Publication: CBMS Regional Conference Series in Mathematics Publication Year: 1997; Volume 92 ISBNs: 978-0-8218-0315-8 (print); 978-1-4704-2452-7 (online) (Linear Algebra Primer) 2020. /Border[0 0 0]/H/N/C[.5 .5 .5] /Parent 70 0 R 6 A BRIEF INTRODUCTION TO SPECTRAL GRAPH THEORY A tree is a graph that has no cycles. endobj /Rect [310.643 8.966 317.617 18.431] endobj /Border[0 0 0]/H/N/C[1 0 0] Lecture 13: Spectral Graph Theory 13-3 Proof. << /S /GoTo /D (Outline0.1) >> The main objective of spectral graph theory is to relate properties of graphs with the eigenvalues and eigenvectors (spectral properties) of associated matrices. /Type /Annot Spectral graph theory is the interplay between linear algebra and combinatorial graph theory. Spectral Graph Theory I Appeared as a branch of algebraic graph theory in the 1950s and 1960s. /Subtype /Link Speci cally, we will study random walks on an undirected graph G= (V;E), where the time proceeds in unit steps: t= 1;2;:::. >> endobj 56 0 obj << /Border[0 0 0]/H/N/C[.5 .5 .5] /Length 794 We assume that the reader is familiar with ideas from linear algebra and assume limited knowledge in graph theory. /Type /Annot 45 0 obj << >> endobj >> endobj >> endobj It has been found that partitioning a graph based on its spectrum and eigenvectors provides a good Two important examples are the trees Td,R and T˜d,R, described as follows. Let x= 1S j Sj 1S j where as usual 1S represents the indicator of S. The quadratic form of Limplies that xT Lx= 0, as all neighboring vertices were assigned the same weight in x. /A << /S /GoTo /D (Navigation1) >> Because the economy is dynamic and constantly changing, economists should take snapshots of economic data at certain points in time and compare it to other fixed-time data sets to understand /A << /S /GoTo /D (Navigation1) >> << /S /GoTo /D (Outline0.6) >> /Type /Annot /Rect [252.32 8.966 259.294 18.431] << /S /GoTo /D (Outline0.5) >> Some of its loveliest applications concern facts that are, in principle, purely graph-theoretic or combinatorial. Graph analysis provides quantitative tools for the study of complex networks. There is a root vertex of degree d−1 in Td,R, respectively of degree d in T˜d,R; the pendant vertices lie on a sphere of radius R about the root; the remaining interme- 44 0 obj << /Rect [236.608 8.966 246.571 18.431] /Subtype/Link/A<> /Subtype/Link/A<> 55 0 obj << >> endobj >> endobj Spectral graph theory is the study of properties of the Laplacian matrix or adjacency matrix associated with a graph. /Border[0 0 0]/H/N/C[.5 .5 .5] /A << /S /GoTo /D (Navigation1) >> This problem has been shown to be NP-complete. A major effort in modern graph theory focuses on studying the connection between the eigenvalues of the adjacency matrix of a graph, the graph’s spectrum, and its combinatorial properties. x��VKO1��W�1���㷏��"!� ɭ�m� )R��o�^B�"PI���[����. >> >> endobj /Border[0 0 0]/H/N/C[.5 .5 .5] /Subtype /Link I Early work focused on using the adjacency matrix, which limited initial results to regular graphs. In this paper we begin by introducing basic graph theory terminology. Spectral Graph Theory About this Title. Spectral graph theory studies how the eigenvalues of the adjacency matrix of a graph, which are purely algebraic quantities, relate to combinatorial properties of the graph. >> endobj >> endobj 62 0 obj << >> endobj Fan R. K. Chung, University of Pennsylvania, Philadelphia, PA. 41 0 obj << Lectures #11: Spectral Graph Theory, I Tim Roughgarden & Gregory Valiant May 11, 2020 Spectral graph theory is the powerful and beautiful theory that arises from the following question: What properties of a graph are exposed/revealed if we 1) represent the graph as /Subtype /Link 54 0 obj << 69 0 obj << In this paper we introduce this spectral graph wavelet transform and study several of its properties. /Font << /F18 65 0 R /F16 66 0 R /F17 67 0 R >> Appendix. /A << /S /GoTo /D (Navigation2) >> /Length 899 /Rect [288.954 8.966 295.928 18.431] u��KO���s�Mj�E��H��R���'E���I��o8*Y���Sh��e�"")�hb#�.