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математика
пересекающее отсечение
математика
пересечение множеств
математика
теоретико-множественное пересечение
In analytic geometry, a line and a sphere can intersect in three ways:
Methods for distinguishing these cases, and determining the coordinates for the points in the latter cases, are useful in a number of circumstances. For example, it is a common calculation to perform during ray tracing.