8-24-05 [hiking math] - 1

8-24-05 [hiking math]

The gradient path is twist-free (I think it's called "roll" in flight-sim terms). The gradient path is perpendicular to the contour lines. The gradient takes you up the steepest path. If there were any twist, it would mean there would be a steeper path you could take by yawing in the direction of the twist incline.

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