2: Curvature of a curve a=(x(s),y(s)) (param. by arc length)

if not param. by arc length need to divide this by ((x')^2+(y')^2)^(3/2)

3:On surface: x a smooth map, x a homomorphism, partial derivatives w.r.t u and v of x are lin. ind. then what do we call x and x^-1 (give soln as x and x^-1)

2: Name of the point of a curve a where k'(u)=0

3: What is given by the formula -(a'xa'').a'''/||a'xa''||^2

1: Integral from u0 to u of ||a'(u)||dt is the

1: If a'(u) does not equal 0 for all u in I then a is this type of curve

Question

Answer

Extra Info.

3: The name of the plane through a(s) spanned by t(s) and n(s)

2: If a is a plane param. by arc length, k(s) does not equal 0, then the radius of curvature is given by?

Centre of curvature given by a(s)+n(s)/k(s)

3: What is given by this formula: ||a'xa''||/||a'||^3?

2: Curvature k(s)=? (in terms of n and t) (use . for dot product)

2: The name of the curve whos evolute is the initial curve

1: The image a(I) of an open interval I also known as this

2: Where is the evolute singluar?

3: f:U->R smooth and gradf(p) does not equal 0, then p is called what?

3: Torsion defined by this formula (let torsion = T) (give both sides of equation)

2: Name of the point of a curve a where k(u)=0

2: Which vector do we obtain by rotating t(s) by pi/2

3: What is the name of the special surface given by a(v)=(f(v),0,g(v)), f(v) not 0, rotated about z axis to form S={(f(v)cosu,f(v)sinu,g(v))|u in R, v in I}

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