👉 In mathematics, a Schwarz function is a type of real-valued function that is continuous on an open subset of the complex plane and which takes values in the set of integers. These functions are named after Hermann Schwarz, who first defined them in 1904.
A Schwarz function can be represented as a piecewise linear function, where each segment represents a region of the complex plane. The values of the function at points on this segment represent its sign (positive, negative, or zero
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