This latter equation expresses the time variation of c with time.

The third equation expresses that pressure is constant along the binormal axis.

Hence the equation expresses the change in the predator population as growth fueled by the food supply, minus natural death.

The equation below expresses the long wave radiation balance Ql:

Thus, the equation relates the rate of change of the population, N, to the current population size, and expresses the effect of the two parameters.

It turns out, however, that the above equation for particle number expresses the number of bosons in excited states rather well, and thus:

Note that the last equation expresses the assumption of a universal time independent of the relative motion of different observers.

The Eyring equation, developed in 1935, also expresses the relationship between rate and energy.

This equation expresses the material derivative of the field, that is, the derivative with respect to a coordinate system attached to the moving surface.

The equations express the difference between the observed arrival times and those calculated from the initial estimated hypocenter.