plural of wicked problem

(social planning) A problem that is difficult or impossible to solve because of incomplete, contradictory, and changing requirements that are often difficult to recognize.

(idiomatic) A problem expected with any new and untried product, system, or venture

(mathematics) A mathematical problem, asking whether a room with mirrored walls can always be illuminated by a single-point light source, allowing for repeated reflection of light off the mirrored walls. It was solved in 1958: there are such rooms that cannot be thus illuminated.

(quantum mechanics) The unresolved problem of what causes a wavefunction to collapse into an eigenstate, or whether wavefunctions collapse at all.

Alternative spelling of subproblem

plural of sub-problem

plural of champagne problem

(statistics) The difficulty in drawing inferences from cross-cultural data, due to the statistical phenomenon of autocorrelation.

A concise description of a problem