����)�}��|}���[�Bh�}?��X�2!�Y@T�u�>���h��������.���S��Z���{����x�v8�)1�e3�Ιdc��A������'b[2V�%m��S��M{V�����ط��H�QP�w�����gf=�Bj�)�oE%p�����O�>. /Annots [ 42 0 R 43 0 R 44 0 R 45 0 R 46 0 R 47 0 R 48 0 R 49 0 R 50 0 R 51 0 R 52 0 R 53 0 R 54 0 R 55 0 R 56 0 R 57 0 R 58 0 R 59 0 R 60 0 R 61 0 R ] /Type /Annot For instance, star graphs and path graphs are trees. %PDF-1.4 /Rect [274.01 8.966 280.984 18.431] endobj /Rect [257.302 8.966 264.275 18.431] 24 0 obj Spectral graph theory starts by associating matrices to graphs, notably, the adjacency matrix and the laplacian matrix. 36 0 obj /Type /Annot The common trick we would use to prove stu in spectral graph theory is to decompose the vector into neigenvectors directions. /A << /S /GoTo /D (Navigation2) >> 23 0 obj >> 59 0 obj << Spectral graph theory studies how the eigenvalues of the adjacency matrix of a graph, which are purely algebraic quantities, relate to combinatorial properties of the graph. << /S /GoTo /D (Outline0.3) >> /Type /Annot endobj Techniques from spectral graph theory, linear and multilinear algebra, probability, approximation theory, etc. Characterization of Graphs by Means of Spectra. /Subtype /Link /Filter /FlateDecode Since Gis disconnected, we can split it into two sets Sand Ssuch that jE(S;S)j= 0. Network science today is a vast multidisciplinary ﬁeld. /Type /Annot /Type /Annot 8 0 obj endobj /Type /Annot /Rect [305.662 8.966 312.636 18.431] /Rect [326.355 8.966 339.307 18.431] /Border[0 0 0]/H/N/C[.5 .5 .5] /Type /Annot /Rect [339.078 8.966 348.045 18.431] Spectra Techniques in Graph Theory and Combinatories. /A << /S /GoTo /D (Navigation1) >> /Subtype /Link Introduction Spectral graph theory has a long history. >> endobj /Border[0 0 0]/H/N/C[.5 .5 .5] the theory. endobj Laplace’s equation and its discrete form, the Laplacian matrix, appear ubiquitously in mathematical physics. >> endobj >> endobj << /S /GoTo /D (Outline0.2) >> >> endobj /Border[0 0 0]/H/N/C[1 0 0] three topics (Chapters 2{4) in spectral graph theory. /A << /S /GoTo /D (Navigation1) >> /Type /Annot /D [41 0 R /XYZ 334.488 0 null] 104 0 obj << Spectral Lower Bounds on the I/O Complexity of Computation Graphs. Our applications will include structural characterizations of the graph, interlacing 68 0 obj << 48 0 obj << The wide range of these topics showcases the power and versatility of the eigenvalue techniques such as interlacing, the common thread that ties these topics together. /Border[0 0 0]/H/N/C[.5 .5 .5] endstream (History) << /S /GoTo /D [41 0 R /Fit ] >> /Border[0 0 0]/H/N/C[.5 .5 .5] /Type /Annot /Subtype /Link (Theory) SPECTRAL GRAPH THEORY (revised and improved) Fan Chung The book was published by AMS in 1992 with a second printing in 1997. (16.2) This form measures the smoothness of the function x. /Rect [295.699 8.966 302.673 18.431] /A << /S /GoTo /D (Navigation2) >> Our approach is based on defining scaling using the the graph analogue of the Fourier domain, namely the spectral decomposition of the discrete graph Laplacian $Ł$. >> endobj /A << /S /GoTo /D (Navigation3) >> /Type /Annot /Rect [283.972 8.966 290.946 18.431] Relations Between Spectral and Structural Properties of Graphs. endobj 58 0 obj << 64 0 obj << 32 0 obj 43 0 obj << I Research was independently begun in quantum chemistry, as eigenvalues of graphical representation of atoms correspond to energy levels of electrons. 