (𝑇 ∈ ContOp ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (norm‘(𝑇𝑦)) ≤ (𝑥 · (norm𝑦))))

Theoremlnopcnbd 29023 A linear operator is continuous iff it is bounded. (Contributed by NM, 14-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ LinOp → (𝑇 ∈ ContOp ↔ 𝑇 ∈ BndLinOp))

Theoremlncnopbd 29024 A continuous linear operator is a bounded linear operator. This theorem justifies our use of "bounded linear" as an interchangeable condition for "continuous linear" used in some textbook proofs. (Contributed by NM, 18-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ (LinOp ∩ ContOp) ↔ 𝑇 ∈ BndLinOp)

Theoremlncnbd 29025 A continuous linear operator is a bounded linear operator. (Contributed by NM, 18-Feb-2006.) (New usage is discouraged.)
(LinOp ∩ ContOp) = BndLinOp

Theoremlnopcnre 29026 A linear operator is continuous iff it is bounded. (Contributed by NM, 14-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ LinOp → (𝑇 ∈ ContOp ↔ (normop𝑇) ∈ ℝ))

Theoremlnfnli 29027 Basic property of a linear Hilbert space functional. (Contributed by NM, 11-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinFn       ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℋ ∧ 𝐶 ∈ ℋ) → (𝑇‘((𝐴 · 𝐵) + 𝐶)) = ((𝐴 · (𝑇𝐵)) + (𝑇𝐶)))

Theoremlnfnfi 29028 A linear Hilbert space functional is a functional. (Contributed by NM, 11-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinFn       𝑇: ℋ⟶ℂ

Theoremlnfn0i 29029 The value of a linear Hilbert space functional at zero is zero. Remark in [Beran] p. 99. (Contributed by NM, 11-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinFn       (𝑇‘0) = 0

Theoremlnfnaddi 29030 Additive property of a linear Hilbert space functional. (Contributed by NM, 11-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinFn       ((𝐴 ∈ ℋ ∧ 𝐵 ∈ ℋ) → (𝑇‘(𝐴 + 𝐵)) = ((𝑇𝐴) + (𝑇𝐵)))

Theoremlnfnmuli 29031 Multiplicative property of a linear Hilbert space functional. (Contributed by NM, 11-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinFn       ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℋ) → (𝑇‘(𝐴 · 𝐵)) = (𝐴 · (𝑇𝐵)))

Theoremlnfnaddmuli 29032 Sum/product property of a linear Hilbert space functional. (Contributed by NM, 13-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinFn       ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℋ ∧ 𝐶 ∈ ℋ) → (𝑇‘(𝐵 + (𝐴 · 𝐶))) = ((𝑇𝐵) + (𝐴 · (𝑇𝐶))))

Theoremlnfnsubi 29033 Subtraction property for a linear Hilbert space functional. (Contributed by NM, 13-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinFn       ((𝐴 ∈ ℋ ∧ 𝐵 ∈ ℋ) → (𝑇‘(𝐴 𝐵)) = ((𝑇𝐴) − (𝑇𝐵)))

Theoremlnfn0 29034 The value of a linear Hilbert space functional at zero is zero. Remark in [Beran] p. 99. (Contributed by NM, 25-Apr-2006.) (New usage is discouraged.)
(𝑇 ∈ LinFn → (𝑇‘0) = 0)

Theoremlnfnmul 29035 Multiplicative property of a linear Hilbert space functional. (Contributed by NM, 30-May-2006.) (New usage is discouraged.)
((𝑇 ∈ LinFn ∧ 𝐴 ∈ ℂ ∧ 𝐵 ∈ ℋ) → (𝑇‘(𝐴 · 𝐵)) = (𝐴 · (𝑇𝐵)))

Theoremnmbdfnlbi 29036 A lower bound for the norm of a bounded linear functional. (Contributed by NM, 25-Apr-2006.) (New usage is discouraged.)
(𝑇 ∈ LinFn ∧ (normfn𝑇) ∈ ℝ)       (𝐴 ∈ ℋ → (abs‘(𝑇𝐴)) ≤ ((normfn𝑇) · (norm𝐴)))

