Pinboard (cshalizi) https://pinboard.in/u:cshalizi/public/ recent bookmarks from cshalizi Large Deviations for Subgraphs in Inhomogeneous Random Graphs | Journal of Statistical Physics | Springer Nature Link 2026-06-25T18:24:18+00:00 https://link.springer.com/article/10.1007/s10955-026-03647-6 cshalizi to:NB large_deviations graph_theory graph_limits https://pinboard.in/ https://pinboard.in/u:cshalizi/b:b8c7a77f8a95/ [math/0504472] Szemerédi's regularity lemma revisited 2026-04-08T02:30:02+00:00 https://arxiv.org/abs/math/0504472 cshalizi have_read tao.terence graph_theory information_theory probability coarse_graining sufficiency in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:b71042d4baec/ [2512.02208] Projective limits of probabilistic symmetries and their applications to random graph limits 2025-12-06T14:27:58+00:00 https://arxiv.org/abs/2512.02208 cshalizi to:NB graph_theory graph_limits point_processes symmetry to_read krioukov.dmitri https://pinboard.in/ https://pinboard.in/u:cshalizi/b:6f35f1d08be2/ [2212.01987] Fractal dimensions for Iterated Graph Systems 2025-12-03T20:39:06+00:00 https://arxiv.org/abs/2212.01987 cshalizi to:NB fractals networks graph_theory re:fractal_network_asymptotics to_read scooped? via:vaguery https://pinboard.in/ https://pinboard.in/u:cshalizi/b:0d244921ef96/ [2503.18823] Coarse-graining Directed Networks with Ergodic Sets Preserving Diffusive Dynamics 2025-03-31T23:42:53+00:00 https://arxiv.org/abs/2503.18823 cshalizi to:NB networks graph_theory https://pinboard.in/ https://pinboard.in/u:cshalizi/b:b70e1137cb6c/ [2310.12397] GPT-4 Doesn't Know It's Wrong: An Analysis of Iterative Prompting for Reasoning Problems 2023-11-16T02:56:12+00:00 https://arxiv.org/abs/2310.12397 cshalizi large_language_models_(so_called) artificial_intelligence graph_theory in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:f2b855eb672f/ [2305.12470] Quasi-Monte Carlo Graph Random Features 2023-05-28T13:45:37+00:00 https://arxiv.org/abs/2305.12470 cshalizi random_features network_data_analysis monte_carlo graph_theory to_read re:codename:catherine_wheel in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:98485ad59efc/ Strong connectivity in real directed networks | PNAS 2023-03-21T15:38:23+00:00 https://www.pnas.org/doi/10.1073/pnas.2215752120 cshalizi to:NB percolation_theory graph_theory networks https://pinboard.in/ https://pinboard.in/u:cshalizi/b:4e85d56f5328/ The Mathematics of Finite Networks 2022-07-02T13:41:39+00:00 https://www.cambridge.org/core/books/mathematics-of-finite-networks/E8CB5F1654ABC535D5A6A191BCF157F1#fndtn-information cshalizi to:NB graph_theory mathematics books:noted downloaded https://pinboard.in/ https://pinboard.in/u:cshalizi/b:4b9ebeb4b38e/ [2202.01563] On the Number of Graphs with a Given Histogram 2022-06-15T18:55:42+00:00 https://arxiv.org/abs/2202.01563 cshalizi to:NB graph_theory graph_limits probability combinatorics https://pinboard.in/ https://pinboard.in/u:cshalizi/b:976d4ca4d910/ [2203.07230] Laplacian Renormalization Group for heterogeneous networks 2022-06-06T12:56:59+00:00 https://arxiv.org/abs/2203.07230 cshalizi to:NB renormalization graph_theory network_data_analysis https://pinboard.in/ https://pinboard.in/u:cshalizi/b:9aea199820a2/ [2201.04888] Generating graphs randomly 2022-03-13T18:10:00+00:00 https://arxiv.org/abs/2201.04888 cshalizi in_NB graph_sampling graph_theory via:vaguery https://pinboard.in/ https://pinboard.in/u:cshalizi/b:a26a182d85d7/ [2103.04668] The distance backbone of complex networks 2021-05-14T01:54:54+00:00 https://arxiv.org/abs/2103.04668 