https://academa.ai/ https://academa.ai/lectures https://academa.ai/lectures/bloom-filters 2026-08-30T17:01:20.638Z https://academa.ai/media/l/01M19SK3W4QJFB6TX2A5JPYD30/0/dark/poster.jpg The Bloom Filter How a Bloom filter tests membership in a few bits per item, why false positives happen, how to pick k, and why deletion is forbidden. https://academa.ai/media/l/01M19SK3W4QJFB6TX2A5JPYD30/0/dark/master.m3u8 854 2026-08-30T17:01:20.638Z no no Computer Science https://academa.ai/lectures/clustering-k-means-and-where-it-fails 2026-08-30T17:21:39.514Z https://academa.ai/media/l/01M19SM5WHYPTTMJGRFR6PX1HW/0/dark/poster.jpg K-Means, Its Failure Modes, and Gaussian Mixture Models A practical visual guide to k-means iteration, its key failure modes, soft membership, and Gaussian mixtures with learned covariance. https://academa.ai/media/l/01M19SM5WHYPTTMJGRFR6PX1HW/0/dark/master.m3u8 822 2026-08-30T17:21:39.514Z no no Machine Learning https://academa.ai/lectures/comparative-advantage-gains-from-trade 2026-08-30T17:01:49.311Z https://academa.ai/media/l/01M19SKDV2XQ3YJ11N72FXZ50C/0/dark/poster.jpg Comparative Advantage: Why Both Countries Gain from Trade Why two countries both gain from trade even when one is slower at everything: opportunity cost, specialization and the frontier. https://academa.ai/media/l/01M19SKDV2XQ3YJ11N72FXZ50C/0/dark/master.m3u8 961 2026-08-30T17:01:49.311Z no no Economics https://academa.ai/lectures/decision-trees-and-why-forests-beat-them 2026-08-30T17:19:25.698Z https://academa.ai/media/l/01M19SM6VREA3SRBZH54JYAS21/0/dark/poster.jpg From One Decision Tree to a Random Forest Grow, overfit, and prune one decision tree, then build a random forest and see why averaging decorrelated trees reduces prediction variance. https://academa.ai/media/l/01M19SM6VREA3SRBZH54JYAS21/0/dark/master.m3u8 1199 2026-08-30T17:19:25.698Z no no Machine Learning https://academa.ai/lectures/dimensional-analysis-drag 2026-08-30T17:16:09.773Z https://academa.ai/media/l/01M19SKSKEJ949AVPHCC2S9S8R/0/dark/poster.jpg Why Wind Tunnel Models Work: Dimensional Analysis of Aerodynamic Drag Why a scale model predicts the drag on a real aircraft: count the dimensions, derive Reynolds and the drag coefficient, and see where Mach breaks similarity. https://academa.ai/media/l/01M19SKSKEJ949AVPHCC2S9S8R/0/dark/master.m3u8 1006 2026-08-30T17:16:09.773Z no no Engineering https://academa.ai/lectures/edit-distance-dp-derivation 2026-08-30T17:13:06.506Z https://academa.ai/media/l/01M19SK718NZ7C2RPEYKP7ACXD/0/dark/poster.jpg Edit Distance: From Memorization to Derivation Derive the edit distance recurrence, fill its table cell by cell, recover the edits, and count the work plain recursion repeats. https://academa.ai/media/l/01M19SK718NZ7C2RPEYKP7ACXD/0/dark/master.m3u8 968 2026-08-30T17:13:06.506Z no no Computer Science https://academa.ai/lectures/entropy-as-twenty-questions 2026-08-30T17:02:48.861Z https://academa.ai/media/l/01M19SK8DRS8REXV7NH21A3VPT/0/dark/poster.jpg From Twenty Questions to Entropy and Huffman Compression Derive entropy from twenty questions, build a Huffman code, compare its length with the limit, and explain when files can compress. https://academa.ai/media/l/01M19SK8DRS8REXV7NH21A3VPT/0/dark/master.m3u8 871 2026-08-30T17:02:48.861Z no no Computer Science https://academa.ai/lectures/halting-problem-undecidability 2026-08-30T17:07:37.537Z https://academa.ai/media/l/01M19SK9AYK19NKG9DMMFYTY90/0/dark/poster.jpg The Halting Problem Is Undecidable Cantor's diagonal, the table of programs against inputs, and the contrary program that proves no halting decider can exist. https://academa.ai/media/l/01M19SK9AYK19NKG9DMMFYTY90/0/dark/master.m3u8 966 2026-08-30T17:07:37.537Z no no Computer Science https://academa.ai/lectures/maxflow-mincut-theorem 2026-08-30T17:07:33.434Z https://academa.ai/media/l/01M19SKABXWRQJ3FKQRVH35EQB/0/dark/poster.jpg Maximum Flow Equals Minimum Cut: Proof by Example Max flow equals min cut, worked by hand on one small network: augmenting paths, a residual backward edge, and the cut that certifies the answer. https://academa.ai/media/l/01M19SKABXWRQJ3FKQRVH35EQB/0/dark/master.m3u8 