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Theorem List for Metamath Proof Explorer - 28201-28300   *Has distinct variable group(s)
TypeLabelDescription
Statement

Theoremeleigvec2 28201 Membership in the set of eigenvectors of a Hilbert space operator. (Contributed by NM, 18-Mar-2006.) (New usage is discouraged.)
(𝑇: ℋ⟶ ℋ → (𝐴 ∈ (eigvec‘𝑇) ↔ (𝐴 ∈ ℋ ∧ 𝐴 ≠ 0 ∧ (𝑇𝐴) ∈ (span‘{𝐴}))))

Theoremeleigveccl 28202 Closure of an eigenvector of a Hilbert space operator. (Contributed by NM, 23-Mar-2006.) (New usage is discouraged.)
((𝑇: ℋ⟶ ℋ ∧ 𝐴 ∈ (eigvec‘𝑇)) → 𝐴 ∈ ℋ)

Theoremeigvalval 28203 The eigenvalue of an eigenvector of a Hilbert space operator. (Contributed by NM, 11-Mar-2006.) (New usage is discouraged.)
((𝑇: ℋ⟶ ℋ ∧ 𝐴 ∈ (eigvec‘𝑇)) → ((eigval‘𝑇)‘𝐴) = (((𝑇𝐴) ·ih 𝐴) / ((norm𝐴)↑2)))

Theoremeigvalcl 28204 An eigenvalue is a complex number. (Contributed by NM, 11-Mar-2006.) (New usage is discouraged.)
((𝑇: ℋ⟶ ℋ ∧ 𝐴 ∈ (eigvec‘𝑇)) → ((eigval‘𝑇)‘𝐴) ∈ ℂ)

Theoremeigvec1 28205 Property of an eigenvector. (Contributed by NM, 12-Mar-2006.) (New usage is discouraged.)
((𝑇: ℋ⟶ ℋ ∧ 𝐴 ∈ (eigvec‘𝑇)) → ((𝑇𝐴) = (((eigval‘𝑇)‘𝐴) · 𝐴) ∧ 𝐴 ≠ 0))

Theoremeighmre 28206 The eigenvalues of a Hermitian operator are real. Equation 1.30 of [Hughes] p. 49. (Contributed by NM, 19-Mar-2006.) (New usage is discouraged.)
((𝑇 ∈ HrmOp ∧ 𝐴 ∈ (eigvec‘𝑇)) → ((eigval‘𝑇)‘𝐴) ∈ ℝ)

Theoremeighmorth 28207 Eigenvectors of a Hermitian operator with distinct eigenvalues are orthogonal. Equation 1.31 of [Hughes] p. 49. (Contributed by NM, 23-Mar-2006.) (New usage is discouraged.)
(((𝑇 ∈ HrmOp ∧ 𝐴 ∈ (eigvec‘𝑇)) ∧ (𝐵 ∈ (eigvec‘𝑇) ∧ ((eigval‘𝑇)‘𝐴) ≠ ((eigval‘𝑇)‘𝐵))) → (𝐴 ·ih 𝐵) = 0)

Theoremnmopnegi 28208 Value of the norm of the negative of a Hilbert space operator. Unlike nmophmi 28274, the operator does not have to be bounded. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑇: ℋ⟶ ℋ       (normop‘(-1 ·op 𝑇)) = (normop𝑇)

Theoremlnop0 28209 The value of a linear Hilbert space operator at zero is zero. Remark in [Beran] p. 99. (Contributed by NM, 13-Aug-2006.) (New usage is discouraged.)
(𝑇 ∈ LinOp → (𝑇‘0) = 0)

Theoremlnopmul 28210 Multiplicative property of a linear Hilbert space operator. (Contributed by NM, 13-Aug-2006.) (New usage is discouraged.)
((𝑇 ∈ LinOp ∧ 𝐴 ∈ ℂ ∧ 𝐵 ∈ ℋ) → (𝑇‘(𝐴 · 𝐵)) = (𝐴 · (𝑇𝐵)))

