These theoretical calculations may appear arcane, but they really do have an impact on issues such as capital spending in lots of companies.

He was unusual in being equally adept at theoretical calculations and at carrying out experiments to explore how his calculations worked in practice.

Several theoretical calculations imply that some elements with 120 protons or more could be stable and unlike their atomic neighbours not break apart in a matter of seconds.

This work on the spectroscopy of simple molecular ions provided accurate measurements with which theoretical calculations could usefully be compared.

There are theoretical calculations that can be used to derive internal conversion coefficients.