Or to change the figure, total science is like a field of force whose boundary conditions are experience.

What were the "boundary conditions" at the beginning of time?

In order to solve the model, boundary conditions are needed.

The other difference relates to the change of boundary conditions.

Boundary conditions are needed at the bed and the free surface in order to close the system of equations.

To find a unique solution we need four boundary conditions.

Using boundary conditions, this may be modeled in two ways.

All four cases have the boundary condition for the temperature at the base.

The forecast is run every 3 hours using boundary conditions from the 25-km global model.

There's a major boundary condition trying to impose itself here.