Consequently, only a discrete set of frequencies of light may be absorbed or emitted by the system.

This discrete set of vectors must be closed under vector addition and subtraction.

The generalized coordinates form a discrete set of variables that define the configuration of a system.

In quantum mechanics, the canonical ensemble affords a simple description since diagonalization provides a discrete set of microstates with specific energies.

Practicality dictates that designers must choose from a discrete set of methods to teach and support learners.