The equation is usually written so that A 0, by convention.

The main equation is written by using the total number of the hidden objects given.

The equation is written between any two points a and b in a system that contain the same fluid.

The grand equation that unified all physics had long since been written.

The general equation of diversity is often written in the form:

By saying these changes are infinitesimally small, the equation can be written in differential form.

This equation can also be written in the conservative form:

They say you are writing equations that will one day remake the world.

Maxwell's equations can be written in the form of a wave equation with sources.

This is convenient when writing equations for nuclear reactions, in order to show the balance of charge more clearly.