Related articles:
Planar graph
Platonic solid
Surface
Dodecahedron
Octahedron
Polyhedron
Icosahedron
Tetrahedron
Leonhard Euler
Torus
Key terms:
chi
faces
edges
graph
euler characteristic
proof
finite
minus
homology
mathematics
sphere
vertices
topological
planar
cdot
polyhedron
manifold
theorem
convex
geometry
mathcal
pentagons
hexagons
triangle
colon
sheaf
poset
strata
projective
invariant
more generally
betti number
algebraic
compact space
covering space
euler class
cardinality
scriptstyle
alternating sum
stratified space
planar graph
homeomorphic
product property
decomposition
number of vertices
polyhedral surface
multiplication
homotopy equivalent
euler characteristic of any
euler characteristic of a finite
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