Definition:Underlying Set

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Definition

Abstract Algebra

Let $\struct {S, \circ}$ be an algebraic structure.

Then the underlying set of $\struct {S, \circ}$ is the set $S$.


Relational Structure

Let $\left({S, \mathcal R}\right)$ be a relational structure.

Then the underlying set of $\left({S, \mathcal R}\right)$ is the set $S$.


Metric Space

Let $M = \struct {A, d}$ be a metric space.

Then the underlying set of $M$ is the set $A$.


Topological Space

Let $T = \struct {S, \tau}$ be a topological space.

Then the underlying set of $T$ is the set $S$.