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Wave equation in one space dimension

The wave equation in one spatial dimension can be written as follows: ∂ 2 u ∂ t 2 = c 2 ∂ 2 u ∂ x 2. {\displaystyle {\frac {\partial ^{2}u}{\partial t^{2}}}=c^{2}{\frac {\partial ^{2}u}{\partial x^{2}}}.} This equation is typically described as having only one spatial dimension x, because the only other independent variable is the time t.