An urge to gamble continuously despite negative consequences or a desire to stop.

(computing) In multithreaded computing, when a program mistakenly considers equality of a variable at two times to mean it has never changed in between.

The need to make a decision between alternatives that are both desirable.

The situation where a spam filter or search engine blocks or modifies content because the text contains a string of letters shared with an obscene word.

plural of problem child

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

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.

(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.

Compulsive, excessive consumption of alcohol.

To solve a problem in a way that creates another problem, often of equal nature and severity.