Egtry Books

Learn programming through code execution visualization.

Featured pages

A tour across the tracks — open any card to read it.

Machine Learning Backpropagation, Exactly Turn the chain rule into arithmetic: watch gradients flow backward through a tiny network, one exact number at a time. Open page →
Physics Quantum States & Qubits From classical bits to superposition: build qubit states, measure them, and see the probabilities fall out. Open page →
Biology Genome Assembly with de Bruijn Graphs Reassemble a genome from short reads by walking a de Bruijn graph edge by edge. Open page →
Optimization Max-Flow, Min-Cut Push flow through a network until it saturates — and see why the smallest cut caps the largest flow. Open page →
Networks & Encryption RSA with Keys You Can Check Generate real RSA keys with numbers small enough to verify by hand, then encrypt and decrypt step by step. Open page →
Databases Query Plans Watch the planner turn SQL into an operator tree — nested-loop vs hash joins, cardinalities, and cost. Open page →
Finance Binomial Option Pricing Price an option by building the binomial tree and rolling values back through it, node by node. Open page →
Mathematics Linear Algebra Vectors, matrices, and transformations made concrete — every product and pivot computed in the open. Open page →
Applied Math Computer Graphics The math behind the pixels: transform, project, and rasterize a scene one matrix at a time. Open page →
Law Legal Rules as Code Turn a stated legal rule into data: elements, fact inputs, thresholds, and exceptions you can execute. Open page →

Tracks

Programming Languages - 21 books
Data Structures and Algorithms - 21 books
Web - 8 books
Python Data Analysis - 7 books
Mathematics - 9 books
Applied Math - 4 books
Physics - 76 books
Biology - 11 books
Finance - 13 books
Law - 21 books
Databases - 9 books
Operations Research / Optimization - 16 books
Networks & Encryption - 11 books
Machine Learning - 20 books

Books