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- Thread starter ericm1234
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HallsofIvy

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"on pages 14-15" of

If u

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Let me rephrase:

there is a surface S in 3-d (x, y, z). This is cut by a plan parallel to the xz plane. This intersection of the plane and surface creates a curve C.

Now there is a picture showing the x and z axes with this curve C, and a tangent vector called U. U is decomposed into U sub X and U sub Z HOWEVER, U sub Z is 'equal' here to as 'partial f/ partial x' times U sub X.

So my question is why is U sub Z equal to partial f/partial x time U sub X.

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