EntityQ7511782· pop 5· linked from 6 articlessieveSign in to saveconcept used in defining a Grothendieck topology; generalization of the collection of open subsets of an open setConnectionsmathematicsEntityInternational Standard Book NumberEntitytopologyEntitydigital object identifierEntitysubsetEntityAlexander GrothendieckEntitycategory theoryEntityCambridge University PressEntityopen setEntityidealEntityring theoryEntitycategoryEntitycodomainEntitySpringer Science+Business MediaEntityorder theoryEntityMichael ArtinEntitycoverEntitymorphismEntityMathematical ReviewsEntityfilterEntityCategoriesCategory theory