Theoremlnopli 28211 Basic scalar product property of a linear Hilbert space operator. (Contributed by NM, 23-Jan-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp       ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℋ ∧ 𝐶 ∈ ℋ) → (𝑇‘((𝐴 · 𝐵) + 𝐶)) = ((𝐴 · (𝑇𝐵)) + (𝑇𝐶)))

Theoremlnopfi 28212 A linear Hilbert space operator is a Hilbert space operator. (Contributed by NM, 23-Jan-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp       𝑇: ℋ⟶ ℋ

Theoremlnop0i 28213 The value of a linear Hilbert space operator at zero is zero. Remark in [Beran] p. 99. (Contributed by NM, 11-May-2005.) (New usage is discouraged.)
𝑇 ∈ LinOp       (𝑇‘0) = 0

Theoremlnopaddi 28214 Additive property of a linear Hilbert space operator. (Contributed by NM, 11-May-2005.) (New usage is discouraged.)
𝑇 ∈ LinOp       ((𝐴 ∈ ℋ ∧ 𝐵 ∈ ℋ) → (𝑇‘(𝐴 + 𝐵)) = ((𝑇𝐴) + (𝑇𝐵)))

Theoremlnopmuli 28215 Multiplicative property of a linear Hilbert space operator. (Contributed by NM, 11-May-2005.) (New usage is discouraged.)
𝑇 ∈ LinOp       ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℋ) → (𝑇‘(𝐴 · 𝐵)) = (𝐴 · (𝑇𝐵)))

Theoremlnopaddmuli 28216 Sum/product property of a linear Hilbert space operator. (Contributed by NM, 1-Jul-2005.) (New usage is discouraged.)
𝑇 ∈ LinOp       ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℋ ∧ 𝐶 ∈ ℋ) → (𝑇‘(𝐵 + (𝐴 · 𝐶))) = ((𝑇𝐵) + (𝐴 · (𝑇𝐶))))

Theoremlnopsubi 28217 Subtraction property for a linear Hilbert space operator. (Contributed by NM, 1-Jul-2005.) (New usage is discouraged.)
𝑇 ∈ LinOp       ((𝐴 ∈ ℋ ∧ 𝐵 ∈ ℋ) → (𝑇‘(𝐴 𝐵)) = ((𝑇𝐴) − (𝑇𝐵)))

Theoremlnopsubmuli 28218 Subtraction/product property of a linear Hilbert space operator. (Contributed by NM, 2-Jul-2005.) (New usage is discouraged.)
𝑇 ∈ LinOp       ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℋ ∧ 𝐶 ∈ ℋ) → (𝑇‘(𝐵 (𝐴 · 𝐶))) = ((𝑇𝐵) − (𝐴 · (𝑇𝐶))))

Theoremlnopmulsubi 28219 Product/subtraction property of a linear Hilbert space operator. (Contributed by NM, 2-Jul-2005.) (New usage is discouraged.)
𝑇 ∈ LinOp       ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℋ ∧ 𝐶 ∈ ℋ) → (𝑇‘((𝐴 · 𝐵) − 𝐶)) = ((𝐴 · (𝑇𝐵)) − (𝑇𝐶)))

Theoremhomco2 28220 Move a scalar product out of a composition of operators. The operator 𝑇 must be linear, unlike homco1 28044 that works for any operators. (Contributed by NM, 13-Aug-2006.) (New usage is discouraged.)
((𝐴 ∈ ℂ ∧ 𝑇 ∈ LinOp ∧ 𝑈: ℋ⟶ ℋ) → (𝑇 ∘ (𝐴 ·op 𝑈)) = (𝐴 ·op (𝑇𝑈)))

Theoremidunop 28221 The identity function (restricted to Hilbert space) is a unitary operator. (Contributed by NM, 21-Jan-2006.) (New usage is discouraged.)
( I ↾ ℋ) ∈ UniOp

