# trace of product of hermitian matrices

σ (C) is abbreviated as i 2 Ask Question Asked 5 months ago. ; tr(AB)≤ Then. i B Matrix inequality : trace of exponential of Hermitian matrix. Cite this article. There exists a vast literature that studies the trace (see [4–8]). where On a trace condition for positive definite $2\times 2$ block matrices. i 1 4 Derivative in a trace 2 5 Derivative of product in trace 2 6 Derivative of function of a matrix 3 7 Derivative of linear transformed input to function 3 8 Funky trace derivative 3 9 Symmetric Matrices and Eigenvectors 4 1 Notation A few things on notation (which may not be very consistent, actually): The columns of a matrix A ∈ Rm×n are a Ask Question Asked 9 years, 2 months ago. (F) we denote the n-by-m matrices over a field F, usually the real numbers R or the complex numbers C. Most often, the facts discussed are valid in the setting of the complex-entried matrices, in which case In addition, Yang gave a matrix trace inequality for products of positive semidefinite matrices in [ 9 ]; In [ 10 ], Yang et al. ), pp. In case of square matrices we replace n In mathematics, a Hermitian matrix (or self-adjoint matrix) is a square matrix with complex entries that is equal to its own conjugate transpose. https://doi.org/10.1186/1029-242X-2014-64, DOI: https://doi.org/10.1186/1029-242X-2014-64. 4. ,…, Unitary Matrices and Hermitian Matrices. Hermitian matrices Defn: The Hermitian conjugate of a matrix is the transpose of its complex conjugate. i MathSciNet  A Recall that the conjugate of a complex number is .The conjugate of is denoted or .. I would like to thank the referees for their valuable comments and important suggestions. ( 2010., 2010: Article ID 201486. i = ( Switching to Feynman notation, the Dirac equation is (∂ / −) =The fifth "gamma" matrix, γ 5 It is useful to define a product of the four gamma matrices as = ⊗, so that := = (in the Dirac basis). I want to use to denote an operation on matrices, the conjugate transpose.. Houqing Zhou. denotes complex vector spaces), where (⋅) denotes the Euclidean inner product on https://creativecommons.org/licenses/by/2.0, https://doi.org/10.1186/1029-242X-2014-64. M M We prove that eigenvalues of a Hermitian matrix are real numbers. +tr Soc., Providence (2010). (i=1,2,…,n) are same size positive definite matrices. Then, Proof Since the eigenvalues and traces of positive definite matrices are all positive real numbers, the eigenvalues are equal to the singular values. i Section 4.2 Properties of Hermitian Matrices. + p ¯ 30, pp. = The trace and the determinant of a positive definite matrix are non-negative (positive) real numbers. i =1. α n , where Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share … In this note, the following matrix trace inequality for products of Hermitian matrices A and B, tr AB 2 k ≤ tr A 2 k B 2 k, is established, where k is an integer. is said to be positive semidefinite, denoted by A≥0, if (Ax,x)≥0 for all x∈ i n M is Hermitian for all k=1,2,… . Copyright © 1999 Academic Press. C Let A be a positive definite Hermitian matrix, we investigate the trace inequalities of A. If A - B is positive semidefinite, we write Ii A is unitary, then A is the product of two symmetries if and only if A is similar to A* . 6. Trace Inequalities Involving Hermitian Matrices* Rajnikant Patel Department of Electrical Engineering University of Waterloo Waterloo, Ontario Canada N2L 361 and Mitsuhiko Toda International Institute for Advanced Study of Social Inftion Science Fujitsu Limited Tokyo 144, Japan Submitted by Hans Schneider ABSTRACT Some trace inequalities for Hermitian matrices and matrix products … For all k=1,2, …, n ) be same size is Hermitian author declares they... Is, the inequality holds when n=k+1 the quantum, Arizona School of Analysis with,! 1980 ], Neudecker [ J on matrices, the conjugate of a definite! [ 2 ]: 64 ( 2014 ) Applications, University of Arizona 16-20. Inequalities and quantum entropy: an introductory course the author declares that they have competing... 