definition 12.79 Deficiency subspaces and indices

open in the book · parts/02-mathematical-methods/10-hilbert-spaces.tex:2142 · p. 436

ground object -- no derivation owed

Rests on

depends_on corollary 12.19 Double complement; the density criterion ¶
- depends_on proposition 12.17 The complement is always a closed subspace ¶
  - depends_on corollary 12.5 Continuity of the norm and of orthogonality ¶
    - depends_on definition 5.24 Orthogonal vectors ¶
      - depends_on definition 5.18 Inner product ¶
    - depends_on proposition 12.4 Cauchy–Schwarz and continuity of the inner product ¶
      - depends_on definition 12.2 Hilbert space ¶
      - depends_on proposition 5.20 Cauchy–Schwarz inequality ¶
      - proves proof ch:10-hilbert-spaces@proof-1 ¶
    - proves proof ch:10-hilbert-spaces@proof-2 ¶
  - depends_on definition 12.16 Orthogonal complement ¶
    - depends_on definition 5.24 Orthogonal vectors ¶ ↺
    - depends_on equation 5.52 eq:lin-orthogonal-complement ¶
  - proves proof ch:10-hilbert-spaces@proof-8 ¶
- depends_on theorem 12.18 Projection theorem ¶
  - depends_on proposition 12.17 The complement is always a closed subspace ¶ ↺
  - depends_on theorem 12.14 Closest point in a closed convex set ¶
    - depends_on definition 12.13 Convex set ¶
      - depends_on definition 5.7 Vector subspace ¶
    - depends_on definition 12.2 Hilbert space ¶ ↺
    - depends_on proposition 12.6 Parallelogram law and polarization ¶
      - depends_on definition 5.18 Inner product ¶ ↺
      - depends_on equation 5.44 eq:lin-norm-assoc ¶
      - proves proof ch:10-hilbert-spaces@proof-3 ¶
    - proves proof ch:10-hilbert-spaces@proof-7 ¶
  - proves proof ch:10-hilbert-spaces@proof-9 ¶
- proves proof ch:10-hilbert-spaces@proof-10 ¶
depends_on definition 12.71 Adjoint of a densely defined operator ¶
- depends_on corollary 12.19 Double complement; the density criterion ¶ ↺
- depends_on definition 12.69 Operator with a domain ¶
  - depends_on corollary 12.19 Double complement; the density criterion ¶ ↺
  - depends_on definition 5.37 Linear transformation ¶
    - depends_on definition 4.33 Vector space ¶
      - depends_on definition 4.8 Commutativity; abelian structure ¶
      - depends_on definition 4.32 Field ¶
      - depends_on definition 4.31 Module ¶
- depends_on theorem 12.38 Existence and uniqueness of the adjoint ¶
  - depends_on definition 5.41 Adjoint ¶
    - depends_on definition 5.18 Inner product ¶ ↺
    - depends_on definition 5.37 Linear transformation ¶ ↺
  - depends_on proposition 12.37 $\mathcal{B}(\mathcal{H})$ is a Banach algebra ¶
    - depends_on definition 12.35 Bounded operator; operator norm ¶
      - depends_on definition 5.37 Linear transformation ¶ ↺
      - depends_on definition 5.19 Norm ¶
    - depends_on proposition 12.8 Absolutely convergent series test ¶
      - depends_on definition 5.19 Norm ¶ ↺
      - depends_on definition 6.27 Convergence; Cauchy sequence; completeness ¶
      - proves proof ch:10-hilbert-spaces@proof-4 ¶
    - proves proof ch:10-hilbert-spaces@proof-19 ¶
  - depends_on theorem 12.46 Riesz representation ¶
    - depends_on definition 12.45 Continuous linear functional; the dual ¶
      - depends_on definition 12.35 Bounded operator; operator norm ¶ ↺
      - depends_on definition 5.46 Functional ¶
    - depends_on theorem 12.18 Projection theorem ¶ ↺
    - proves proof ch:10-hilbert-spaces@proof-24 ¶
  - proves proof ch:10-hilbert-spaces@proof-20 ¶
depends_on proposition 12.39 Algebra of the adjoint; the $C^{\ast}$ identity ¶
- depends_on proposition 12.37 $\mathcal{B}(\mathcal{H})$ is a Banach algebra ¶ ↺
- depends_on theorem 12.38 Existence and uniqueness of the adjoint ¶ ↺
- proves proof ch:10-hilbert-spaces@proof-21 ¶

