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Euler's classical formula for convex polyhedra

$$v-e+f=0$$$v-e+f=2$$

where $v$ is the number of vertices, $e$ the number of edges and $f$ the number of faces of a convex triagulated polyhedron in $3$-space.

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Euler's classical formula for polyhedra

$$v-e+f=0$$

where $v$ is the number of vertices, $e$ the number of edges and $f$ the number of faces of a triagulated polyhedron in $3$-space.