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Brisk screencasts on the lambda calculus, Turing machines, the halting problem, the Chomsky hierarchy, and other topics using code, not mathematical notation. See the introduction.

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Ninety screencasts covering advanced Unix shell use, design, advanced testing practices, and others. Unusually concrete without abstract hand-waving. Try one for free.


The Programmer's Compendium is a reference for often-misunderstood programming concepts, aiming for neutrality and directness. Try the free article on Types.