These funds go by several names such as age-based allocation models, age-based funds or target-date funds, but they all are designed to assist the investor by investing in funds based on their age when they plan to retire. Age-Based Funds Vs. Lifestyle Funds. Age-based funds are normally set up as mutual funds.
radial symmetry. n. 1. (Biology) a type of structure of an organism or part of an organism in which a vertical cut through the axis in any of two or more planes produces two halves that are mirror images of each other. Compare bilateral symmetry.oun. 1. radial symmetry-the property of symmetry about an axis; the starfish illustrates radial symmetry. symmetricalness, symmetry, correspondence, balance - (mathematics) an attribute of a shape or relation; exact reflection of form on opposite sides of a dividing line or plane.
Formally the rotational symmetry is symmetry with respect to some or all rotations in m-dimensional Euclidean space. Rotations are direct isometries, i.e., isometries preserving orientation. Therefore a symmetry group of rotational symmetry is a subgroup of E + (m) (see Euclidean group). Symmetry with respect to all rotations about all points implies translational symmetry with respect to all translations, so space is homogeneous, and the symmetry group is the whole E (m).