ABSTRACT
Abbe’s sine condition (Ernst Abbe 18401905) n′l′ sin β ′ = nl sin β where n, n′, β, β ′ are the refraction indices and refraction angles, respectively.
Abelian group (Niels Henrik Abel 18021829 ) A group (G, ·) is called Abelian or commutative if a · b = b · a for all a, b ∈ G. Abelian theorems (1) Suppose ∑∞n=0 anxn converges for |x| < R and for x = R. Then the series converges uniformly on 0 ≤ x ≤ R.