Theoremnmbdfnlb 29037 A lower bound for the norm of a bounded linear functional. (Contributed by NM, 25-Apr-2006.) (New usage is discouraged.)
((𝑇 ∈ LinFn ∧ (normfn𝑇) ∈ ℝ ∧ 𝐴 ∈ ℋ) → (abs‘(𝑇𝐴)) ≤ ((normfn𝑇) · (norm𝐴)))

Theoremnmcfnexi 29038 The norm of a continuous linear Hilbert space functional exists. Theorem 3.5(i) of [Beran] p. 99. (Contributed by NM, 14-Feb-2006.) (Proof shortened by Mario Carneiro, 17-Nov-2013.) (New usage is discouraged.)
𝑇 ∈ LinFn    &   𝑇 ∈ ContFn       (normfn𝑇) ∈ ℝ

Theoremnmcfnlbi 29039 A lower bound for the norm of a continuous linear functional. Theorem 3.5(ii) of [Beran] p. 99. (Contributed by NM, 14-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinFn    &   𝑇 ∈ ContFn       (𝐴 ∈ ℋ → (abs‘(𝑇𝐴)) ≤ ((normfn𝑇) · (norm𝐴)))

Theoremnmcfnex 29040 The norm of a continuous linear Hilbert space functional exists. Theorem 3.5(i) of [Beran] p. 99. (Contributed by NM, 14-Feb-2006.) (New usage is discouraged.)
((𝑇 ∈ LinFn ∧ 𝑇 ∈ ContFn) → (normfn𝑇) ∈ ℝ)

Theoremnmcfnlb 29041 A lower bound of the norm of a continuous linear Hilbert space functional. Theorem 3.5(ii) of [Beran] p. 99. (Contributed by NM, 14-Feb-2006.) (New usage is discouraged.)
((𝑇 ∈ LinFn ∧ 𝑇 ∈ ContFn ∧ 𝐴 ∈ ℋ) → (abs‘(𝑇𝐴)) ≤ ((normfn𝑇) · (norm𝐴)))

Theoremlnfnconi 29042* A condition equivalent to "𝑇 is continuous" when 𝑇 is linear. Theorem 3.5(iii) of [Beran] p. 99. (Contributed by NM, 14-Feb-2006.) (Proof shortened by Mario Carneiro, 17-Nov-2013.) (New usage is discouraged.)
𝑇 ∈ LinFn       (𝑇 ∈ ContFn ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇𝑦)) ≤ (𝑥 · (norm𝑦)))

Theoremlnfncon 29043* A condition equivalent to "𝑇 is continuous" when 𝑇 is linear. Theorem 3.5(iii) of [Beran] p. 99. (Contributed by NM, 16-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ LinFn → (𝑇 ∈ ContFn ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇𝑦)) ≤ (𝑥 · (norm𝑦))))

Theoremlnfncnbd 29044 A linear functional is continuous iff it is bounded. (Contributed by NM, 25-Apr-2006.) (New usage is discouraged.)
(𝑇 ∈ LinFn → (𝑇 ∈ ContFn ↔ (normfn𝑇) ∈ ℝ))

Theoremimaelshi 29045 The image of a subspace under a linear operator is a subspace. (Contributed by Mario Carneiro, 19-May-2014.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝐴S       (𝑇𝐴) ∈ S

Theoremrnelshi 29046 The range of a linear operator is a subspace. (Contributed by Mario Carneiro, 17-Nov-2013.) (New usage is discouraged.)
𝑇 ∈ LinOp       ran 𝑇S

Theoremnlelshi 29047 The null space of a linear functional is a subspace. (Contributed by NM, 11-Feb-2006.) (Revised by Mario Carneiro, 17-Nov-2013.) (New usage is discouraged.)
𝑇 ∈ LinFn       (null‘𝑇) ∈ S