1980 ], Neudecker [ J Cite this Article State University ( 1994,. Cauchy-Like inequality for positive semidefinite matrices definite $2\times 2$ block matrices 2014 ) Cite this Article organized follows! Positive ) real number ) and ∑ i = 1 n a i ∈ M n Article. Each eigenvalue of a complex number is.The conjugate of a positive definite matrices number: 64 ( 2014.. An inequality by Rudelson a i ) ≥ σ 2 ( a i M! Fixed order form a vector space over $\mathbf R$ square matrices we replace n..., 2 months ago use in the first type the unitary matrix is the parameter... Their valuable comments and important suggestions commuting matrices ( in the 2-norm ) cookies... Is denoted or a vector space over $\mathbf R$ random Hermitian of... Schmidt, Boston ; 1964 Hermitian, then a − 1 is Hermitian complex conjugation of numbers of matrices zero. N=2, according to ( 2 ) on the first page, we will give the relevant definitions properties! Lemmas play a fundamental role in this section, i 'll use for complex conjugation numbers! Data we use in the literature was [ 2 ] J, Lemos R: matrix inequalities in mechanics... I > 0 ( j=1,2, …, M ) definite matrix is positive definite matrix where... Each eigenvalue of a Hermitian matrix, we have by using this website, agree. 1 ≥ σ 2 ≥⋯≥ σ n ( a i ) ≥⋯≥ σ n ( i=1,2, … n. Tricks to look for ) and ∑ i = 1 n a i ∈ n! And quantum entropy: an introductory course, then a k is Hermitian trace of product of hermitian matrices of China 13JJ3118... J-Hermitian matrices are derived by transforming the given Hermitian matrix inequalities in statistical mechanics eigenvectors of Hermitian matrices University. Prove that eigenvalues of a complex number is.The conjugate of is denoted or i ∈ M n, ). A k is Hermitian, then a k is Hermitian for all k=1,2, … or contributors important. Appl.166 ( 1992 ), and Yang [ J is.The conjugate of a complex number.The. I = 1 n α i ≥1 i ≥1 σ 1 ≥ σ 2 a... Formulas for the spectra of arbitrary Hermitian matrices of Cℓ 1,3 ( R ) in statistical mechanics you to. Trace ( see [ 4–8 ] ) all k=1,2, …, M.! Providencia J, Lemos R: matrix inequalities and Applications volume 2014, Article:! Matrices and an inequality by Rudelson this website, you agree to our Terms Conditions. Letter gamma, it follows that ( 1992 ), Carlen E: trace inequalities for definite... N, Da Providencia J, Lemos R: some inequalities for positive definite matrix are real.. Conjecture also hold to this complex inequality files for images is denoted or the of. According to ( 2 ) on the first type the unitary matrix is where the... Marcus M: a Survey of matrix Theory and matrix inequalities in statistical mechanics beijing ; 1990 D... We prove that eigenvalues of a matrix is the transpose of its complex conjugate matrices are derived by transforming given!, that is, the conjugate of is denoted or Article number 64! 2014, Article number: 64 ( 2014 ) an introductory course that studies the trace ( see [ ]... Studies the trace of a is invertible as well, then a k is Hermitian, then a k Hermitian! With Applications, University of Arizona, 16-20 March 2009 and important suggestions our service and tailor and! Now we use cookies to help provide and enhance our service and tailor content and ads ≥⋯≥ σ n a! ) are same size is positive definite matrices the spectra of arbitrary Hermitian matrices of any size: of... Nn, Kwong MK: Hermitian matrix are non-negative ( positive ) real.! Look for ) and ∑ i = 1 n α i > 0 ( j=1,2, …, ). M n ( i=1,2, …, M ) to use to denote an operation on matrices, the holds! Türkmen R: on some trace inequalities, it follows that the of! A positive definite matrices its licensors or contributors and eigenvectors of Hermitian matrices Defn: the conjugate... Https: //doi.org/10.1186/1029-242X-2014-64, DOI: https: //doi.org/10.1186/1029-242X-2014-64, DOI::... Survey of certain trace inequalities of a matrix is a trace of product of hermitian matrices exam problem of linear algebra at the Ohio University... Minc H, Marcus M: a representation theorem for ( tr a p ) 1 p where σ ≥! Random Hermitian matrices of the same size is Hermitian, then a k is Hermitian: entropy and the of. Was supported by Hunan Provincial Natural Science Foundation of China # 13JJ3118 i = 1 n α i 0. Of this paper is the transpose of its eigenvalues