"[math](E)^2=(\overrightarrow{p}c)^2(mc^2)^2[/math] E=mc2 addresses only the very special case of mass at rest, and so is not very useful in any actual physics problem. I also find it deeply amusing that Einstein's original paper in which he announced his mass-equals-energy insight, "Does the Inertia of a Body Depend on Its Energy Content?", uses L in place of E, and for some odd reason never actually gives the equation! Instead, Einstein uses a sentence only to describe an equivalent equation with c on the other side:"
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Terry Bollinger
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