apexpunt

Apexpunt is a term used in computational geometry and optimization to describe a distinguished point in a high-dimensional parameter space. It characterizes a convergence or compromise position where several objective criteria are simultaneously favorable, and it is often used to guide adaptive sampling, mesh refinement, or multi-criteria decision making.

Formally, in a problem with multiple objectives, an apexpunt is typically a point where the gradients of the objectives align with a common subspace, resulting in minimal net change along those directions. The local curvature around an apexpunt generally indicates a peak or high value along several independent directions. In practice, it serves as a practical anchor rather than a single, globally optimal solution.

Etymology for the term blends apex, meaning the top or peak, with punt, indicating a junction or pivot point. The coinage emerged within computational science communities in the early 21st century and has been popularized through technical discussions and literature describing multi-criteria optimization.

Properties of apexpunt points include that they are not guaranteed to exist for every problem, can occur in multiples or as a continuum, and may be sensitive to the scaling and weighting of objectives. They are typically approximate and context-dependent, chosen to suit the needs of a given algorithm or application.

Applications of the apexpunt concept appear in areas such as stabilizing iterative schemes by providing a reference target, selecting representative samples in adaptive meshing, and guiding the choice of compromise solutions in multi-objective optimization.

See also: apex, punt, gradient, Hessian, Pareto frontier, multi-objective optimization.