The logistic equation assumes that density dependence takes the form of negative feedback.

The Young equation assumes a perfectly flat and rigid surface.

The equation assumes steady state, that is the absence of velocity gradients.

This Riccati equation assumes the following form or a similar form:

As mentioned above, these equations assume that the Hamiltonian is time-independent.

The equations shown below, pertaining to each type of circuit, assume that an ideal op amp is used.

The equation of debt and decline assumes that once upon a time Americans lived within their means and saved for what they bought.

The equation assumes that fishing and natural mortality occur simultaneously and thus "compete" with each other.

This equation assumes a 3% yearly bleeding risk.

The following equations of motion assume that there is a system of particles governed by internal and external forces.