New posts in Euler Characteristics

Euler characteristic of the simplicial complex of sets of elements in a semilattice with non-zero meet

In Gromov-Witten theory, why is the string coupling constant weighted by $2g-2$?

Did ancient mathematicians know Euler's characteristic for convex polyhedra?

Multiplicativity of Euler characteristic for non-orientable fibrations

For which classes of topological spaces Euler characteristics is defined?

Is there a topological description of combinatorial Euler characteristic?