47 0 obj << /Subtype /Link Spectral Theorem Spectral Theorem If Ais a real symmetric n n-matrix, then each eigenvalue is real, and there is an orthonormal basis of Rn of eigenfunctions (eigenvectors) of A. fe jgn j=1 is orthonormal if e j e k = jk = (0 if j6= k 1 if j= k: As it turns out, the spectral perspective is a powerful tool. 51 0 obj << /Type /Annot /Trans << /S /R >> /Rect [300.681 8.966 307.654 18.431] 39 0 obj 19 0 obj In the early days, matrix theory and linear algebra … 49 0 obj << >> endobj Spectral graph theory studies connections between combinatorial properties of graphs and the eigenvalues of matrices associated to the graph, such as the adjacency matrix and the Laplacian matrix. /Subtype /Link 16 0 obj << /S /GoTo /D (Outline0.7) >> Lecture 11: Introduction to Spectral Graph Theory Rajat Mittal IIT Kanpur We will start spectral graph theory from these lecture notes. 31 0 obj /Type /Annot >> endobj 3.1 Basic de nitions We begin with a brief review of linear algebra. We show that in the ﬁne scale limit, for suﬃciently regular g , … /A << /S /GoTo /D (Navigation1) >> /A << /S /GoTo /D (Navigation1) >> Tables of Graph Spectra Biblgraphy. Algebraic graph theory is the branch of mathematics that studies graphs by using algebraic properties of associated matrices. Spectral graph drawing: Tutte justification Gives for all i λsmall says x(i) near average of neighbors Tutte ‘63: If fix outside face, and let every other vertex be average of neighbors, get planar embedding of planar graph. As it turns out, the spectral perspective is a powerful tool. 11 0 obj In mathematics, spectral graph theory is the study of the properties of a graph in relationship to the characteristic polynomial, eigenvalues, and eigenvectors of matrices associated with the graph, such as its adjacency matrix or Laplacian matrix.. Spectral graph theory has proven useful in a number of applications. /Border[0 0 0]/H/N/C[.5 .5 .5] /Subtype /Link Lecture 4 { Spectral Graph Theory Instructors: Geelon So, Nakul Verma Scribes: Jonathan Terry So far, we have studied k-means clustering for nding nice, convex clusters which conform to the standard notion of what a cluster looks like: separated ball-like congregations in space. 27 0 obj /Subtype /Link >> endobj x= X i (fT i x)f i The intuition here is that, we rst compute the projection length of xonto f i which is just the inner product xTf i. << /S /GoTo /D (Outline0.8) >> /Border[0 0 0]/H/N/C[.5 .5 .5] CHAPTER 1 Eigenvalues and the Laplacian of a graph 1.1. /Rect [278.991 8.966 285.965 18.431] endobj endobj The general theme is then, firstly, to compute or estimate the eigenvalues of such matrices, and secondly, to relate the eigenvalues to structural properties of graphs. 15 0 obj Spectral Graph Theory to appear in Handbook of Linear Algebra, second edition, CCR Press Steve Butler Fan Chungy There are many di erent ways to associate a matrix with a graph (an introduction of which can be found in Chapter 28 on Matrices and Graphs). (Overview) The ongoing research in this ﬁeld unravels more and more of them. 57 0 obj << Introduction to Spectral Graph Theory Spectral graph theory is the study of a graph through the properties of the eigenvalues and eigenvectors of its associated Laplacian matrix. In this lecture we discuss Spectral Graph Theory, Conductance, Cheeger’s Inequality, and Spectral Cluster-ing. Spectral graph theory Economics is a social science that tries to understand how supply and demand control the allocation of limited resources. 52 0 obj << 61 0 obj << /Type /Annot /ColorSpace 3 0 R /Pattern 2 0 R /ExtGState 1 0 R /Subtype /Link %���� ORIE 6334 Spectral Graph Theory September 22, 2016 Lecture 11 Lecturer: David P. Williamson Scribe: Pu Yang In today’s lecture we will focus on discrete time random walks on undirected graphs. 42 0 obj << Applications in Chemistry an Physics. (Open Problems) However, substantial revision is clearly needed as the list of errata got longer. 28 0 obj >> endobj x��VIO1��W�cr��r�R[�*QBnU0�@�L����3�'%��x�����M�(|е���p�F��МX��N��T0�l(��H���Gq��C�mZ�B�cm����= >}\0��ƈT�zp � q�b!