https://academa.ai/ https://academa.ai/lectures https://academa.ai/lectures/alternating-current-phasors-power-factor 2026-08-28T19:21:59.537Z https://academa.ai/media/l/01M14TY2TTRGKQ79KDQV8VY0ZH/0/dark/poster.jpg Alternating Current: Phasors and Power Factor Phasors, impedance and power factor for AC circuits: why current lags, what reactive power costs, and how a capacitor fixes it. https://academa.ai/media/l/01M14TY2TTRGKQ79KDQV8VY0ZH/0/dark/master.m3u8 1149 2026-08-28T19:21:59.537Z 3 no no Engineering https://academa.ai/lectures/backpropagation-is-the-chain-rule-on-a-graph 2026-08-28T19:43:01.707Z https://academa.ai/media/l/01M14TYHEZ773ZHEW56KCCSAHJ/0/dark/poster.jpg Backpropagation by Hand: From Computational Graphs to Matrix Gradients Follow a tiny neural network through exact forward values, scalar chain-rule backpropagation, matrix gradients, and activation-memory costs. https://academa.ai/media/l/01M14TYHEZ773ZHEW56KCCSAHJ/0/dark/master.m3u8 1169 2026-08-28T19:43:01.707Z 3 no no Machine Learning https://academa.ai/lectures/bloom-filters 2026-08-28T18:45:02.106Z https://academa.ai/media/l/01M14TX4X2AEBCN974JH81ZCHZ/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/01M14TX4X2AEBCN974JH81ZCHZ/0/dark/master.m3u8 857 2026-08-28T18:45:02.106Z no no Computer Science https://academa.ai/lectures/comparative-advantage-gains-from-trade 2026-08-28T18:49:53.634Z https://academa.ai/media/l/01M14TXQT46WJ0VNFGB1Q942FC/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/01M14TXQT46WJ0VNFGB1Q942FC/0/dark/master.m3u8 963 2026-08-28T18:49:53.634Z 1 no no Economics https://academa.ai/lectures/cournot-duopoly-and-best-responses 2026-08-28T18:55:21.303Z https://academa.ai/media/l/01M14TXT0PVMXZ1QRS662NNA4E/0/dark/poster.jpg Cournot Competition: Best-Response Dynamics and the Race to Equilibrium Watch Cournot firms chase best responses to equilibrium, then compare its price with monopoly, competition, and Bertrand pricing. https://academa.ai/media/l/01M14TXT0PVMXZ1QRS662NNA4E/0/dark/master.m3u8 1036 2026-08-28T18:55:21.303Z no no Economics https://academa.ai/lectures/deriving-shear-moment-diagrams 2026-08-28T19:09:19.623Z https://academa.ai/media/l/01M14TY448ABTYCPADC1FDHE42/0/dark/poster.jpg Shear and Moment Diagrams from First Principles Cut a beam, take the free body, and derive shear and moment diagrams from equilibrium, then from the two derivatives that govern them. https://academa.ai/media/l/01M14TY448ABTYCPADC1FDHE42/0/dark/master.m3u8 1075 2026-08-28T19:09:19.623Z no no Engineering https://academa.ai/lectures/dimensional-analysis-drag 2026-08-28T19:14:25.785Z https://academa.ai/media/l/01M14TY5WHGF2FPAP90WKFQNRA/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/01M14TY5WHGF2FPAP90WKFQNRA/0/dark/master.m3u8 1020 2026-08-28T19:14:25.785Z 1 no no Engineering https://academa.ai/lectures/edit-distance-dp-derivation 2026-08-28T18:45:47.269Z https://academa.ai/media/l/01M14TXCAC8KKYS97CWXZ1BWNE/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/01M14TXCAC8KKYS97CWXZ1BWNE/0/dark/master.m3u8 943 2026-08-28T18:45:47.269Z no no Computer Science https://academa.ai/lectures/euler-buckling-columns 