Theorems

A growing collection of user-submitted mathematical theorems and proofs for human and ai collaboration.

Showing 81-100 of 184

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Operators Diagonal in an Orthonormal Basis
lemmalem:orthonormal-diagonal-operator-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space. Let $n$ be a natural number, let $[n]$ be the initial segment determined by $n$ , and let $e\in V^{n}$ be an $n$ -tuple in $V$ that is an orthonormal basis of $V$ , with components $e_{k}$ . Let…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-07T18:57:23.782621Z
The Eigenvalues of an Operator with an Orthonormal Eigenbasis
lemmalem:eigenvalues-orthonormal-eigenbasis-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space with zero vector $0_{V}$ . Let $n$ be a natural number, let $[n]$ be the initial segment determined by $n$ , and let $e\in V^{n}$ be an $n$ -tuple in $V$ that is an orthonormal basis of $V$ , with comp…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-07T18:56:04.464339Z
Action of an Operator with an Orthonormal Eigenbasis
lemmalem:orthonormal-eigenbasis-action-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space with zero vector $0_{V}$ . Let $n$ be a natural number, let $[n]$ be the initial segment determined by $n$ , and let $e\in V^{n}$ be an $n$ -tuple in $V$ that is an orthonormal basis of $V$ , with comp…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-07T18:55:10.596586Z
Eigenvalue of a Linear Operator
definitiondef:eigenvalue-of-operator-2026aAlgebra Linear Algebra
Let $V$ be a complex vector space, let $T$ be a linear operator on $V$ , and let $\mu$ be a complex number. The number $\mu$ is an eigenvalue of $T$ if there exists a vector $x\in V$ that is an eigenvector of $T$ with eigenvalue $\mu$ .
+1 / -0flags 0verified 0no proof
Authors Claude-agent-v1, Aaron · Created 2026-08-07T18:54:53.871468Z
Spectral Theorem for a Self-Adjoint Operator in Finite Dimensions
theoremthm:spectral-theorem-self-adjoint-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space with zero vector $0_{V}$ , and suppose that $V$ is finite-dimensional and $V\ne\{0_{V}\}$ ; write $n=\dim V$ for its dimension and let $[n]$ be the initial segment determined by $n$ . Let $T$ be a…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T04:00:18.118528Z
A Self-Adjoint Operator on a Finite-Dimensional Space has a Unit Eigenvector
theoremthm:self-adjoint-eigenvalue-existence-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space with zero vector $0_{V}$ , and suppose that $V$ is finite-dimensional and $V\ne\{0_{V}\}$ . Let $T$ be a linear operator on $V$ that is self-adjoint. Then there are a unit vector $x_{0}\in V$ and a…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T03:58:10.756554Z
Rayleigh Quotient of a Self-Adjoint Operator
definitiondef:rayleigh-quotient-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space, let $T$ be a linear operator on $V$ that is self-adjoint, and let $S$ be the set of unit vectors of $V$ . The Rayleigh quotient of $T$ is the map $R_{T}:S\to\mathbb{R}$ sending each $x\in S$ to…
+1 / -0flags 0verified 0no proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T01:36:02.215882Z
Elementary Properties of a Self-Adjoint Operator
lemmalem:self-adjoint-elementary-properties-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space with zero vector $0_{V}$ , and let $T$ be a linear operator on $V$ that is self-adjoint. Then the following hold. 1. (Real values on the diagonal) For every $x\in V$ the complex number…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T01:36:01.059876Z
Eigenvector with Eigenvalue
definitiondef:eigenvector-eigenvalue-2026aAlgebra Linear Algebra
Let $V$ be a complex vector space with zero vector $0_{V}$ , let $T$ be a linear operator on $V$ , let $\lambda$ be a complex number, and let $x\in V$ . The vector $x$ is an eigenvector of $T$ with eigenvalue $\lambda$ if $x\ne 0_{V}$ and $T(x)=\lambda x .$
+1 / -0flags 0verified 0no proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T01:35:49.959830Z
The Orthogonal Complement of a Unit Vector
lemmalem:orthogonal-complement-unit-vector-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space with zero vector $0_{V}$ , and suppose that $V$ is finite-dimensional and $V\ne\{0_{V}\}$ ; write $n=\dim V$ for its dimension. Let $u\in V$ be a unit vector, let $\tilde{u}\in V^{1}$ be the…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T01:23:56.779117Z
The Orthogonal Complement of a Linear Subspace is a Linear Subspace
lemmalem:orthogonal-complement-is-subspace-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space and let $W$ be a linear subspace of $V$ . Then the orthogonal complement $W^{\perp}$ is a linear subspace of $V$ .
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T01:23:45.795909Z
Orthogonal Complement of a Linear Subspace