Theoremnlelchi 29048 The null space of a continuous linear functional is a closed subspace. Remark 3.8 of [Beran] p. 103. (Contributed by NM, 11-Feb-2006.) (Proof shortened by Mario Carneiro, 19-May-2014.) (New usage is discouraged.)
𝑇 ∈ LinFn    &   𝑇 ∈ ContFn       (null‘𝑇) ∈ C

19.6.11  Riesz lemma

Theoremriesz3i 29049* A continuous linear functional can be expressed as an inner product. Existence part of Theorem 3.9 of [Beran] p. 104. (Contributed by NM, 13-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinFn    &   𝑇 ∈ ContFn       𝑤 ∈ ℋ ∀𝑣 ∈ ℋ (𝑇𝑣) = (𝑣 ·ih 𝑤)

Theoremriesz4i 29050* A continuous linear functional can be expressed as an inner product. Uniqueness part of Theorem 3.9 of [Beran] p. 104. (Contributed by NM, 13-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinFn    &   𝑇 ∈ ContFn       ∃!𝑤 ∈ ℋ ∀𝑣 ∈ ℋ (𝑇𝑣) = (𝑣 ·ih 𝑤)

Theoremriesz4 29051* A continuous linear functional can be expressed as an inner product. Uniqueness part of Theorem 3.9 of [Beran] p. 104. See riesz2 29053 for the bounded linear functional version. (Contributed by NM, 16-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ (LinFn ∩ ContFn) → ∃!𝑤 ∈ ℋ ∀𝑣 ∈ ℋ (𝑇𝑣) = (𝑣 ·ih 𝑤))

Theoremriesz1 29052* Part 1 of the Riesz representation theorem for bounded linear functionals. A linear functional is bounded iff its value can be expressed as an inner product. Part of Theorem 17.3 of [Halmos] p. 31. For part 2, see riesz2 29053. For the continuous linear functional version, see riesz3i 29049 and riesz4 29051. (Contributed by NM, 25-Apr-2006.) (New usage is discouraged.)
(𝑇 ∈ LinFn → ((normfn𝑇) ∈ ℝ ↔ ∃𝑦 ∈ ℋ ∀𝑥 ∈ ℋ (𝑇𝑥) = (𝑥 ·ih 𝑦)))

Theoremriesz2 29053* Part 2 of the Riesz representation theorem for bounded linear functionals. The value of a bounded linear functional corresponds to a unique inner product. Part of Theorem 17.3 of [Halmos] p. 31. For part 1, see riesz1 29052. (Contributed by NM, 25-Apr-2006.) (New usage is discouraged.)
((𝑇 ∈ LinFn ∧ (normfn𝑇) ∈ ℝ) → ∃!𝑦 ∈ ℋ ∀𝑥 ∈ ℋ (𝑇𝑥) = (𝑥 ·ih 𝑦))

Theoremcnlnadjlem1 29054* Lemma for cnlnadji 29063 (Theorem 3.10 of [Beran] p. 104: every continuous linear operator has an adjoint). The value of the auxiliary functional 𝐺. (Contributed by NM, 16-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp    &   𝐺 = (𝑔 ∈ ℋ ↦ ((𝑇𝑔) ·ih 𝑦))       (𝐴 ∈ ℋ → (𝐺𝐴) = ((𝑇𝐴) ·ih 𝑦))

Theoremcnlnadjlem2 29055* Lemma for cnlnadji 29063. 𝐺 is a continuous linear functional. (Contributed by NM, 16-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp    &   𝐺 = (𝑔 ∈ ℋ ↦ ((𝑇𝑔) ·ih 𝑦))       (𝑦 ∈ ℋ → (𝐺 ∈ LinFn ∧ 𝐺 ∈ ContFn))

