(mathematics) One of the earlier theorems leading to Roth's theorem (a Diophantine approximation to algebraic numbers), establishing an exponent d/2+1+ε.

A person occupied with surveying -- the process of determining positions on the earth's surface.

Of, facing, situated in, or related to the north-west / (of a wind) blowing from the north-west; north-westerly

Synonym of triangulation pillar