The equations have periodic solutions and do not have a simple expression in terms of the usual trigonometric functions, although they are quite tractable.
If none of the non-negative parameters α,β,γ,δ vanishes, three can be absorbed into the normalization of variables to leave but merely one behind: Since the first equation is homogeneous in x, and the second one in y, the parameters β/α and δ/γ, are absorbable in the normalizations of y and x, respectively, and γ into the normalization of t, so that onlyα/γ remains arbitrary. It is the only parameter affecting the nature of the solutions.
A linearization of the equations yields a solution similar to simple harmonic motion[26] with the population of predators trailing that of prey by 90° in the cycle.
The equations have periodic solutions and do not have a simple expression in terms of the usual trigonometric functions, although they are quite tractable. If none of the non-negative parameters α,β,γ,δ vanishes, three can be absorbed into the normalization of variables to leave but merely one behind: Since the first equation is homogeneous in x, and the second one in y, the parameters β/α and δ/γ, are absorbable in the normalizations of y and x, respectively, and γ into the normalization of t, so that onlyα/γ remains arbitrary. It is the only parameter affecting the nature of the solutions.A linearization of the equations yields a solution similar to simple harmonic motion[26] with the population of predators trailing that of prey by 90° in the cycle.
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