Theoremcnlnadjlem3 29056* Lemma for cnlnadji 29063. By riesz4 29051, 𝐵 is the unique vector such that (𝑇𝑣) ·ih 𝑦) = (𝑣 ·ih 𝑤) for all 𝑣. (Contributed by NM, 17-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp    &   𝐺 = (𝑔 ∈ ℋ ↦ ((𝑇𝑔) ·ih 𝑦))    &   𝐵 = (𝑤 ∈ ℋ ∀𝑣 ∈ ℋ ((𝑇𝑣) ·ih 𝑦) = (𝑣 ·ih 𝑤))       (𝑦 ∈ ℋ → 𝐵 ∈ ℋ)

Theoremcnlnadjlem4 29057* Lemma for cnlnadji 29063. The values of auxiliary function 𝐹 are vectors. (Contributed by NM, 17-Feb-2006.) (Proof shortened by Mario Carneiro, 10-Sep-2015.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp    &   𝐺 = (𝑔 ∈ ℋ ↦ ((𝑇𝑔) ·ih 𝑦))    &   𝐵 = (𝑤 ∈ ℋ ∀𝑣 ∈ ℋ ((𝑇𝑣) ·ih 𝑦) = (𝑣 ·ih 𝑤))    &   𝐹 = (𝑦 ∈ ℋ ↦ 𝐵)       (𝐴 ∈ ℋ → (𝐹𝐴) ∈ ℋ)

Theoremcnlnadjlem5 29058* Lemma for cnlnadji 29063. 𝐹 is an adjoint of 𝑇 (later, we will show it is unique). (Contributed by NM, 18-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp    &   𝐺 = (𝑔 ∈ ℋ ↦ ((𝑇𝑔) ·ih 𝑦))    &   𝐵 = (𝑤 ∈ ℋ ∀𝑣 ∈ ℋ ((𝑇𝑣) ·ih 𝑦) = (𝑣 ·ih 𝑤))    &   𝐹 = (𝑦 ∈ ℋ ↦ 𝐵)       ((𝐴 ∈ ℋ ∧ 𝐶 ∈ ℋ) → ((𝑇𝐶) ·ih 𝐴) = (𝐶 ·ih (𝐹𝐴)))

Theoremcnlnadjlem6 29059* Lemma for cnlnadji 29063. 𝐹 is linear. (Contributed by NM, 17-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp    &   𝐺 = (𝑔 ∈ ℋ ↦ ((𝑇𝑔) ·ih 𝑦))    &   𝐵 = (𝑤 ∈ ℋ ∀𝑣 ∈ ℋ ((𝑇𝑣) ·ih 𝑦) = (𝑣 ·ih 𝑤))    &   𝐹 = (𝑦 ∈ ℋ ↦ 𝐵)       𝐹 ∈ LinOp

Theoremcnlnadjlem7 29060* Lemma for cnlnadji 29063. Helper lemma to show that 𝐹 is continuous. (Contributed by NM, 18-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp    &   𝐺 = (𝑔 ∈ ℋ ↦ ((𝑇𝑔) ·ih 𝑦))    &   𝐵 = (𝑤 ∈ ℋ ∀𝑣 ∈ ℋ ((𝑇𝑣) ·ih 𝑦) = (𝑣 ·ih 𝑤))    &   𝐹 = (𝑦 ∈ ℋ ↦ 𝐵)       (𝐴 ∈ ℋ → (norm‘(𝐹𝐴)) ≤ ((normop𝑇) · (norm𝐴)))

Theoremcnlnadjlem8 29061* Lemma for cnlnadji 29063. 𝐹 is continuous. (Contributed by NM, 17-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp    &   𝐺 = (𝑔 ∈ ℋ ↦ ((𝑇𝑔) ·ih 𝑦))    &   𝐵 = (𝑤 ∈ ℋ ∀𝑣 ∈ ℋ ((𝑇𝑣) ·ih 𝑦) = (𝑣 ·ih 𝑤))    &   𝐹 = (𝑦 ∈ ℋ ↦ 𝐵)       𝐹 ∈ ContOp