2026-08-28T19:13:51.665Z https://academa.ai/media/l/01M14TY71B7KJ7N3M9NE8BZATV/0/dark/poster.jpg Euler Buckling: Why Slender Columns Fail by Instability Why slender columns buckle: the critical load derived from the deflected shape, effective length from inflection points, and the slenderness limit. https://academa.ai/media/l/01M14TY71B7KJ7N3M9NE8BZATV/0/dark/master.m3u8 1052 2026-08-28T19:13:51.665Z 2 no no Engineering https://academa.ai/lectures/frequency-response-bode-closed-loop 2026-08-28T19:16:09.089Z https://academa.ai/media/l/01M14TY867AYWPKBBRWT86KP3M/0/dark/poster.jpg Frequency Response: From Poles and Zeros to Stability and Compensation Build Bode magnitude and phase curves from poles and zeros, define gain and phase margin, then see what lag and lead compensators change. https://academa.ai/media/l/01M14TY867AYWPKBBRWT86KP3M/0/dark/master.m3u8 1660 2026-08-28T19:16:09.089Z 2 no no Engineering https://academa.ai/lectures/halting-problem-undecidability 2026-08-28T18:45:36.643Z https://academa.ai/media/l/01M14TXEZX293E70GEK3H8CACX/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/01M14TXEZX293E70GEK3H8CACX/0/dark/master.m3u8 992 2026-08-28T18:45:36.643Z no no Computer Science https://academa.ai/lectures/instantaneous-axis-of-rotation 2026-08-28T19:20:12.654Z https://academa.ai/media/l/01M14TYA5P7YWR2CMWJYKMN214/0/dark/poster.jpg Kinematics of a Body: The Instantaneous Axis The rigid-body velocity relation, the instantaneous centre of a rolling wheel, and the screw axis that replaces it in three dimensions. https://academa.ai/media/l/01M14TYA5P7YWR2CMWJYKMN214/0/dark/master.m3u8 481 2026-08-28T19:20:12.654Z 1 no no Engineering https://academa.ai/lectures/maxflow-mincut-theorem 2026-08-28T18:45:48.185Z https://academa.ai/media/l/01M14TXHCXEMC5NM1W4SXGF7P6/0/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/01M14TXHCXEMC5NM1W4SXGF7P6/0/dark/master.m3u8 1139 2026-08-28T18:45:48.185Z 2 no no Computer Science https://academa.ai/lectures/monopoly-marginal-revenue-and-price-discrimination 2026-08-28T18:54:11.086Z https://academa.ai/media/l/01M14TXV617E4GZ23JQR30YYCA/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/01M14TXV617E4GZ23JQR30YYCA/0/dark/master.m3u8 936 2026-08-28T18:54:11.086Z 1 no no Economics https://academa.ai/lectures/pagerank-the-random-surfer 2026-08-28T18:51:49.805Z https://academa.ai/media/l/01M14TXJEYMJ7SQEJYRCTTSZRP/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/01M14TXJEYMJ7SQEJYRCTTSZRP/0/dark/master.m3u8 681 2026-08-28T18:51:49.805Z 1 no no Computer Science https://academa.ai/lectures/pid-control-one-term-at-a-time 2026-08-28T19:27:07.264Z https://academa.ai/media/l/01M14TYE5YQN06G7H8ST7F6QPD/0/dark/poster.jpg PID Control, One Term at a Time Build a PID controller one term at a time on a cruise control: proportional offset, integral windup, derivative damping, and tuning. https://academa.ai/media/l/01M14TYE5YQN06G7H8ST7F6QPD/0/dark/master.m3u8 1002 2026-08-28T19:27:07.264Z no no Engineering https://academa.ai/lectures/planar-truss-method-of-joints 2026-08-28T19:33:31.701Z