cshalizi to:NB network_data_analysis robustness graph_theory rocha.luis_m. https://pinboard.in/ https://pinboard.in/u:cshalizi/b:112f46a8d854/ [2105.03122] From Graph Centrality to Data Depth 2021-05-10T22:51:17+00:00 https://arxiv.org/abs/2105.03122 cshalizi to:NB graph_theory data_analysis statistics https://pinboard.in/ https://pinboard.in/u:cshalizi/b:ed8fb8095e49/ Model Reduction Methods for Complex Network Systems | Annual Review of Control, Robotics, and Autonomous Systems 2021-05-06T13:48:38+00:00 https://www.annualreviews.org/doi/abs/10.1146/annurev-control-061820-083817 cshalizi to:NB dynamical_systems networks dimension_reduction graph_theory https://pinboard.in/ https://pinboard.in/u:cshalizi/b:b03640a0c4ff/ Factor Graphs: Exploiting Structure in Robotics | Annual Review of Control, Robotics, and Autonomous Systems 2021-05-06T13:47:56+00:00 https://www.annualreviews.org/doi/abs/10.1146/annurev-control-061520-010504 cshalizi to:NB optimization graph_theory https://pinboard.in/ https://pinboard.in/u:cshalizi/b:1ceac07582ac/ [1411.0650] Proof of the satisfiability conjecture for large k 2021-04-16T19:40:35+00:00 https://arxiv.org/abs/1411.0650 cshaliziα∗. We show that the threshold α∗(k) is given explicitly by the one-step replica symmetry breaking prediction from statistical physics. The proof develops a new analytic method for moment calculations on random graphs, mapping a high-dimensional optimization problem to a more tractable problem of analyzing tree recursions. We believe that our method may apply to a range of random CSPs in the 1-RSB universality class."]]> to:NB graph_theory computational_statistics theoretical_computer_science sly.allan probability https://pinboard.in/ https://pinboard.in/u:cshalizi/b:ed405ee4aa25/ [2103.11818] Higher-order Homophily is Combinatorially Impossible 2021-03-26T20:04:15+00:00 https://arxiv.org/abs/2103.11818 cshalizi to:NB graph_theory combinatorics social_networks homophily kleinberg.jon https://pinboard.in/ https://pinboard.in/u:cshalizi/b:7111587a8a4c/ [2102.02653] Typicality and entropy of processes on infinite trees 2021-02-05T20:10:31+00:00 https://arxiv.org/abs/2102.02653 cshalizi to:NB stochastic_processes graph_theory information_theory https://pinboard.in/ https://pinboard.in/u:cshalizi/b:88b975c9c1fd/ Phys. Rev. E 103, 012309 (2021) - Random graphs with arbitrary clustering and their applications 2021-01-27T15:10:56+00:00 https://journals.aps.org/pre/abstract/10.1103/PhysRevE.103.012309 cshalizi to:NB network_data_analysis graph_theory to_read to_teach:baby-nets https://pinboard.in/ https://pinboard.in/u:cshalizi/b:08c135eafbad/ now publishers - Data Analytics on Graphs Part II: Signals on Graphs 2021-01-14T19:21:27+00:00 https://nowpublishers.com/article/Details/MAL-078-2 cshalizi to:NB data_mining graph_theory network_data_analysis fourier_analysis https://pinboard.in/ https://pinboard.in/u:cshalizi/b:2f8de14b2961/ now publishers - Data Analytics on Graphs Part I: Graphs and Spectra on Graphs 2021-01-14T19:20:33+00:00 https://nowpublishers.com/article/Details/MAL-078-1 cshalizi to:NB graph_theory data_mining network_data_analysis spectral_methods https://pinboard.in/ https://pinboard.in/u:cshalizi/b:bfd5d06856f6/ [2101.03618] Network clique cover approximation to analyze complex contagions through group interactions 2021-01-12T21:03:22+00:00 https://arxiv.org/abs/2101.03618 cshalizi to:NB graph_theory epidemics_on_networks https://pinboard.in/ https://pinboard.in/u:cshalizi/b:a0384cca2b54/ [2012.12309] Influence Maximization Under Generic Threshold-based