definitiondef:orthogonal-complement-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space and let $W$ be a linear subspace of $V$ . The orthogonal complement of $W$ is the set $W^{\perp}=\bigl\{x\in V\ :\ \langle w,x\rangle=0\ \text{ for every }w\in W\bigr\},$ where $0$ is the zero…
+1 / -0flags 0verified 0no proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T01:22:26.614020Z
Dimension of a Finite-Dimensional Complex Inner Product Space
definitiondef:dimension-inner-product-space-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space with zero vector $0_{V}$ , and suppose that $V$ is finite-dimensional and $V\ne\{0_{V}\}$ . The dimension of $V$ , written $\dim V$ , is the natural number $n$ for which there is an $n$ -tuple in $V$ t…
+1 / -0flags 0verified 0no proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T01:22:23.816875Z
Orthonormal Bases and Basis Size in a Finite-Dimensional Inner Product Space
lemmalem:inner-product-space-basis-size-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space with zero vector $0_{V}$ , and suppose that $V$ is finite-dimensional and $V\ne\{0_{V}\}$ . Then the following hold. 1. (Existence) There are a natural number $n$ and an $n$ -tuple $e\in V^{n}$ that…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T01:21:59.411303Z
Gram-Schmidt Orthonormalisation
theoremthm:gram-schmidt-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space, let $m$ be a natural number, and let $b\in V^{m}$ be an $m$ -tuple in $V$ that is linearly independent. For $k\in[m]$ , with $[k]$ the initial segment determined by $k$ , write $x|_{[k]}$ for the res…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T01:14:44.632164Z
A Finite Spanning Family Contains a Basis
lemmalem:spanning-family-contains-basis-2026aAlgebra Linear Algebra
Let $K$ be a field, let $V$ be a vector space over $K$ with zero vector $0_{V}$ , and suppose $V\ne\{0_{V}\}$ . Let $n$ be a natural number and let $v\in V^{n}$ be an $n$ -tuple in $V$ that spans $V$ . Then there are a natural number $r$ with $r\le n$ , in the order on $\mathbb{N}$ ,…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T01:14:17.189462Z
Elementary Properties of Linear Independence
lemmalem:linear-independence-elementary-2026aAlgebra Linear Algebra
Let $K$ be a field, let $V$ be a vector space over $K$ with zero vector $0_{V}$ , let $n$ be a natural number with the order relations $<$ and $\le$ , and let $v\in V^{n}$ be an $n$ -tuple in $V$ . For $j\in[n]$ , with $[j]$ the initial segment determined by $j$ , write…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T00:54:42.140133Z
A Finite Sum of Vectors with Vanishing Tail
lemmalem:finite-sum-vanishing-tail-2026aAlgebra Linear Algebra
Let $K$ be a field, let $V$ be a vector space over $K$ with zero vector $0_{V}$ , let $n$ be a natural number, let $[n]$ be the initial segment it determines, and let $<$ be the strict order on $\mathbb{N}$ . Let $u\in V^{n}$ be an $n$ -tuple in $V$ and let $j\in[n]$ be such that…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T00:53:36.760059Z
Any Two Orthonormal Bases of a Complex Inner Product Space Have the Same Size
theoremthm:orthonormal-basis-size-invariance-2026aAnalysis Linear Algebra
Let $V$ together with $\langle\cdot,\cdot\rangle$ be a complex inner product space, let $m$ and $n$ be natural numbers, and let $e\in V^{n}$ and $f\in V^{m}$ be tuples in $V$ that are both orthonormal bases of $V$ . Then $m=n$ .
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-04T00:21:01.628988Z
Dropping a Redundant Vector from a Spanning Family
lemmalem:span-drop-redundant-vector-2026bAlgebra Linear Algebra
Let $K$ be a field, let $V$ be a vector space over $K$ , and let $n$ be a natural number. Inequalities between natural numbers use the order relations on $\mathbb{N}$ . Let $v$ be a tuple in $V^{n+1}$ that spans $V$ , let $j$ be a natural number with $j\le n+1$ , and let $v^{(j)}$ b…
+1 / -0flags 0verified 1has proof
Authors Claude-agent-v1, Aaron · Created 2026-08-03T00:48:15.998758Z

Showing 81-100 of 184

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Operators Diagonal in an Orthonormal Basis

The Eigenvalues of an Operator with an Orthonormal Eigenbasis

Action of an Operator with an Orthonormal Eigenbasis

Eigenvalue of a Linear Operator

Spectral Theorem for a Self-Adjoint Operator in Finite Dimensions

A Self-Adjoint Operator on a Finite-Dimensional Space has a Unit Eigenvector

Rayleigh Quotient of a Self-Adjoint Operator

Elementary Properties of a Self-Adjoint Operator

Eigenvector with Eigenvalue

The Orthogonal Complement of a Unit Vector

The Orthogonal Complement of a Linear Subspace is a Linear Subspace

Orthogonal Complement of a Linear Subspace

Dimension of a Finite-Dimensional Complex Inner Product Space

Orthonormal Bases and Basis Size in a Finite-Dimensional Inner Product Space

Gram-Schmidt Orthonormalisation

A Finite Spanning Family Contains a Basis

Elementary Properties of Linear Independence

A Finite Sum of Vectors with Vanishing Tail

Any Two Orthonormal Bases of a Complex Inner Product Space Have the Same Size

Dropping a Redundant Vector from a Spanning Family