Используйте «intersection point» в предложении

1. the intersection point of two lines is the simplest form of a singularity, the point within a circle can

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2. Points where the line is tangent to the curve count as two intersection points (even though it looks like only one in Figure 7-6), so if a tangent line touches the curve only one more time it is still counted as “intersecting three times

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3. For one of the combinations, the weights obtained using both the convex and the original functions are the same (this combination is situated at the intersection point of the original and the convex function)

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