Theoremcnlnadjlem9 29062* Lemma for cnlnadji 29063. 𝐹 provides an example showing the existence of a continuous linear adjoint. (Contributed by NM, 18-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp    &   𝐺 = (𝑔 ∈ ℋ ↦ ((𝑇𝑔) ·ih 𝑦))    &   𝐵 = (𝑤 ∈ ℋ ∀𝑣 ∈ ℋ ((𝑇𝑣) ·ih 𝑦) = (𝑣 ·ih 𝑤))    &   𝐹 = (𝑦 ∈ ℋ ↦ 𝐵)       𝑡 ∈ (LinOp ∩ ContOp)∀𝑥 ∈ ℋ ∀𝑧 ∈ ℋ ((𝑇𝑥) ·ih 𝑧) = (𝑥 ·ih (𝑡𝑧))

Theoremcnlnadji 29063* Every continuous linear operator has an adjoint. Theorem 3.10 of [Beran] p. 104. (Contributed by NM, 18-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp       𝑡 ∈ (LinOp ∩ ContOp)∀𝑥 ∈ ℋ ∀𝑦 ∈ ℋ ((𝑇𝑥) ·ih 𝑦) = (𝑥 ·ih (𝑡𝑦))

Theoremcnlnadjeui 29064* Every continuous linear operator has a unique adjoint. Theorem 3.10 of [Beran] p. 104. (Contributed by NM, 18-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇 ∈ ContOp       ∃!𝑡 ∈ (LinOp ∩ ContOp)∀𝑥 ∈ ℋ ∀𝑦 ∈ ℋ ((𝑇𝑥) ·ih 𝑦) = (𝑥 ·ih (𝑡𝑦))

Theoremcnlnadjeu 29065* Every continuous linear operator has a unique adjoint. Theorem 3.10 of [Beran] p. 104. (Contributed by NM, 19-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ (LinOp ∩ ContOp) → ∃!𝑡 ∈ (LinOp ∩ ContOp)∀𝑥 ∈ ℋ ∀𝑦 ∈ ℋ ((𝑇𝑥) ·ih 𝑦) = (𝑥 ·ih (𝑡𝑦)))

Theoremcnlnadj 29066* Every continuous linear operator has an adjoint. Theorem 3.10 of [Beran] p. 104. (Contributed by NM, 18-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ (LinOp ∩ ContOp) → ∃𝑡 ∈ (LinOp ∩ ContOp)∀𝑥 ∈ ℋ ∀𝑦 ∈ ℋ ((𝑇𝑥) ·ih 𝑦) = (𝑥 ·ih (𝑡𝑦)))

Theoremcnlnssadj 29067 Every continuous linear Hilbert space operator has an adjoint. (Contributed by NM, 18-Feb-2006.) (New usage is discouraged.)
(LinOp ∩ ContOp) ⊆ dom adj

Theorembdopssadj 29068 Every bounded linear Hilbert space operator has an adjoint. (Contributed by NM, 19-Feb-2006.) (New usage is discouraged.)

Theorembdopadj 29069 Every bounded linear Hilbert space operator has an adjoint. (Contributed by NM, 22-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ BndLinOp → 𝑇 ∈ dom adj)

Theoremadjbdln 29070 The adjoint of a bounded linear operator is a bounded linear operator. (Contributed by NM, 19-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ BndLinOp → (adj𝑇) ∈ BndLinOp)

Theoremadjbdlnb 29071 An operator is bounded and linear iff its adjoint is. (Contributed by NM, 19-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ BndLinOp ↔ (adj𝑇) ∈ BndLinOp)

Theoremadjbd1o 29072 The mapping of adjoints of bounded linear operators is one-to-one onto. (Contributed by NM, 19-Feb-2006.) (New usage is discouraged.)

Theoremadjlnop 29073 The adjoint of an operator is linear. Proposition 1 of [AkhiezerGlazman] p. 80. (Contributed by NM, 17-Jun-2006.) (New usage is discouraged.)

