A polygonal number is a type of figurate number that is a generalization of triangular, square, etc., to an-gon for an arbitrary positive integer. The above diagrams graphically illustrate the process by which the polygonal numbers are built up. Starting with the th triangular number, then.
PURPOSE: Divergence insufficiency is an unusual form of strabismus with esotropia and diplopia only at distance and single binocular vision at near.This retrospective case series describes the diagnosis and treatment of 7 patients and differentiates this clinical entity from other conditions.ONCLUSIONS: Divergence insufficiency is a distinct clinical entity in otherwise healthy patients, which can be successfully treated by unilateral or bilateral medial rectus recession. [PubMed-indexed for MEDLINE].
The divergence of a vector field , denoted or (the notation used in this work), is defined by a limit of the surface integral. (1) where the surface integral gives the value of integrated over a closed infinitesimal boundary surface surrounding a volume element , which is taken to size zero using a limiting process. The divergence of a vector field is therefore a scalar field. If , then the field is said to be a divergenceless field.