To maintain her fitness, Maria goes to the gym on a regular basis.

To prove the theorem, we first show that the Borel set in question is outer regular by approximating it from above with open sets.

On a locally compact Hausdorff space, the Borel measure is inner regular, so the measure of any Borel set equals the supremum of the measures of compact subsets contained in it.

In the course, we studied regular functions and their role in solving differential equations.

Mathematicians often study regular tessellations to understand symmetry and patterns in the plane.

Research into cyclotomic fields revealed unexpected patterns among regular primes.

A regular prime often appears in discussions of cyclotomic fields and class-number problems.

To solve the partial differential equation numerically, we discretized the domain using a regular grid that aligned with the material interfaces.

In topology, a regular open set has the property that it equals the interior of its closure.

In many topology texts, a regular closed set is defined as a set that equals the closure of its interior.