Double Dot

A pair of overdots placed over a symbol, as in x^.., most commonly used to denote a second derivative with respect to time, i.e., x^..=d^2x/dt^2.

See also

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Cite this as:

Weisstein, Eric W. "Double Dot." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/DoubleDot.html

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