Non-submodular Model 2020-12-26T17:40:14+00:00 https://arxiv.org/abs/2012.12309 cshalizi to:NB social_networks social_influence optimization graph_theory re:do-institutions-evolve https://pinboard.in/ https://pinboard.in/u:cshalizi/b:aafc35a577e2/ [1705.06815] Large deviations for subcritical bootstrap percolation on the random graph 2020-12-16T17:39:38+00:00 https://arxiv.org/abs/1705.06815 cshalizi to:NB epidemics_on_networks stochastic_processes graph_theory large_deviations re:do-institutions-evolve https://pinboard.in/ https://pinboard.in/u:cshalizi/b:e969f493b9fa/ [1906.08806] The Moran forest 2020-12-16T17:37:58+00:00 https://arxiv.org/abs/1906.08806 cshalizi to:NB graph_theory stochastic_processes https://pinboard.in/ https://pinboard.in/u:cshalizi/b:cab6bb488bfe/ [2012.05129] Approximate Network Symmetry 2020-12-10T04:08:14+00:00 https://arxiv.org/abs/2012.05129 cshalizi to:NB graph_theory network_data_analysis https://pinboard.in/ https://pinboard.in/u:cshalizi/b:2972e4b50a6b/ [1910.09483] Sampling random graph homomorphisms and applications to network data analysis 2019-10-22T13:21:40+00:00 https://arxiv.org/abs/1910.09483 cshalizi to:NB network_data_analysis network_sampling graph_theory computational_statistics statistics https://pinboard.in/ https://pinboard.in/u:cshalizi/b:4d49558be133/ [1908.08572] From Community to Role-based Graph Embeddings 2019-08-27T15:43:41+00:00 https://arxiv.org/abs/1908.08572 cshalizi to:NB graph_theory community_discovery network_data_analysis https://pinboard.in/ https://pinboard.in/u:cshalizi/b:f83ae343f882/ [1902.03002] Covariance and Correlation Kernels on a Graph in the Generalized Bag-of-Paths Formalism 2019-08-20T14:26:32+00:00 https://arxiv.org/abs/1902.03002 cshalizi to:NB network_data_analysis to_teach:baby-nets probability graph_theory https://pinboard.in/ https://pinboard.in/u:cshalizi/b:e80f55bccc6c/ [1908.06057] Generalized group-based epidemic model for spreading processes on networks: GgroupEM 2019-08-19T13:20:28+00:00 https://arxiv.org/abs/1908.06057 cshalizi epidemics_on_networks epidemic_models macro_from_micro graph_theory in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:aeab934e4e4d/ Inequalities for Graph Eigenvalues by Zoran Stanić 2019-01-06T01:37:06+00:00 https://www.cambridge.org/core/books/inequalities-for-graph-eigenvalues/0047197D65BB927AAC906784CC7F3774#fndtn-information cshalizi to:NB books:noted downloaded spectral_methods graph_theory mathematics https://pinboard.in/ https://pinboard.in/u:cshalizi/b:b9f193a4e2f6/ [1705.02801] Graph Embedding Techniques, Applications, and Performance: A Survey 2018-08-14T15:55:59+00:00 https://arxiv.org/abs/1705.02801 cshalizi graph_theory network_data_analysis visual_display_of_quantitative_information geometry re:hyperbolic_networks via:rvenkat in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:9c85a77742f4/ Mathematics of Big Data | The MIT Press 2018-07-13T13:03:19+00:00 https://mitpress.mit.edu/books/mathematics-big-data cshalizi to:NB books:noted mathematics computation graph_theory color_me_skeptical https://pinboard.in/ https://pinboard.in/u:cshalizi/b:c0c3270cc170/ Eigenvalues multiplicities and graphs | Discrete mathematics, information theory and coding | Cambridge University Press 2018-02-02T16:51:33+00:00 http://www.cambridge.org/us/academic/subjects/mathematics/discrete-mathematics-information-theory-and-coding/eigenvalues-multiplicities-and-graphs?format=HB&WT.mc_id=Cambridge%2BTracts%2Bin%2BMathematics%2BCluster#OFbA1DJep21QxzhX.97 cshalizi to:NB books:noted graph_theory mathematics