What's the definition of an equilibrial population?

Answer 1

Population that sustains itself without increasing or decreasing
In Game theory it could refer to the weighted avergae considered due to the poluation size overcoming the disadvantage of strategy but enough to exactly neutralise the opponent

In any model of Math, the Population equilibrium occurs in the model when neither of the population levels is changing, i.e. when both of the differential equations are equal to 0

The most popular one is The Lotka-Volterra equations, also known as the predator-prey equations. They are a pair of first order, non-linear, differential equations frequently used to describe the dynamics of biological systems in which two species interact, one a predator and one its prey. They were proposed independently by Alfred J. Lotka in 1925 and Vito Volterra in 1926.

where

y is the number of some predator (for example, wolves);
x is the number of its prey (for example, rabbits);
dy/dt and dx/dt represents the growth of the two populations against time;
t represents the time; and
α, β, γ and δ are parameters representing the interaction of the two species.

Answer 2

Equilibrium means that everything is in equal stance. So this must mean that either:
*Each race is equal
*There are just about an equal amount of males and females in a certain area

Answer 3

The theory that speciation occurs in spurts of major genetic alterations that punctuate long periods of little change.

Answer 4

deaths=births