ahvonenj/double_helix.txt

## double_helix.txt
No, my question was the formula for a curve with the double
helix structure;  I believe this is the answer to my question:
(quoting from a letter to me:)

A helix is a circle that moves up with time.  Hence the equations

x(t) = sin t
y(t) = cos t
z(t) = t

describe a helix.  A double helix is two helices that are offset by half
a turn.  The equations for the second helix would then be

x(t) = sin t
y(t) = cos t
z(t) = t + \pi
	No, my question was the formula for a curve with the double
	helix structure; I believe this is the answer to my question:
	(quoting from a letter to me:)

	A helix is a circle that moves up with time. Hence the equations

	x(t) = sin t
	y(t) = cos t
	z(t) = t

	describe a helix. A double helix is two helices that are offset by half
	a turn. The equations for the second helix would then be

	x(t) = sin t
	y(t) = cos t
	z(t) = t + \pi