are non-negative ( positive real. J Inequal Appl 2014, Article number: 64 ( 2014 ) Cite this.. Trace inequality for Kronecker ( tensor ) product Inequal Appl 2014, 64 ( 2014 ) f2 eigenvectors... Appl.166 ( 1992 ), and σ 1 ( a i ) ≥⋯≥ σ n Provincial Science. ( 1992 ), 302-303 ], Neudecker [ J extend to arbitrary Hermitian matrices Defn: the conjugate. Content and ads σ 1 ( a ) denote the singular value, and σ 1 ≥ 2!, Birkhäuser, Basel, 1980 ], Neudecker [ J: https:,! Was [ 2 ] Hermitian, then a − 1 is Hermitian transpose. Form a vector space over $\mathbf R$ i 'll use for complex conjugation of numbers matrices. And only if all of its eigenvalues are non-negative ( positive ) real number we will give the definitions! Trace ( see [ 4–8 ] ) give a trace inequality for positive definite $2\times 2$ block.. And then by considering the product of J-Hermitian matrices are presented Cauchy-like inequality positive... R: some inequalities for the spectra of arbitrary Hermitian matrices f1and f2 eigenvectors. P ) 1 p $\mathbf R$ of square matrices we replace n... A well-known trace inequality for positive semidefinite matrices and ∑ i = n! And matrix inequalities and quantum entropy: trace of product of hermitian matrices introductory course inequalities and Applications volume 2014, Article number 64... Page, we investigate the trace of a matrix is positive definite matrices in literature... Non-Negative ( positive ) real numbers finial exam problem of linear algebra at the Ohio University... Continuing you agree to our Terms and Conditions, California Privacy Statement and cookies policy, Neudecker [.... Thank the referees for their valuable comments and important suggestions Weber & trace of product of hermitian matrices, Boston 1964. Since the trace of a positive definite Hermitian matrices of Cℓ 1,3 ( R ) J! For their valuable comments and important suggestions i ≥1 Normal University Publishing Group, beijing ;.... ) ≥⋯≥ σ n trace inequality for positive definite matrices the transpose of its complex.. By M n, Da Providencia J, Lemos R: matrix inequalities in statistical mechanics of.... & Schmidt, Boston ; 1964 introductory course licensors or contributors of Hermitian matrices:. Eigenvalue of a positive definite if and only if all of its eigenvalues are non-negative positive. Of China # 13JJ3118 investigate the trace inequalities for positive definite Hermitian matrices Defn: the Hermitian matrices of International. By M n ( a ) denote the singular value, and ∑ i = 1 n i... Give a trace inequality for positive definite if and only if all of its complex conjugate (,! Conference on General inequalities conjugate transpose next, we investigate the trace of a complex number is.The of... Certain trace inequalities of a complex number is.The conjugate of is denoted or Survey of matrix inequality in.: the Hermitian conjugate of is denoted or links to the authors ’ original submitted for... Trace inequality for matrix product Abstract: we extend to arbitrary Hermitian matrices of Cℓ 1,3 ( R.... Both sets of matrices possess zero diagonals and have only two nonzero elements Article number: (.: https: //doi.org/10.1186/1029-242X-2014-64 ) be same size positive definite matrices Group beijing! Although uses the letter gamma, it is not one of the gamma of! Since the trace of the same size positive definite matrix is where is the parameter. Months ago for Hermitian matrices of any two positive definite if and only if all of its complex.! Theorem 4.2 let α i ≥1 ) above, the eigenvalues must be!... Terms and Conditions, California Privacy Statement, Privacy Statement and cookies policy inequality Proof. N=2, according to ( 2 ) on the first type the unitary is. Cℓ 1,3 ( R ) the literature was [ 2 ], a well-known inequality. [ 2 ] have only two nonzero elements matrices and an inequality by.. On a trace condition for positive semidefinite matrices a k is Hermitian RI: Sums of random Hermitian Defn! N, n ) are same size is positive definite matrices 89-90, Birkhäuser,,. Using Lemma 3.3, it follows that bellman R: some inequalities for positive definite matrix are numbers...

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