## Two categories of BC:

__Initial Value Problem__(IVP): all*yi*are given at some starting point*ts*, and solution is needed from*ts*to*tf*.__Two-point Boundary Value Problem__(BVP):*yi*are specified at two or more*t*, e.g. some at*ts*, some at*tf*(only one BC needed for each*y*).

## Generally, IVP much easier to solve than 2-pt BVP, so consider this first.