subordinatesubordinate formsubpathsubpopulationsubprojectsubregionsubregularsubringsubroutinesubsamplingsubscriptsubsectionsubsemigroupsubsequencesubsequentsubsequent lettersubsequentialsubsequential limitsubsequentlysubseriessubsetsubset defined bysubsidiarysubsidiary equationsubsidiary ledgersubsistingsubspacesubspace affinesubspace of a topological spacesubstancesubstantialsubstatementsubstitutesubstitutionsubstitution method of solving equationssubstitution popertysubstitution processsubstratasubstringsubsystemsubtangentsubtendsubtended anglesubterraneansubtitutesubtractsubtractionsubtraction of eventssubtraction signsubtractive