Representation
Data structure changes the available moves.
Arrays, graphs, trees, streams, machine words, and symbolic expressions expose different operations and hide different costs.
Representation · procedure · execution · system · communication
Computer Science
Computer science studies computation across layers: physical machines, software, algorithms, intelligent systems, mathematical limits, and secure communication. Start with the layer that matches the question you want to ask.
Primary navigation · computing stack
Follow computation from physical state to abstract behavior.
These six routes are the direct children of Computer Science. The stack is compact enough to preserve the runtime world around it, but every destination remains unmistakably navigational.
Field principles · reference, not navigation
Abstraction hides detail so another question can become tractable.
A function can ignore transistor timing, an algorithm can ignore syntax, and computation theory can ignore the processor brand. Hidden layers still matter, but not every layer must be solved at once.
Execution
A description becomes computation through state change.
Instructions, runtimes, processors, memory, and networks cooperate to turn formal procedures into actual behavior.
Composition
Large systems depend on contracts between layers.
Interfaces let components cooperate without requiring every layer to understand every implementation detail beneath it.