A kind of puzzle in which there is one common factor in a first set of diagrams that is missing from a second set. The solver (possibly a computer program) must identify this factor.

A communication problem where a person seeking help (for example, from a computing helpdesk) provides misleadingly incomplete information about the source of the problem and thus receives inaccurate or unhelpful suggestions about how to fix it.

The problem that the meanings of symbols cannot be grounded, but require more symbols to explain them.

plural of problem play

(theater) A form of drama that emerged in the 19th century as part of realism, dealing with contentious social issues through debates between the characters on stage, who typically represent conflicting points of view within a realistic social context.

(mathematics) The challenge of proving that the only solution of the Diophantine equation :∑ₙ₌₁ᴺn²=M²; with N > 1 is when N = 24 and M = 70.

(computing theory) A question in some formal system with a yes-or-no answer, depending on the values of input parameters.

(cellular automata) The problem of finding one-dimensional cellular automaton rules that accurately perform majority voting.

(philosophy) The difficulty of using statistical probability to evaluate the plausibility of a statement such as "the sun will rise tomorrow" based only on prior observations.

Synonym of Newcomb's paradox