semiorthogonal

Adjective

 * 1)  Having the property that every subcategory is in the set of orthogonal subcategories of every higher order subcategory.
 * 2)  Either columnwise orthogonal (having the property that M'M is an identity matrix) or rowwise orthogonal (having the property that MM' is an identity matrix).
 * 3)  Orthogonal to the corresponding approximation space.
 * 1)  Orthogonal to the corresponding approximation space.