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Paths are implemented as Bezier curves with control points , offering the ability to edit the tangent of a curve at each point . The naive generalization of the one-variable case leads to the notion of the multiplicity of a curve at a point . Next in tribal favour in the eastern region was the game known to the early traders under the corrupted Creek name of chunkee , in which one player rolled a stone wheel along the ground , while his competitor slid after it a stick curved at one end like an umbrella handle with the design of having the spent wheel fall within the curve at the end of its course . Dave - I do n't think you're behind the curve at all . At the ford , 1 mile below the turnpike bridge , the river , whose general course is northward , bends toward the west and continues in that direction half a mile , when , by a curve at right angles , it takes its previous northward course , and continues it for I mile or more to a ford at which the enemy crossed during the engagement Friday afternoon . This is a different approach here again with some curves at the entranceway and a different glassed-in approach at the top two or three stories . The methods themselves may be familiar to students from their mathematics courses , but they may have forgotten the material or never made the connection between a statement such as " the derivative of a curve at a given point is the slope of the line tangent to the curve at that point " and the way that one might evaluate such a derivative . In the 17th century Newton and Leibniz created calculus , with its techniques for " differentiating " or finding the derivative of functions - - in geometric terms , finding the tangent of a curve at any given point . The slope of a curve at a point is said to be the same as the slope of the tangent line to the curve at that point .