Theoremadjsslnop 29074 Every operator with an adjoint is linear. (Contributed by NM, 17-Jun-2006.) (New usage is discouraged.)

Theoremnmopadjlei 29075 Property of the norm of an adjoint. Part of proof of Theorem 3.10 of [Beran] p. 104. (Contributed by NM, 22-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ BndLinOp       (𝐴 ∈ ℋ → (norm‘((adj𝑇)‘𝐴)) ≤ ((normop𝑇) · (norm𝐴)))

Theoremnmopadjlem 29076 Lemma for nmopadji 29077. (Contributed by NM, 22-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ BndLinOp       (normop‘(adj𝑇)) ≤ (normop𝑇)

Theoremnmopadji 29077 Property of the norm of an adjoint. Theorem 3.11(v) of [Beran] p. 106. (Contributed by NM, 22-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ BndLinOp       (normop‘(adj𝑇)) = (normop𝑇)

Theoremadjeq0 29078 An operator is zero iff its adjoint is zero. Theorem 3.11(i) of [Beran] p. 106. (Contributed by NM, 20-Feb-2006.) (New usage is discouraged.)
(𝑇 = 0hop ↔ (adj𝑇) = 0hop )

Theoremadjmul 29079 The adjoint of the scalar product of an operator. Theorem 3.11(ii) of [Beran] p. 106. (Contributed by NM, 21-Feb-2006.) (New usage is discouraged.)

Theoremadjadd 29080 The adjoint of the sum of two operators. Theorem 3.11(iii) of [Beran] p. 106. (Contributed by NM, 22-Feb-2006.) (New usage is discouraged.)

Theoremnmoptrii 29081 Triangle inequality for the norms of bounded linear operators. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑆 ∈ BndLinOp    &   𝑇 ∈ BndLinOp       (normop‘(𝑆 +op 𝑇)) ≤ ((normop𝑆) + (normop𝑇))

Theoremnmopcoi 29082 Upper bound for the norm of the composition of two bounded linear operators. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑆 ∈ BndLinOp    &   𝑇 ∈ BndLinOp       (normop‘(𝑆𝑇)) ≤ ((normop𝑆) · (normop𝑇))

Theorembdophsi 29083 The sum of two bounded linear operators is a bounded linear operator. (Contributed by NM, 9-Mar-2006.) (New usage is discouraged.)
𝑆 ∈ BndLinOp    &   𝑇 ∈ BndLinOp       (𝑆 +op 𝑇) ∈ BndLinOp

Theorembdophdi 29084 The difference between two bounded linear operators is bounded. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑆 ∈ BndLinOp    &   𝑇 ∈ BndLinOp       (𝑆op 𝑇) ∈ BndLinOp

Theorembdopcoi 29085 The composition of two bounded linear operators is bounded. (Contributed by NM, 9-Mar-2006.) (New usage is discouraged.)
𝑆 ∈ BndLinOp    &   𝑇 ∈ BndLinOp       (𝑆𝑇) ∈ BndLinOp

Theoremnmoptri2i 29086 Triangle-type inequality for the norms of bounded linear operators. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑆 ∈ BndLinOp    &   𝑇 ∈ BndLinOp       ((normop𝑆) − (normop𝑇)) ≤ (normop‘(𝑆 +op 𝑇))

Theoremadjcoi 29087 The adjoint of a composition of bounded linear operators. Theorem 3.11(viii) of [Beran] p. 106. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)

Theoremnmopcoadji 29088 The norm of an operator composed with its adjoint. Part of Theorem 3.11(vi) of [Beran] p. 106. (Contributed by NM, 8-Mar-2006.) (New usage is discouraged.)
𝑇 ∈ BndLinOp       (normop‘((adj𝑇) ∘ 𝑇)) = ((normop𝑇)↑2)

