In algebraic topology, the Euler characteristic is a topological invariant(in fact, homotopy invariant) defined for a broad class of topological spaces.
Note however that the partial computable functions(those that need not be defined for all arguments) can be explicitly enumerated, for instance by enumerating Turing machine encodings.
Each indicator may be viewed in the form of a graph or table. Each one is accompanied by a definition(mode of calculation) and the source of the figures.
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