https://academa.ai/media/l/01M14TYF4MA5MTVE5SWD76QWSG/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/01M14TYF4MA5MTVE5SWD76QWSG/0/dark/master.m3u8 936 2026-08-28T19:33:31.701Z 4 no no Engineering https://academa.ai/lectures/regex-to-automata 2026-08-28T18:49:39.333Z https://academa.ai/media/l/01M14TXMSYRCBP5CTHVWH3TN01/0/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/01M14TXMSYRCBP5CTHVWH3TN01/0/dark/master.m3u8 1060 2026-08-28T18:49:39.333Z no no Computer Science https://academa.ai/lectures/second-price-auctions-and-honest-bidding 2026-08-28T18:55:54.598Z https://academa.ai/media/l/01M14TXWNP8RS8MQP0KDSRPNQJ/0/dark/poster.jpg Why Truthful Bidding Works—and Why First-Price Bidders Shade See truthful bidding proved by cases, first-price bid shading derived from incentives, and revenue equivalence stated with its assumptions. https://academa.ai/media/l/01M14TXWNP8RS8MQP0KDSRPNQJ/0/dark/master.m3u8 769 2026-08-28T18:55:54.598Z no no Economics https://academa.ai/lectures/solving-2-2-games-best-responses-pure-and-mixed-nash-equilibria 2026-08-28T19:07:13.510Z https://academa.ai/media/l/01M14TXXS3DT7ZDH2RQ7RMREF3/0/dark/poster.jpg Solving 2×2 Games by Hand: Best Responses, Pure Equilibria, and Mixing Solve 2×2 games by hand using payoff matrices, best-response marks, pure Nash equilibria, expected payoffs, and mixed strategies. https://academa.ai/media/l/01M14TXXS3DT7ZDH2RQ7RMREF3/0/dark/master.m3u8 1402 2026-08-28T19:07:13.510Z 1 no no Economics https://academa.ai/lectures/supply-and-demand-actually-moving 2026-08-28T19:00:13.108Z https://academa.ai/media/l/01M14TXYVM991EQBXEF3E9CSZ8/0/dark/poster.jpg Supply and Demand in Motion: Equilibrium, Shifts, and Movements Along Curves Learn supply, demand, and equilibrium, then see how harvests, tastes, and new competitors shift curves and change market outcomes. https://academa.ai/media/l/01M14TXYVM991EQBXEF3E9CSZ8/0/dark/master.m3u8 855 2026-08-28T19:00:13.108Z 1 no no Economics https://academa.ai/lectures/the-market-for-lemons-how-hidden-quality-can-cause-a-market-collapse 2026-08-28T19:02:30.409Z https://academa.ai/media/l/01M14TY00VQ11Q8J1N1K0J94Z1/0/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/01M14TY00VQ11Q8J1N1K0J94Z1/0/dark/master.m3u8 753 2026-08-28T19:02:30.409Z no no Economics https://academa.ai/lectures/three-sat-vertex-cover-reduction 2026-08-28T18:50:14.620Z https://academa.ai/media/l/01M14TXPGH643NHQ5B5ZQFEB15/0/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/01M14TXPGH643NHQ5B5ZQFEB15/0/dark/master.m3u8 1262 2026-08-28T18:50:14.620Z 1 no no Computer Science https://academa.ai/lectures/torsion-shafts 2026-08-28T19:38:08.598Z https://academa.ai/media/l/01M14TYG4BTT9C22N6DCGBTAD6/0/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/01M14TYG4BTT9C22N6DCGBTAD6/0/dark/master.m3u8 777 2026-08-28T19:38:08.598Z 3 no no Engineering https://academa.ai/lectures/who-really-pays-a-tax 2026-08-28T19:08:28.849Z https://academa.ai/media/l/01M14TY1BMNC4JY71B5DAKBZMS/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/01M14TY1BMNC4JY71B5DAKBZMS/0/dark/master.m3u8 814 2026-08-28T19:08:28.849Z 3 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