Definition:Subset/Notation

Notation for Subset
Notation in the literature for the concept of a subset can be confusing.

On, the convention is as follows:


 * $\subseteq$ is used for the general subset
 * $\subsetneq$ or $\subsetneqq$ is used for the concept of a proper subset.

The notation $\subset$ is deprecated on, on the grounds that it can mean either.