Supports

depends_on definition A.269 Cayley transform ¶
- depends_on proposition A.270 Properties of the transform ¶
  - depends_on lemma A.271 Injectivity of $\identity-V$ for any isometric extension ¶
    - depends_on lemma A.272 The operator attached to an isometry ¶
  - depends_on lemma A.272 The operator attached to an isometry ¶ ↺
  - depends_on proposition A.273 Self-adjoint means unitary ¶
depends_on example 12.82 Momentum on the half-line: no self-adjoint extension ¶
- depends_on corollary A.275 Momentum on $[0,\infty)$: no extension ¶
depends_on example 12.81 Momentum on a finite interval: a circle of self-adjoint momenta ¶
- depends_on corollary A.274 Momentum on ${[}0,L{]}$: the circle of extensions ¶
- depends_on example 12.82 Momentum on the half-line: no self-adjoint extension ¶ ↺
depends_on lemma A.267 Isometry of $A\pm\ii\mu$, and closed range ¶
- depends_on definition A.269 Cayley transform ¶ ↺
- depends_on lemma A.268 The indices do not depend on $\mu$ ¶
- depends_on proposition A.270 Properties of the transform ¶ ↺
- depends_on proposition A.273 Self-adjoint means unitary ¶ ↺
depends_on lemma A.268 The indices do not depend on $\mu$ ¶ ↺
depends_on theorem A.266 von Neumann ¶
- depends_on corollary A.275 Momentum on $[0,\infty)$: no extension ¶ ↺
- depends_on corollary A.274 Momentum on ${[}0,L{]}$: the circle of extensions ¶ ↺
depends_on theorem 12.80 von Neumann's criterion ¶
- depends_on example 12.82 Momentum on the half-line: no self-adjoint extension ¶ ↺
- depends_on example 12.81 Momentum on a finite interval: a circle of self-adjoint momenta ¶ ↺

Neighborhood

Every logical edge within two steps of this node.

declared and complete
partly declared
a check failed
not graded
declared in the source
inferred from structure

Edges

type	direction	node	provenance	where
`depends_on`	→	Double complement; the density criterion	declared	parts/02-mathematical-methods/10-hilbert-spaces.tex:2154
`depends_on`	→	Adjoint of a densely defined operator	declared	parts/02-mathematical-methods/10-hilbert-spaces.tex:2154
`depends_on`	→	Algebra of the adjoint; the $C^{\ast}$ identity	declared	parts/02-mathematical-methods/10-hilbert-spaces.tex:2154
`depends_on`	←	Cayley transform	declared	appendices/A-long-proofs.tex:13421
`depends_on`	←	Momentum on the half-line: no self-adjoint extension	declared	parts/02-mathematical-methods/10-hilbert-spaces.tex:2291
`depends_on`	←	Momentum on a finite interval: a circle of self-adjoint momenta	declared	parts/02-mathematical-methods/10-hilbert-spaces.tex:2225
`depends_on`	←	Isometry of $A\pm\ii\mu$, and closed range	declared	appendices/A-long-proofs.tex:13342
`depends_on`	←	The indices do not depend on $\mu$	declared	appendices/A-long-proofs.tex:13373
`depends_on`	←	von Neumann	declared	appendices/A-long-proofs.tex:13322
`depends_on`	←	von Neumann's criterion	declared	parts/02-mathematical-methods/10-hilbert-spaces.tex:2179