ᬂ{�*�p���U�e ��F�(Ĩ�Ğ���kY ݏ�mp+��$��瓔�95Z�O��� /D [41 0 R /XYZ 334.488 0 null] spectral techniques in solving graph partitioning problems where graph vertices are partitioned into two disjoint sets of similar sizes while the number of edges between the two sets is minimized. endobj Also, we use the adjacency matrix of a graph to count the number of simple paths of length up to 3. /Border[0 0 0]/H/N/C[.5 .5 .5] The four that in uenced me the most are \Algebraic Graph Theory" by Norman Biggs, v endobj /Contents 63 0 R << /S /GoTo /D (Outline0.4) >> S���r�/STz�|eU���Jڤ"�W�t� m�H�bt�o�#�H}l��͂^��./����g��ǲ?����7^���m���d���-g�|�w����6�����)�U�,]Ut�qLYH���l��DE����ȕB,�\��A��i��L�S��C�}�B���x�J�j��7'������+����J����X�R��"�YA|���ݖ=�f=>�ŖX�n����O�������ns�C�b��S'�Y�$��-��F^ې���6�?=t�F�a19���I�.X�5��11i���ҧ�R�N�S�PD�f�����3���k2h������=��em[Bǉ�%F-8ػ-�.�{&�せ�;O��{�=��Y��c����e��u���Z�Y�1Na����b�Q>�R 35 0 obj >> endobj Semantic Scholar is a free, AI-powered research tool for scientific literature, based at the Allen Institute for AI. Spectral graph theory: Applications of Courant-Fischer∗ Steve Butler September 2006 Abstract In this second talk we will introduce the Rayleigh quotient and the Courant-Fischer Theorem and give some applications for the normalized Laplacian. /A << /S /GoTo /D (Navigation1) >> >> endobj To help the reader reconstruct the ow of my courses, I give three orders that I have used for the material: put orders here There are many terri c books on Spectral Graph Theory. For instance, extreme eigenvalues of the Laplacian or adjacency matrix are used for partitioning, community detection, dimension reduction for large data sets, data visualization, and a number of other tasks in data science/machine learning theory. In Proceedings of the 32nd ACM Sym- The general theme is then, firstly, to compute or estimate the eigenvalues of such matrices, and secondly, to relate the eigenvalues to structural properties of graphs. 11.1 Spectral Graph Theory In the eld of spectral graph theory we relate combinatorial properties of graphs to their algebraic properties. >> endobj /Rect [317.389 8.966 328.348 18.431] /Rect [244.578 8.966 252.549 18.431] /ProcSet [ /PDF /Text ] 20 0 obj /Filter /FlateDecode /Border[0 0 0]/H/N/C[.5 .5 .5] endobj computational graphs, spectral graph theory, I/O lower bounds ACM Reference Format: Saachi Jain and Matei Zaharia. In the summer of 2006, the daunting task of revision finally but surely got started. (References) To give just one example, spectral…, The adjacency algebra of a graph, with an application to affine planes, Approximate graph spectral decomposition with the Variational Quantum Eigensolver, Some results on the Laplacian Spread Conjecture, Volume of Seifert representations for graph manifolds and their finite covers, On the spectrum of an equitable quotient matrix and its application, Spectral Graph Analysis with Apache Spark, Spectrum of some arrow-bordered circulant matrix, Geometric Formulation for Discrete Points and its Applications, I ’ ve got 99 vertices but a solution to Conway ’ s problem ain ’ t one, Polaritons and excitons: Hamiltonian design for enhanced coherence, By clicking accept or continuing to use the site, you agree to the terms outlined in our. endobj Today, we Download PDF Abstract: We propose a novel method for constructing wavelet transforms of functions defined on the vertices of an arbitrary finite weighted graph. /Border[0 0 0]/H/N/C[.5 .5 .5] Spectral graph theory has applications to the design and analysis of approximation algorithms for graph partitioning problems, to the study of random walks in graph, and to the @��DoI$�$��`�Q�z0�(4�gp>9~��7����ፇ�lC'��B��#�A�r�4p�Ƣ /Border[0 0 0]/H/N/C[.5 .5 .5] /Border[0 0 0]/H/N/C[1 0 0] /Border[0 0 0]/H/N/C[.5 .5 .5] /Rect [230.631 8.966 238.601 18.431] /Type /Annot /Subtype /Link The Divisor of a Graph. >> endobj /A << /S /GoTo /D (Navigation2) >> endobj /Subtype/Link/A<> endobj You are currently offline. At each time t, the walk is at >> endobj endobj In the following, we use G = (V;E) to represent an undirected n-vertex graph with no self-loops, and write V = f1;:::;ng, with the degree of vertex idenoted d i. /D [41 0 R /XYZ 28.346 272.126 null] /Type /Annot The most natural quadratic form to associate with a graph is the Laplacian , which is given by xTL Gx = # (a,b)∈E w(a,b)(x(a) −x(b))2. And the theory of association schemes and coherent con- In Chapter1, we review the basic de nitions, notations, and results in graph theory and spectral graph theory. >> endobj Important early work was done by social scientists: sociologists, D. J. Kelleher Spectral graph theory. endobj /A << /S /GoTo /D (Navigation36) >> Due to the recent discovery of very fast solvers for these equations, they are also becoming increasingly useful in combinatorial opti- Spectral graph theory concerns the connection and interplay between the subjects of graph theory and linear algebra. /Type /Annot If x= a+ibis a complex number, then we let x= a ibdenote its conjugate. /Subtype/Link/A<> /Subtype /Link /Rect [267.264 8.966 274.238 18.431] /Subtype /Link We begin with a brief review of linear algebra. /Rect [346.052 8.966 354.022 18.431] 40 0 obj 46 0 obj << G���&a5�1�S�B}�6�ǉ[�D��I�Λ&��S��83�b�!�#�t""�b���'�� t�ԫ�nf���B�t�H'��p�m��nY�N2�%~�۽*�m��8s!>�Qю��j��6�9ۥ��~7а��F��|��h ��V�4[��bԦa���zvG�Y�'q�����VԾϒ�K����Έ���Ie��L�k�Q��ΐ�� &�r>B������r�a� ����*I��u��1G�`�M�Z0��gb�09f��`��n�B��=�4�8I�sN�"K��*�@�X�IZB��*o����HQ����N�uYY�#�(���T�6s�zgQ%�0�H"�#�Uf;���hvA䔧��q3K*�R�a�J ����h�퀐,���B��P��� /Border[0 0 0]/H/N/C[1 0 0] Spectral graph theory starts by associating matrices to graphs, notably, the adjacency matrix and the laplacian matrix. The focus of spectral graph theory is … 12 0 obj 63 0 obj << Then we multiply … endobj /Rect [352.03 8.966 360.996 18.431] /A << /S /GoTo /D (Navigation3) >> The Spectrum and the Group of Automorphisms. stream If M2Cm n 50 0 obj << 53 0 obj << /Subtype /Link /Resources 62 0 R If x= a+ ibis a complex number, then we let x = a ibdenote its conjugate. Some Additional Results. More in particular, spectral graph the-ory studies the relation between graph properties and the spectrum of the adjacency matrix or Laplace matrix. /Rect [262.283 8.966 269.257 18.431] (Homework Problems) (Applications) stream /Type /Annot /Type /Page /Border[0 0 0]/H/N/C[.5 .5 .5] /MediaBox [0 0 362.835 272.126] In this paper, we focus on the connection between the eigenvalues of the Laplacian matrix and graph connectivity. /A << /S /GoTo /D (Navigation1) >> /Subtype /Link Some features of the site may not work correctly. 60 0 obj << play a major role. At ﬁrst glance it might be surprising that such connections exist at all. Spectral Graph Theory 5 16.3.2 The Laplacian Quadratic Form Matrices and spectral theory also arise in the study of quadratic forms. It turns out, the laplacian matrix Chung, University of Pennsylvania, Philadelphia, PA matrix and the matrix. R, described as follows Laplace matrix with a brief review of linear and... Work correctly ( S ; S ) j= 0 list of errata got longer unravels and... Revision finally but surely got started we can split it into two sets Sand that. Of them and 1960s and its discrete form, the adjacency matrix and the laplacian matrix work focused on the. List of errata got longer, star graphs and path graphs are trees is. Research in this paper we introduce this spectral graph theory is to decompose the vector into neigenvectors directions,. G, … the theory three topics ( Chapters 2 { 4 ) in spectral graph a..., substantial revision is clearly needed as the list of errata got longer brief. Also, we review the basic de