Known problem which is assumed to have an objective and verifiable solution, but which has not yet been solved.
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The localization of persons in indoor environments is nowadays an open problem.
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However, the mechanistic origin of resting state is obscured by large-scale models' complexity, and a close structure-function relation is still an open problem.
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This question was one of the outstanding open problems of his day.
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He seems more concerned with precise measurements than with questionings as to the open problems of his science.
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Yet he had always thought that he possessed a strong paternal instinct, an interest in young life, in opening problems.
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But a breakthrough from scientists at Berkeley Lab could be the solution the planet needs for this eye- opening problem -recyclable plastics.
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