Theorem0cnop 28222 The identically zero function is a continuous Hilbert space operator. (Contributed by NM, 7-Feb-2006.) (New usage is discouraged.)
0hop ∈ ConOp

Theorem0cnfn 28223 The identically zero function is a continuous Hilbert space functional. (Contributed by NM, 7-Feb-2006.) (New usage is discouraged.)
( ℋ × {0}) ∈ ConFn

Theoremidcnop 28224 The identity function (restricted to Hilbert space) is a continuous operator. (Contributed by NM, 7-Feb-2006.) (New usage is discouraged.)
( I ↾ ℋ) ∈ ConOp

Theoremidhmop 28225 The Hilbert space identity operator is a Hermitian operator. (Contributed by NM, 22-Apr-2006.) (New usage is discouraged.)
Iop ∈ HrmOp

Theorem0hmop 28226 The identically zero function is a Hermitian operator. (Contributed by NM, 8-Aug-2006.) (New usage is discouraged.)
0hop ∈ HrmOp

Theorem0lnop 28227 The identically zero function is a linear Hilbert space operator. (Contributed by NM, 7-Feb-2006.) (New usage is discouraged.)
0hop ∈ LinOp

Theorem0lnfn 28228 The identically zero function is a linear Hilbert space functional. (Contributed by NM, 14-Feb-2006.) (New usage is discouraged.)
( ℋ × {0}) ∈ LinFn

Theoremnmop0 28229 The norm of the zero operator is zero. (Contributed by NM, 8-Feb-2006.) (New usage is discouraged.)
(normop‘ 0hop ) = 0

Theoremnmfn0 28230 The norm of the identically zero functional is zero. (Contributed by NM, 25-Apr-2006.) (New usage is discouraged.)
(normfn‘( ℋ × {0})) = 0

TheoremhmopbdoptHIL 28231 A Hermitian operator is a bounded linear operator (Hellinger-Toeplitz Theorem). (Contributed by NM, 18-Jan-2008.) (New usage is discouraged.)
(𝑇 ∈ HrmOp → 𝑇 ∈ BndLinOp)

Theoremhoddii 28232 Distributive law for Hilbert space operator difference. (Interestingly, the reverse distributive law hocsubdiri 28023 does not require linearity.) (Contributed by NM, 11-Mar-2006.) (New usage is discouraged.)
𝑅 ∈ LinOp    &   𝑆: ℋ⟶ ℋ    &   𝑇: ℋ⟶ ℋ       (𝑅 ∘ (𝑆op 𝑇)) = ((𝑅𝑆) −op (𝑅𝑇))

Theoremhoddi 28233 Distributive law for Hilbert space operator difference. (Interestingly, the reverse distributive law hocsubdiri 28023 does not require linearity.) (Contributed by NM, 23-Aug-2006.) (New usage is discouraged.)
((𝑅 ∈ LinOp ∧ 𝑆: ℋ⟶ ℋ ∧ 𝑇: ℋ⟶ ℋ) → (𝑅 ∘ (𝑆op 𝑇)) = ((𝑅𝑆) −op (𝑅𝑇)))

Theoremnmop0h 28234 The norm of any operator on the trivial Hilbert space is zero. (This is the reason we need ℋ ≠ 0 in nmopun 28257.) (Contributed by NM, 24-Feb-2006.) (New usage is discouraged.)
(( ℋ = 0𝑇: ℋ⟶ ℋ) → (normop𝑇) = 0)

Theoremidlnop 28235 The identity function (restricted to Hilbert space) is a linear operator. (Contributed by NM, 24-Jan-2006.) (New usage is discouraged.)
( I ↾ ℋ) ∈ LinOp

Theorem0bdop 28236 The identically zero operator is bounded. (Contributed by NM, 14-Feb-2006.) (New usage is discouraged.)
0hop ∈ BndLinOp

Theoremadj0 28237 Adjoint of the zero operator. (Contributed by NM, 20-Feb-2006.) (New usage is discouraged.)