markov_models https://pinboard.in/ https://pinboard.in/u:cshalizi/b:f0123af7ce4f/ [1311.6425] Robust Multimodal Graph Matching: Sparse Coding Meets Graph Matching 2016-12-01T20:28:23+00:00 https://arxiv.org/abs/1311.6425 cshalizi to:NB to_read network_comparison graph_theory network_data_analysis statistics information_theory re:network_differences https://pinboard.in/ https://pinboard.in/u:cshalizi/b:596102d3a2b4/ Handbook of Graph Drawing and Visualization 2016-05-07T18:12:38+00:00 https://cs.brown.edu/~rt/gdhandbook/ cshalizi in_NB books:noted graph_theory network_visualization to_teach:baby-nets https://pinboard.in/ https://pinboard.in/u:cshalizi/b:e8a6cd8b5896/ Random Graphs, Geometry and Asymptotic Structure | Cambridge University Press 2016-03-28T03:02:33+00:00 http://www.cambridge.org/us/academic/subjects/mathematics/discrete-mathematics-information-theory-and-coding/random-graphs-geometry-and-asymptotic-structure?format=HB&isbn=9781107136571 cshalizi to:NB books:noted graph_theory stochastic_processes mathematics https://pinboard.in/ https://pinboard.in/u:cshalizi/b:df0329333b9b/ The geometry of graphs and some of its algorithmic applications (Linial, London and Rabinovich, 1995) 2015-07-14T04:02:31+00:00 http://link.springer.com/article/10.1007/BF01200757 cshalizi in_NB graph_theory dimension_reduction mathematics random_projections clustering have_read https://pinboard.in/ https://pinboard.in/u:cshalizi/b:bfbac4c36470/ [1506.00669] Concentration and regularization of random graphs 2015-06-03T15:14:14+00:00 http://arxiv.org/abs/1506.00669 cshalizi to_read concentration_of_measure graph_theory graph_limits re:smoothing_adjacency_matrices re:network_differences in_NB via:mraginsky https://pinboard.in/ https://pinboard.in/u:cshalizi/b:c32f3b03c787/ On convex relaxation of graph isomorphism 2015-03-12T01:10:15+00:00 http://www.pnas.org/content/112/10/2942.abstract.html cshalizi graph_theory computational_complexity optimization convexity network_data_analysis re:network_differences in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:ba1653300c14/ Benjamin, A. and Chartrand, G., Zhang, P.: The Fascinating World of Graph Theory (eBook and Hardcover). 2015-02-06T00:35:16+00:00 http://press.princeton.edu/titles/10314.html cshalizi books:noted mathematics graph_theory in_NB downloaded https://pinboard.in/ https://pinboard.in/u:cshalizi/b:5f7e6e967b72/ [1405.3133] Graph Matching: Relax at Your Own Risk 2015-01-20T04:12:02+00:00 http://arxiv.org/abs/1405.3133 cshalizi graph_theory network_data_analysis optimization re:network_differences in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:2937fbd143b8/ [1411.1546] Tree decompositions and social graphs 2015-01-20T04:01:52+00:00 http://arxiv.org/abs/1411.1546 cshalizi network_data_analysis community_discovery statistics graph_theory social_networks in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:36009ab50a6f/ Max-Plus Objects to Study the Complexity of Graphs - Springer 2014-08-06T11:13:21+00:00 http://link.springer.com/article/10.1007/s11009-012-9311-x cshalizi to:NB graph_theory complexity_measures network_data_analysis https://pinboard.in/ https://pinboard.in/u:cshalizi/b:1ddf520584aa/ [1407.0224] Concentric Symmetry 2014-07-12T01:19:09+00:00 http://arxiv.org/abs/1407.0224 cshalizi to:NB graph_theory network_data_analysis https://pinboard.in/ https://pinboard.in/u:cshalizi/b:9ea97a345981/ [1405.1440] Equitable random graphs 2014-06-07T19:40:03+00:00 http://arxiv.org/abs/1405.1440 cshalizi to:NB network_data_analysis graph_theory kith_and_kin newman.mark to_read