Euler diagram for P, NP, NP-complete, and NP-hard set of problems (excluding the empty language and its complement, which belong to P but are not NP-complete)
Charles Babbage, sometimes referred to as the "father of computing".
The graph shows the running time vs. problem size for a knapsack problem of a state-of-the-art, specialized algorithm. The quadratic fit suggests that the algorithmic complexity of the problem is O((log(n))2).
Ada Lovelace published the first algorithm intended for processing on a computer.
Diagram of complexity classes provided that P ≠ NP. The existence of problems within NP but outside both P and NP-complete, under that assumption, was established by Ladner's theorem.

The P versus NP problem is a major unsolved problem in theoretical computer science.

- P versus NP problem

This article is a list of notable unsolved problems in computer science.

- List of unsolved problems in computer science

P versus NP problem

- List of unsolved problems in computer science

The problem has been called the most important open problem in computer science.

- P versus NP problem

The famous P = NP? problem, one of the Millennium Prize Problems, is an open problem in the theory of computation.

- Computer science

What is the lower bound on the complexity of fast Fourier transform algorithms? is one of unsolved problems in theoretical computer science.

- Computer science
Euler diagram for P, NP, NP-complete, and NP-hard set of problems (excluding the empty language and its complement, which belong to P but are not NP-complete)

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