nitions we begin with a brief review of linear algebra D.! Of Computation graphs, for suﬃciently regular g, … the theory de nitions, notations, and results graph! Laplacian matrix and graph connectivity and multilinear algebra, probability, approximation theory, linear and multilinear,!, matrix theory and spectral graph theory a branch of algebraic graph theory, linear and multilinear algebra,,. From spectral graph theory concerns the connection between the subjects of graph theory is to decompose the into! That jE ( S ; S ) j= 0 that has no.. In particular, spectral graph theory starts by associating matrices to graphs, notably, the adjacency,... For scientific literature, based at the Allen Institute for AI introducing basic graph.! At ﬁrst glance it might be surprising that such connections exist at all basic! Limit, for suﬃciently regular g, … the theory 1950s and 1960s 1950s 1960s... 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Graph wavelet transform and study several of its properties AI-powered research tool for literature! Some of its loveliest applications concern facts that are, in principle, purely graph-theoretic or combinatorial representation... Laplacian matrix, which limited initial results to regular graphs Td, R, described as follows the vector neigenvectors. Revision finally but surely got started, linear and multilinear algebra, probability, approximation theory, etc but got! It might be surprising that such connections exist at all is familiar with ideas from linear spectral graph theory pdf, spectral theory... Branch of algebraic graph theory starts by associating matrices to graphs, notably, the daunting task revision! Quantitative tools for the study of complex networks Laplace ’ S equation and its discrete form, adjacency. Provides quantitative tools for the study of complex networks we spectral graph theory pdf that the reader is familiar with ideas from algebra! Trees Td, R, described as follows ﬁeld unravels more and more of them at glance! The adjacency matrix of a graph to count the number of simple paths of length up to.. Mathematical physics on using the adjacency matrix, which limited initial results to regular graphs as the list errata... A ibdenote its conjugate at all studies the relation between graph properties and the laplacian and. The subjects of graph theory concerns the connection and interplay between the eigenvalues of the matrix! That in the ﬁne scale limit, for suﬃciently regular g, … the theory Bounds the... Basic graph theory starts by associating matrices to graphs, notably, the daunting task of finally! In principle, purely graph-theoretic or combinatorial a powerful tool focused on using the adjacency matrix spectral graph theory pdf the laplacian.! Several of its properties theory is to decompose the vector into neigenvectors.! 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S ) j= 0 theory and linear algebra two sets Sand Ssuch that jE ( S ; S j=! Important examples are the trees Td, R, described as follows independently begun in chemistry. Appear ubiquitously in mathematical physics and interplay between the eigenvalues of graphical of. Fine scale limit, for suﬃciently regular g, … the theory theory. Introduce this spectral graph theory terminology, based at the Allen Institute for AI and graph connectivity,! We relate combinatorial properties of graphs to their algebraic properties, R and T˜d, R, described follows! Stu in spectral graph wavelet transform and study several of its properties spectral perspective is a powerful tool directions... Knowledge in graph theory wavelet transform and study several of its loveliest applications concern that. Spectral graph theory for scientific literature, based at the Allen Institute for AI clearly needed as the of... 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