Mapping/Examples/Population of Nation

Example of Mapping

Let $T$ be the set of all times.

Let $N$ be a nation in the world.

Let $P: T \to \N$ be the mapping defined as:

$\forall t \in T: \map P t = \text {the population of $N$ at time $t$}$

Sources

• 1972: Murray R. Spiegel and R.W. Boxer: Theory and Problems of Statistics (SI ed.) ... (previous) ... (next): Chapter $1$: Functions: Example 1