Theoremnmlnop0iALT 28238 A linear operator with a zero norm is identically zero. (Contributed by NM, 8-Feb-2006.) (New usage is discouraged.) (Proof modification is discouraged.)
𝑇 ∈ LinOp       ((normop𝑇) = 0 ↔ 𝑇 = 0hop )

Theoremnmlnop0iHIL 28239 A linear operator with a zero norm is identically zero. (Contributed by NM, 18-Jan-2008.) (New usage is discouraged.)
𝑇 ∈ LinOp       ((normop𝑇) = 0 ↔ 𝑇 = 0hop )

Theoremnmlnopgt0i 28240 A linear Hilbert space operator that is not identically zero has a positive norm. (Contributed by NM, 9-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp       (𝑇 ≠ 0hop ↔ 0 < (normop𝑇))

Theoremnmlnop0 28241 A linear operator with a zero norm is identically zero. (Contributed by NM, 12-Aug-2006.) (New usage is discouraged.)
(𝑇 ∈ LinOp → ((normop𝑇) = 0 ↔ 𝑇 = 0hop ))

Theoremnmlnopne0 28242 A linear operator with a nonzero norm is nonzero. (Contributed by NM, 12-Aug-2006.) (New usage is discouraged.)
(𝑇 ∈ LinOp → ((normop𝑇) ≠ 0 ↔ 𝑇 ≠ 0hop ))

Theoremlnopmi 28243 The scalar product of a linear operator is a linear operator. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp       (𝐴 ∈ ℂ → (𝐴 ·op 𝑇) ∈ LinOp)

Theoremlnophsi 28244 The sum of two linear operators is linear. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑆 ∈ LinOp    &   𝑇 ∈ LinOp       (𝑆 +op 𝑇) ∈ LinOp

Theoremlnophdi 28245 The difference of two linear operators is linear. (Contributed by NM, 27-Jul-2006.) (New usage is discouraged.)
𝑆 ∈ LinOp    &   𝑇 ∈ LinOp       (𝑆op 𝑇) ∈ LinOp

Theoremlnopcoi 28246 The composition of two linear operators is linear. (Contributed by NM, 8-Mar-2006.) (New usage is discouraged.)
𝑆 ∈ LinOp    &   𝑇 ∈ LinOp       (𝑆𝑇) ∈ LinOp

Theoremlnopco0i 28247 The composition of a linear operator with one whose norm is zero. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
𝑆 ∈ LinOp    &   𝑇 ∈ LinOp       ((normop𝑇) = 0 → (normop‘(𝑆𝑇)) = 0)

Theoremlnopeq0lem1 28248 Lemma for lnopeq0i 28250. Apply the generalized polarization identity polid2i 27398 to the quadratic form ((𝑇𝑥), 𝑥). (Contributed by NM, 26-Jul-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝐴 ∈ ℋ    &   𝐵 ∈ ℋ       ((𝑇𝐴) ·ih 𝐵) = (((((𝑇‘(𝐴 + 𝐵)) ·ih (𝐴 + 𝐵)) − ((𝑇‘(𝐴 𝐵)) ·ih (𝐴 𝐵))) + (i · (((𝑇‘(𝐴 + (i · 𝐵))) ·ih (𝐴 + (i · 𝐵))) − ((𝑇‘(𝐴 (i · 𝐵))) ·ih (𝐴 (i · 𝐵)))))) / 4)

