one hundred interactive studies in logic, sets, proof, counting, graphs, number, and chance
Most of mathematics flows; this part counts. Discrete mathematics is the study of things that come in separate, whole pieces — statements that are true or false, sets you can list, paths you can trace, choices you can tally. It is the mathematics beneath every computer, every code, every argument. Open a chapter below, then open its studies one at a time. Every instrument on this page is live: drag it, press it, break it, and see what happens.