1123 2026-08-30T17:07:33.434Z no no Computer Science https://academa.ai/lectures/monopoly-marginal-revenue-and-price-discrimination 2026-08-30T17:13:18.503Z https://academa.ai/media/l/01M19SKFN0RYCV99HZMTT8CBJP/0/dark/poster.jpg Monopoly, Marginal Revenue, and Price Discrimination Derive monopoly marginal revenue, compare monopoly with competition, and trace welfare under group and perfect price discrimination. https://academa.ai/media/l/01M19SKFN0RYCV99HZMTT8CBJP/0/dark/master.m3u8 922 2026-08-30T17:13:18.503Z no no Economics https://academa.ai/lectures/pagerank-the-random-surfer 2026-08-30T17:25:45.535Z https://academa.ai/media/l/01M19SKB7NSKN92WWB1RWSY40D/0/dark/poster.jpg How Hyperlinks Become Votes: The PageRank Algorithm Build PageRank from a random surfer on six pages: link matrix, power iteration, damping factor, dangling pages and rank sinks. https://academa.ai/media/l/01M19SKB7NSKN92WWB1RWSY40D/0/dark/master.m3u8 698 2026-08-30T17:25:45.535Z no no Computer Science https://academa.ai/lectures/planar-truss-method-of-joints 2026-08-30T17:23:58.117Z https://academa.ai/media/l/01M19SM2C33Y3Y89W08TVXEVCE/0/dark/poster.jpg Planar Truss Analysis: Method of Joints Analyse one planar truss by the method of joints: support reactions, joint equilibrium, tension and compression signs, zero force members. https://academa.ai/media/l/01M19SM2C33Y3Y89W08TVXEVCE/0/dark/master.m3u8 920 2026-08-30T17:23:58.117Z no no Engineering https://academa.ai/lectures/regex-to-automata 2026-08-30T17:01:50.041Z https://academa.ai/media/l/01M19SKC7FQ64TJ1N101W18856/0/dark/poster.jpg Automata Behind Regular Expressions Build the state machine behind a regular expression, run a string through it, determinise it, and meet the two things regexes cannot do. https://academa.ai/media/l/01M19SKC7FQ64TJ1N101W18856/0/dark/master.m3u8 1044 2026-08-30T17:01:50.041Z no no Computer Science https://academa.ai/lectures/the-market-for-lemons-how-hidden-quality-can-cause-a-market-collapse 2026-08-30T17:25:08.479Z https://academa.ai/media/l/01M19SKMZAETYCGSXHFW1S8YCA/0/dark/poster.jpg The Market for Lemons: How Hidden Quality Can Make Good Products Disappear A used-car example explains adverse selection, market unraveling, the value of visible quality, and what common repairs actually fix. https://academa.ai/media/l/01M19SKMZAETYCGSXHFW1S8YCA/0/dark/master.m3u8 759 2026-08-30T17:25:08.479Z no no Economics https://academa.ai/lectures/three-sat-vertex-cover-reduction 2026-08-30T17:09:36.822Z https://academa.ai/media/l/01M19SKCWSVAPG524XAQPNBSWY/0/dark/poster.jpg NP-Completeness and Reduction: From Definitions to the 3-SAT to Vertex Cover Proof P and NP defined by verifiers, then the 3-SAT to Vertex Cover reduction built and argued in both directions on one formula. https://academa.ai/media/l/01M19SKCWSVAPG524XAQPNBSWY/0/dark/master.m3u8 1265 2026-08-30T17:09:36.822Z no no Computer Science https://academa.ai/lectures/torsion-shafts 2026-08-30T17:30:22.537Z https://academa.ai/media/l/01M19SM35EGT0TGJ4CHH8GHCK1/0/dark/poster.jpg Torsion: From Geometry to Shaft Design How twisting a round shaft gives shear strain linear in radius, the torque integral, the polar moment of area, and why drive shafts are tubes. https://academa.ai/media/l/01M19SM35EGT0TGJ4CHH8GHCK1/0/dark/master.m3u8 764 2026-08-30T17:30:22.537Z no no Engineering https://academa.ai/lectures/who-really-pays-a-tax 2026-08-30T17:20:11.791Z https://academa.ai/media/l/01M19SKNPZBTDRABZAG9RJ3MMF/0/dark/poster.jpg Who Really Bears a Tax? Tax Incidence, Elasticity, and Deadweight Loss See how elasticities split a per-unit tax, why remittance rules do not decide incidence, and why deadweight loss rises with tax squared. https://academa.ai/media/l/01M19SKNPZBTDRABZAG9RJ3MMF/0/dark/master.m3u8 829 2026-08-30T17:20:11.791Z no no Economics https://academa.ai/pricing https://academa.ai/privacy https://academa.ai/subjects/computer-science https://academa.ai/subjects/economics https://academa.ai/subjects/engineering https://academa.ai/subjects/machine-learning https://academa.ai/team https://academa.ai/terms