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The gradient is a fancy word for derivative, or the rate of change of a function. Itâs a vector (a direction to move) that. 1  Points in the direction of greatest increase of a function (intuition on why)  Is zero at a local maximum or local minimum (because there is no single direction of increase)
Gradient lenses are characterized by a smooth transition from a solid color to a transparent shade of the same color. Solid colors, genuine since 1937, the classic G-15 was originally developed for military use, offers a high level of clarity, comfort and protection.