Turing machine
A Turing machine is a mathematical model of a general computing machine. It is a theoretical device that manipulates symbols contained on a s… 展开

Defining complexity classes
A complexity classis a set of problems of related complexity. Simpler complexity classes are defined by the following factors: 1. The type of co… 展开

P versus NP problem
The complexity class P is often seen as a mathematical abstraction modeling those computational tasks that admit an efficient algorithm. This h… 展开

A problem that can be solved in theory (e.g. given large but finite resources, especially time), but for which in practice any solution takes too many resources to be useful, is known as an intr… 展开