Partial differential equations on metric graphs represent a set of one-dimensional partial differential equations with appropriate boundary conditions. This article aims to define the concept of metric graphs and partial differential equations on such graphs. Additionally, we review some mathematical studies concerning reaction-diffusion equations on metric graphs. Notably, the behavior of solutions for these equations on metric graphs differs considerably from that in the one-dimensional case. Finally, we discuss the findings regarding a single reaction-diffusion equation on star-shaped metric graphs and propose an approach to investigate all stationary solutions for a single reaction-diffusion equation on arbitrary metric graphs.
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