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We consider different types of processes obtained by composing Brownianmotion $B(t)$, fractional Brownian motion $B_{H}(t)$ and Cauchy processes $%C(t)$ in different manners.  We study also multidimensional iterated processes in $\mathbb{R}^{d},$ like,for example, $\left( B_{1}(|C(t)|),...,B_{d}(|C(t)|)\right) $ and $\left(C_{1}(|C(t)|),...,C_{d}(|C(t)|)\right) ,$ deriving the corresponding partialdifferential equations satisfied by their joint distribution.  We show that many important partial differential equations, like waveequation, equation of vibration of rods, higher-order heat equation, aresatisfied by the laws of the iterated processes considered in the work.  Similarly we prove that some processes like $%C(|B_{1}(|B_{2}(...|B_{n+1}(t)|...)|)|)$ are governed by fractional diffusionequations.

Equations of Mathematical Physics and Compositions of Brownian and Cauchy processes