We introduced integrals over parameterized curves. We first gave an
intuitive definition patterned after the Riemann integral of functions
of a real variable, then a formal definition using the derivative of
the parameterization function. We discussed invariances of the integral,
in particular under a change of the parameterization. We also gave
two upper bounds on the absolute value of an integral, one based on the
intuitive definition, and one on the formal definition of the integral.

HW: 38,39,42,43.