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then,
: {{NumBlk|::|<math> x_1(n_1,\ldots,n_M) x_2(n_1,\ldots,n_M) \overset{\underset{\mathrm{FT}}{}}{\longleftrightarrow} \frac{1}{(2\pi)^M} \int \limits_{-\pi}^\pi \cdots \int\limits_{-\pi}^\pi X_1(\omega_1 - \theta_1,\ldots,\omega_M - \theta_M) X_2 (\theta_1, \ldots, \theta_M) \, d\theta_1 \cdots d\theta_M</math>|{{EquationRef|MD Convolution in Frequency Domain}}}}
or,
: {{NumBlk|::|<math> x_1(n_1,\ldots,n_M) x_2(n_1,\ldots,n_M) \overset{\underset{\mathrm{FT}}{}}{\longleftrightarrow} \frac{1}{(2\pi)^M} \int\limits_{-\pi}^\pi \cdots \int\limits_{-\pi}^\pi X_1(\theta_1,\ldots,\theta_M) X_2(\omega_1 - \theta_1,\ldots,\omega_M - \theta_M) \, d\theta_1\cdots d\theta_M</math>|{{EquationRef|MD Convolution in Frequency Domain}}}}
====Differentiation====
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