https://pinboard.in/ https://pinboard.in/u:cshalizi/b:410175b86f72/ Message-Passing Algorithms for Sparse Network Alignment 2014-04-03T18:43:47+00:00 http://dl.acm.org/citation.cfm?doid=2435209.2435212 cshalizi to_read network_data_analysis graph_theory network_alignment re:network_differences entableted in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:599da396fcdc/ [1403.3448] Coloring Large Complex Networks 2014-03-21T17:43:43+00:00 http://arxiv.org/abs/1403.3448 cshalizi to:NB network_data_analysis graph_theory https://pinboard.in/ https://pinboard.in/u:cshalizi/b:c460e4f527da/ [1403.0598] The Structurally Smoothed Graphlet Kernel 2014-03-10T18:00:40+00:00 http://arxiv.org/abs/1403.0598 cshalizi to:NB kernel_methods network_data_analysis graph_theory to_read re:smoothing_adjacency_matrices re:network_differences https://pinboard.in/ https://pinboard.in/u:cshalizi/b:cf5ca26f08a9/ [1312.1970] An Algorithmic Theory of Dependent Regularizers, Part 1: Submodular Structure 2013-12-28T21:24:42+00:00 http://arxiv.org/abs/1312.1970 cshalizi to:NB optimization graph_theory lasso https://pinboard.in/ https://pinboard.in/u:cshalizi/b:3e10f3856769/ [1312.5179] The Total Variation on Hypergraphs - Learning on Hypergraphs Revisited 2013-12-23T22:00:44+00:00 http://arxiv.org/abs/1312.5179 cshalizi to:NB smoothing graph_theory hypergraphs optimization https://pinboard.in/ https://pinboard.in/u:cshalizi/b:0d3670268bfd/ [1311.7656] Statistical estimation for optimization problems on graphs 2013-12-16T16:22:22+00:00 http://arxiv.org/abs/1311.7656 cshalizi to:NB graph_theory network_data_analysis optimization statistics sra.suvrit https://pinboard.in/ https://pinboard.in/u:cshalizi/b:6daa880f40eb/ [1307.7729] Spectral methods for network community detection and graph partitioning 2013-07-31T13:59:23+00:00 http://arxiv.org/abs/1307.7729 cshalizi heard_the_talk graph_theory community_discovery network_data_analysis spectral_clustering spectral_methods kith_and_kin newman.mark in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:dcb391992efc/ Lecture Notes ``Random Graphs and Complex Networks'' 2013-07-21T03:01:00+00:00 http://www.win.tue.nl/~rhofstad/NotesRGCN.html cshalizito:NB books:noted graph_theory networks stochastic_processes network_data_analysis via:arinaldo https://pinboard.in/ https://pinboard.in/u:cshalizi/b:aab0f559a714/ [1307.2302] The blessing of transitivity in sparse and stochastic networks 2013-07-10T21:34:29+00:00 http://arxiv.org/abs/1307.2302 cshalizi graph_theory network_data_analysis community_discovery rohe.karl heard_the_talk in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:aae6fc52830c/ [1306.3524] Analysis of data in the form of graphs 2013-06-18T15:41:58+00:00 http://arxiv.org/abs/1306.3524 cshalizi data_mining graph_theory graph_limits spectral_methods network_data_analysis re:smoothing_adjacency_matrices re:network_differences in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:2f62f624c7c1/ [1306.3401] Spectral analysis and slow spreading dynamics on complex networks 2013-06-17T22:34:19+00:00 http://arxiv.org/abs/1306.3401 cshalizi graph_spectra graph_theory in_NB epidemics_on_networks https://pinboard.in/ https://pinboard.in/u:cshalizi/b:0360f85ddcfd/ Abstraction and the Organization of Mechanisms 2013-05-17T02:01:52+00:00 http://www.jstor.org/stable/10.1086/670300 cshalizi philosophy_of_science explanation_by_mechanisms graphical_models graph_theory networks abstraction bechtel.william have_read in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:196eada391d9/ [1305.3146] Discriminating Power