Skip to main content\(\newcommand{\R}{\mathbb{R}}
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A three-dimensional plot of a helix extending in the vertical direction and curling with a circular radius of 1 is shown in green. A curve in that extends above the green helix for half of each turn and below the green helix on the other half of each turn is drawn in blue. The vertical area between the green helix and the blue curve is shown by a yellow surface.