CURVES

   cvs1   Velocity vectors, velocity on parabola, movie of cycloid.

   cvs2a   Compound motions, yoyo on helix.
   cvs2b   Another example of compound motion.

   cvs3   Arc length, polygonal line approximation, numerical 
          integration. 2D example and 3D example.
   
   cvs4   Acceleration, decomposition into tangential and normal 
          components. 

   cvs5   Curvature, 2D examples, parabola and another curve.

   cvs6   Curvature, 3D example.

   cvs7   Curvature, 3D example.

                     
                   FUNCTIONS OF TWO VARIABLES

   fun1   Graphs and level curves, two examples.

   fun2a   Partial derivatives, slices of surface, smooth function
   fun2b   Partial derivatives, surface with a ridge, f(x,y) = |x|y.

   fun3   Directional derivatives

   fun4   Gradient vector field, two examples in 2D

   fun5   Gradient vector field, example in 3D

   fun6   Tangent plane approximation with numerical calculation 
          of error.

   crit1  graphs and level curves of  f(x,y) = x^2 + 2bxy +y^2 for 
          various values of b.

   crit2  graph and level curves of f(x,y) = 4xy +2x^2y - xy^2 

   crit3   Using contour maps to estimate and characterize critical pts.

   crit4   Max and min of f(x,y) = x^2 +y^2 + y^3 on a rectangle .

   crit5   Using contour maps to estimate solutions of constrained
          optimization problem.

   crit6   Using level curves to estimate solutions of constrained
          optimization problem, second example


                          INTEGRATION

   int1   Approximation of integral by Riemann sums using the
          midpoint rule on each subrectangle

   int2   Transformation of a rectangle by a mapping. Approximation
          of area of image by linear approximations of the 
          transformation on subrectangles


                           VECTOR FIELDS

   vec1  Examples of vector fields in 2D: Rotational flow, a radial
 vector field, and the electric field produced by two line charges.

   vec2  Examples of vector fields in 3D: Rotational flow, 
 gravitational field, electric field produced by two point charges.

   vec3  Curl of 2D vector fields: Shear flow. Two examples of
counter clockwise rotational flow, one with positive curl, the
other with negative curl. A more general vector field.

  vec4  Line integrals and a conservative vector field. An 
interactive way to plot polygonal paths and line integrals of
a conservative vector field

  vec5  Line integrals and a nonconservative vector field.

  vec6  Divergence of 2D vector fields: Accelerated flow, 
a radial vector field, and a more general vector field.

  vec7  Flux through a boundary. A 2D vector field and an
interactive to compute the flux through the boundary of
a polygon.

  vec8  An interactive way of showing divergence by following 
an area carried by a flow. ( div(F) > 0).

  vec9  Same as vec8, but with vector field with div(F) < 0.