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3.2.1 Zero-points All zero-points of the selected function will be detected. In addition to the x-value you will also get the following information about the type of the zero-point: -+ (crossing x-axis from - to +) +- (crossing x-axis from + to -) ++/-- (Touching x-axis from the positive/negative sector). All other discussion-parts are based on the zero-point detection.