Symbol in context

$P_{a,t}$

This entry links every published equation using this exact notation. Its meaning may change between equations.

Meanings in context

Article-grounded definition

the population in age group a at time t.

P_{a+1,t+1} = P_{a,t}\, S_{a,t} + M_{a,t}

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

P_{a,t}

the population in age group a at time t.