functional
mapping from a mathematical space to the real or complex numbers
norm
length in a vector space
blossom
functional for polynomials
distribution
a continuous functional on a space of test functions (Schwartz space), which generalizes the concept of locally integrable functions
modulus of continuity
function gauging the uniform continuity of a function
linear functional
linear mapping from a vector space into its field of scalars
entanglement witness
in quantum information theory, a functional which distinguishes a specific entangled state from separable ones