A branch of mathematics that studies the properties of topological spaces endowed with ℝᵏ-valued functions, with respect to the change of these functions.

(mathematics) A branch of functional analysis, being the study of linear operators on function spaces.

(political science) The theory that the far left and the far right, rather than being at opposite ends of a political continuum, in fact closely resemble one another.

A theory that explains the aggregation of aqueous dispersions quantitatively and describes the force between charged surfaces interacting through a liquid medium.

A mathematical technique for finding an approximate solution to a problem that cannot be solved exactly, by starting from the exact solution of a related problem; used in modelling physical interactions between particles, etc.

(physics) A mathematical approach to developing a theory of everything in theoretical physics, based on quantizing spacetime into units called metrons.

(physics) The theory that (most) baryons and mesons are composed of bound quarks and antiquarks.

(uncountable, algebra, algebraic geometry, algebraic topology) The study of rings R generated by the set of vector bundles over some topological space or scheme;

(quantum mechanics) The study of the analytic properties of scattering as a function of angular momentum, where the angular momentum is not restricted to an integer but may take any complex value.

Sigmund Freud's hypothesis, in the mid-1890s, that a repressed memory of an early childhood sexual abuse experience was the essential precondition for hysterical or obsessional symptoms.