of Centrality Measures 2013-05-15T15:40:00+00:00 http://arxiv.org/abs/1305.3146 cshalizi to:NB network_data_analysis graph_theory porter.mason_a. https://pinboard.in/ https://pinboard.in/u:cshalizi/b:4200a93d49ba/ [1304.7528] Semi-supervised Eigenvectors for Large-scale Locally-biased Learning 2013-05-01T20:26:53+00:00 http://arxiv.org/abs/1304.7528 cshalizi to:NB smoothing graph_theory spectral_clustering machine_learning https://pinboard.in/ https://pinboard.in/u:cshalizi/b:eb304efb82f8/ [1201.3861] Benjamini-Schramm convergence and the distribution of chromatic roots for sparse graphs 2013-04-23T13:22:52+00:00 http://arxiv.org/abs/1201.3861 cshalizi graph_theory graph_limits re:smoothing_adjacency_matrices via:david.choi in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:df8a798a23dc/ [1304.1548] Subgraph Frequencies: Mapping the Empirical and Extremal Geography of Large Graph Collections 2013-04-08T02:08:55+00:00 http://arxiv.org/abs/1304.1548 cshalizi network_data_analysis graph_theory graph_limits kleinberg.jon in_NB ugander.johan backstrom.lars https://pinboard.in/ https://pinboard.in/u:cshalizi/b:81587f37cc45/ Taylor & Francis Online :: A Sequential Importance Sampling Algorithm for Generating Random Graphs with Prescribed Degrees - Internet Mathematics - Volume 6, Issue 4 2013-04-01T19:54:24+00:00 http://www.tandfonline.com/doi/abs/10.1080/15427951.2010.557277 cshalizi graph_theory graph_sampling blitzstein.joseph diaconis.persi monte_carlo in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:94c28cff2f4a/ [1302.0870] Centrality-constrained graph embedding 2013-03-06T14:49:52+00:00 http://arxiv.org/abs/1302.0870 cshalizi to:NB network_data_analysis graph_theory visual_display_of_quantitative_information re:6dfb re:smoothing_adjacency_matrices https://pinboard.in/ https://pinboard.in/u:cshalizi/b:722674bfa1b9/ Large Networks and Graph Limits 2013-03-05T22:34:42+00:00 http://www.ams.org/bookstore-getitem/item=COLL-60 cshalizi graph_theory graph_limits lovasz.laszlo re:smoothing_adjacency_matrices re:network_differences books:recommended have_read books:owned in_NB via:arinaldo https://pinboard.in/ https://pinboard.in/u:cshalizi/b:abc06ba2e83d/ HAL :: [inria-00630774, version 1] Metric graph reconstruction from noisy data 2013-02-28T20:09:26+00:00 http://hal.archives-ouvertes.fr/inria-00630774/ cshalizi manifold_learning machine_learning statistics graph_theory in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:478661eac5ef/ [1302.4615] Convergent sequences of sparse graphs: A large deviations approach 2013-02-21T15:06:15+00:00 http://arxiv.org/abs/1302.4615 cshalizi graph_limits graph_theory stochastic_processes large_deviations re:smoothing_adjacency_matrices re:network_differences chayes.jennifer borgs.christian re:almost_none in_NB have_read https://pinboard.in/ https://pinboard.in/u:cshalizi/b:d35479322ce9/ Graph Spectra for Complex Networks - Academic and Professional Books - Cambridge University Press 2013-02-17T22:40:06+00:00 http://www.cambridge.org/us/knowledge/isbn/item6958599/?site_locale=en_US cshalizi books:noted spectral_clustering spectral_methods graph_theory network_data_analysis networks in_NB have_skimmed https://pinboard.in/ https://pinboard.in/u:cshalizi/b:18254ea690af/ Phys. Rev. E 87, 012803 (2013): Spectra of random graphs with arbitrary expected degrees 2013-01-10T21:22:50+00:00 http://pre.aps.org/abstract/PRE/v87/i1/e012803 cshalizi spectral_clustering graph_theory community_discovery newman.mark kith_and_kin in_NB https://pinboard.in/ https://pinboard.in/u:cshalizi/b:0db555291a9c/