Corresponding to retarded and advanced times are retarded and advanced potentials.
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Harvard believes stem cell research is essential in advancing potential treatments for serious human ills.
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:Advanced potential may be relevant.
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As with any wave equation, these equations lead to two types of solution : advanced potentials ( which are related to the configuration of the sources at future points in time ), and retarded potentials ( which are related to the past configurations of the sources ); the former are usually disregarded where the field is to analyzed from a causality perspective.