The model equation (1) shows the relationship between local and external stresses.

This equation shows that the perimeter is proportional to the length of a side.

The following equations show the relationship between these two functions:

The preceding equation finally shows the determination of income in a closed system without public sector.

Later, Maxwell's equations showed that light is an electromagnetic wave.

For sure this equation will show that each electron has its address around the nucleus.

This equation shows how the electric and magnetic fields have to do with each other.

The flow-of-funds equation shows the components of any change in money supply.

The last two equations show that this is not true.

This equation shows the correlation between mass and energy, with a simple constant.