Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 134
e, A^B, will become flatter, the points T and T/will approach each other, and will finally unite, as at T, on AB;T being a point of inflexion, or change of curvature. If the cutting plane recedes still further from the gorge, thecurve will be, as at AB, so flat that no tangent ray can be drawnto… … PI X
Shades and shadows
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