Theoremlnopeq0lem2 28249 Lemma for lnopeq0i 28250. (Contributed by NM, 26-Jul-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp       ((𝐴 ∈ ℋ ∧ 𝐵 ∈ ℋ) → ((𝑇𝐴) ·ih 𝐵) = (((((𝑇‘(𝐴 + 𝐵)) ·ih (𝐴 + 𝐵)) − ((𝑇‘(𝐴 𝐵)) ·ih (𝐴 𝐵))) + (i · (((𝑇‘(𝐴 + (i · 𝐵))) ·ih (𝐴 + (i · 𝐵))) − ((𝑇‘(𝐴 (i · 𝐵))) ·ih (𝐴 (i · 𝐵)))))) / 4))

Theoremlnopeq0i 28250* A condition implying that a linear Hilbert space operator is identically zero. Unlike ho01i 28071 for arbitrary operators, when the operator is linear we need to consider only the values of the quadratic form (𝑇𝑥) ·ih 𝑥). (Contributed by NM, 26-Jul-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp       (∀𝑥 ∈ ℋ ((𝑇𝑥) ·ih 𝑥) = 0 ↔ 𝑇 = 0hop )

Theoremlnopeqi 28251* Two linear Hilbert space operators are equal iff their quadratic forms are equal. (Contributed by NM, 27-Jul-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑈 ∈ LinOp       (∀𝑥 ∈ ℋ ((𝑇𝑥) ·ih 𝑥) = ((𝑈𝑥) ·ih 𝑥) ↔ 𝑇 = 𝑈)

Theoremlnopeq 28252* Two linear Hilbert space operators are equal iff their quadratic forms are equal. (Contributed by NM, 27-Jul-2006.) (New usage is discouraged.)
((𝑇 ∈ LinOp ∧ 𝑈 ∈ LinOp) → (∀𝑥 ∈ ℋ ((𝑇𝑥) ·ih 𝑥) = ((𝑈𝑥) ·ih 𝑥) ↔ 𝑇 = 𝑈))

Theoremlnopunilem1 28253* Lemma for lnopunii 28255. (Contributed by NM, 14-May-2005.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑥 ∈ ℋ (norm‘(𝑇𝑥)) = (norm𝑥)    &   𝐴 ∈ ℋ    &   𝐵 ∈ ℋ    &   𝐶 ∈ ℂ       (ℜ‘(𝐶 · ((𝑇𝐴) ·ih (𝑇𝐵)))) = (ℜ‘(𝐶 · (𝐴 ·ih 𝐵)))

Theoremlnopunilem2 28254* Lemma for lnopunii 28255. (Contributed by NM, 12-May-2005.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑥 ∈ ℋ (norm‘(𝑇𝑥)) = (norm𝑥)    &   𝐴 ∈ ℋ    &   𝐵 ∈ ℋ       ((𝑇𝐴) ·ih (𝑇𝐵)) = (𝐴 ·ih 𝐵)

Theoremlnopunii 28255* If a linear operator (whose range is ) is idempotent in the norm, the operator is unitary. Similar to theorem in [AkhiezerGlazman] p. 73. (Contributed by NM, 23-Jan-2006.) (New usage is discouraged.)
𝑇 ∈ LinOp    &   𝑇: ℋ–onto→ ℋ    &   𝑥 ∈ ℋ (norm‘(𝑇𝑥)) = (norm𝑥)       𝑇 ∈ UniOp

Theoremelunop2 28256* An operator is unitary iff it is linear, onto, and idempotent in the norm. Similar to theorem in [AkhiezerGlazman] p. 73, and its converse. (Contributed by NM, 24-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ UniOp ↔ (𝑇 ∈ LinOp ∧ 𝑇: ℋ–onto→ ℋ ∧ ∀𝑥 ∈ ℋ (norm‘(𝑇𝑥)) = (norm𝑥)))

Theoremnmopun 28257 Norm of a unitary Hilbert space operator. (Contributed by NM, 25-Feb-2006.) (New usage is discouraged.)
(( ℋ ≠ 0𝑇 ∈ UniOp) → (normop𝑇) = 1)

