#DecisionProblems
I was lead down that #RabbitHole by:

en.wikipedia.org/wiki/BQP

"
In #ComputationalComplexity theory, #BoundedError #QuantumPolynomialTime ( #BQP) is the class of #DecisionProblems solvable by a #QuantumComputer in #PolynomialTime, with an #ErrorProbability of at most 1/3 for all instances.
BQP - Wikipedia
en.wikipedia.org
August 29, 2026 at 4:27 AM
Unlike #DecisionProblems, the #YesInstances (the inputs for which an #algorithm must return yes) and #NoInstances do not exhaust the set of all inputs. Intuitively, the algorithm has been promised that the input does indeed belong to the set of yes instances or no instances.
August 29, 2026 at 4:25 AM