Originally Posted By: paul


is this the equation your talking about?


if so I suppose that the "d" in the formula has no real value because so far I havent been able to find just what is used to put where the "d" 's are. !!!



The d's don't have values, per se, because in that usage, d is an operator (roughly, like + or -). Actually, they are PART of an operator. It's first semester calculus.

It's a *unary* operator, so it doesn't sit between two operands. Instead, it sits before the operand.

d()/dt is an operator that means the "differential" of something "with respect to" t. For example, d(p)/dt means the change in momentum given an "infinitesimally" small change in time.