Theoremnmopcoadj2i 29089 The norm of an operator composed with its adjoint. Part of Theorem 3.11(vi) of [Beran] p. 106. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑇 ∈ BndLinOp       (normop‘(𝑇 ∘ (adj𝑇))) = ((normop𝑇)↑2)

Theoremnmopcoadj0i 29090 An operator composed with its adjoint is zero iff the operator is zero. Theorem 3.11(vii) of [Beran] p. 106. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑇 ∈ BndLinOp       ((𝑇 ∘ (adj𝑇)) = 0hop𝑇 = 0hop )

19.6.13  Quantum computation error bound theorem

Theoremunierri 29091 If we approximate a chain of unitary transformations (quantum computer gates) 𝐹, 𝐺 by other unitary transformations 𝑆, 𝑇, the error increases at most additively. Equation 4.73 of [NielsenChuang] p. 195. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝐹 ∈ UniOp    &   𝐺 ∈ UniOp    &   𝑆 ∈ UniOp    &   𝑇 ∈ UniOp       (normop‘((𝐹𝐺) −op (𝑆𝑇))) ≤ ((normop‘(𝐹op 𝑆)) + (normop‘(𝐺op 𝑇)))

19.6.14  Dirac bra-ket notation (cont.)

Theorembranmfn 29092 The norm of the bra function. (Contributed by NM, 24-May-2006.) (New usage is discouraged.)
(𝐴 ∈ ℋ → (normfn‘(bra‘𝐴)) = (norm𝐴))

Theorembrabn 29093 The bra of a vector is a bounded functional. (Contributed by NM, 26-May-2006.) (New usage is discouraged.)
(𝐴 ∈ ℋ → (normfn‘(bra‘𝐴)) ∈ ℝ)

Theoremrnbra 29094 The set of bras equals the set of continuous linear functionals. (Contributed by NM, 26-May-2006.) (New usage is discouraged.)
ran bra = (LinFn ∩ ContFn)

Theorembra11 29095 The bra function maps vectors one-to-one onto the set of continuous linear functionals. (Contributed by NM, 26-May-2006.) (Proof shortened by Mario Carneiro, 16-Nov-2013.) (New usage is discouraged.)
bra: ℋ–1-1-onto→(LinFn ∩ ContFn)

Theorembracnln 29096 A bra is a continuous linear functional. (Contributed by NM, 30-May-2006.) (New usage is discouraged.)
(𝐴 ∈ ℋ → (bra‘𝐴) ∈ (LinFn ∩ ContFn))

Theoremcnvbraval 29097* Value of the converse of the bra function. Based on the Riesz Lemma riesz4 29051, this very important theorem not only justifies the Dirac bra-ket notation, but allows us to extract a unique vector from any continuous linear functional from which the functional can be recovered; i.e. a single vector can "store" all of the information contained in any entire continuous linear functional (mapping from to ). (Contributed by NM, 26-May-2006.) (New usage is discouraged.)
(𝑇 ∈ (LinFn ∩ ContFn) → (bra‘𝑇) = (𝑦 ∈ ℋ ∀𝑥 ∈ ℋ (𝑇𝑥) = (𝑥 ·ih 𝑦)))

Theoremcnvbracl 29098 Closure of the converse of the bra function. (Contributed by NM, 26-May-2006.) (New usage is discouraged.)
(𝑇 ∈ (LinFn ∩ ContFn) → (bra‘𝑇) ∈ ℋ)

Theoremcnvbrabra 29099 The converse bra of the bra of a vector is the vector itself. (Contributed by NM, 30-May-2006.) (New usage is discouraged.)
(𝐴 ∈ ℋ → (bra‘(bra‘𝐴)) = 𝐴)

Theorembracnvbra 29100 The bra of the converse bra of a continuous linear functional. (Contributed by NM, 31-May-2006.) (New usage is discouraged.)
(𝑇 ∈ (LinFn ∩ ContFn) → (bra‘(bra‘𝑇)) = 𝑇)

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