Subset/Examples/British People are Subset of People

Example of Subset

Let $B$ denote the set of British people.

Let $P$ denote the set of people.

Then $B$ is a proper subset of $P$:

$B \subsetneq P$

Sources

• 1965: J.A. Green: Sets and Groups ... (previous) ... (next): $\S 1.2$. Subsets: Example $9$