mathematical equations developed by Hendrik Lorentz and George Francis FitzGerald, closely related to the work of Albert Einstein. These equations, also known as the Lorentz-FitzGerald contraction, contain the hypothesis that a moving body exhibits a contraction in the direction of motion when itsvelocity is close to the speed of light. ((ILLUSTRATION)) —DMSMH Glossary (app. 14.7.90)