Theoremunopbd 28258 A unitary operator is a bounded linear operator. (Contributed by NM, 10-Mar-2006.) (New usage is discouraged.)
(𝑇 ∈ UniOp → 𝑇 ∈ BndLinOp)

Theoremlnophmlem1 28259* Lemma for lnophmi 28261. (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 28260* Lemma for lnophmi 28261. (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 28261* 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 28262* 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 28263 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 28264 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 28265 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 28266 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 28267 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 28268 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 28269* Lemma for nmcopexi 28270 and nmcfnexi 28294. 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 28270 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 ∈ ConOp       (normop𝑇) ∈ ℝ

Theoremnmcoplbi 28271 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 ∈ ConOp       (𝐴 ∈ ℋ → (norm‘(𝑇𝐴)) ≤ ((normop𝑇) · (norm𝐴)))

Theoremnmcopex 28272 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 ∈ ConOp) → (normop𝑇) ∈ ℝ)

Theoremnmcoplb 28273 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 ∈ ConOp ∧ 𝐴 ∈ ℋ) → (norm‘(𝑇𝐴)) ≤ ((normop𝑇) · (norm𝐴)))

Theoremnmophmi 28274 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 28275 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 28276* Lemma for lnopconi 28277 and lnfnconi 28298. (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 28277* 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 ∈ ConOp ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (norm‘(𝑇𝑦)) ≤ (𝑥 · (norm𝑦)))

Theoremlnopcon 28278* 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 ∈ ConOp ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (norm‘(𝑇𝑦)) ≤ (𝑥 · (norm𝑦))))

Theoremlnopcnbd 28279 A linear operator is continuous iff it is bounded. (Contributed by NM, 14-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ LinOp → (𝑇 ∈ ConOp ↔ 𝑇 ∈ BndLinOp))

Theoremlncnopbd 28280 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 ∩ ConOp) ↔ 𝑇 ∈ BndLinOp)

Theoremlncnbd 28281 A continuous linear operator is a bounded linear operator. (Contributed by NM, 18-Feb-2006.) (New usage is discouraged.)
(LinOp ∩ ConOp) = BndLinOp

Theoremlnopcnre 28282 A linear operator is continuous iff it is bounded. (Contributed by NM, 14-Feb-2006.) (New usage is discouraged.)
(𝑇 ∈ LinOp → (𝑇 ∈ ConOp ↔ (normop𝑇) ∈ ℝ))

Theoremlnfnli 28283 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 28284 A linear Hilbert space functional is a functional. (Contributed by NM, 11-Feb-2006.) (New usage is discouraged.)
𝑇 ∈ LinFn       𝑇: ℋ⟶ℂ

Theoremlnfn0i 28285 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 28286 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 28287 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 28288 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 28289 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 28290 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 28291 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 28292 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 28293 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 28294 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 ∈ ConFn       (normfn𝑇) ∈ ℝ

Theoremnmcfnlbi 28295 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 ∈ ConFn       (𝐴 ∈ ℋ → (abs‘(𝑇𝐴)) ≤ ((normfn𝑇) · (norm𝐴)))

Theoremnmcfnex 28296 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 ∈ ConFn) → (normfn𝑇) ∈ ℝ)

Theoremnmcfnlb 28297 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 ∈ ConFn ∧ 𝐴 ∈ ℋ) → (abs‘(𝑇𝐴)) ≤ ((normfn𝑇) · (norm𝐴)))

Theoremlnfnconi 28298* 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 ∈ ConFn ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇𝑦)) ≤ (𝑥 · (norm𝑦)))

Theoremlnfncon 28299* 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 ∈ ConFn ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇𝑦)) ≤ (𝑥 · (norm𝑦))))

Theoremlnfncnbd 28300 A linear functional is continuous iff it is bounded. (Contributed by NM, 25-Apr-2006.) (New usage is discouraged.)
(𝑇 ∈ LinFn → (𝑇 ∈ ConFn ↔ (normfn𝑇) ∈ ℝ))

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