Causal sets are used in the study of quantum gravity.

I love collecting boxed sets of my favorite TV shows.

The closed sets in this topology form a partition of the space.

There are multiple contrast sets in this experiment.

Convex sets are closed under convex combinations.

Discrete sets are used in mathematics to represent distinct and separate elements.

The dominating sets in the graph were identified and analyzed.

There are many down-sets in the collection of subsets.

The graph is defined by its edge sets.

I bought several gift sets for my friends.