If you're interested in classical approximation with polynomials, check out Nick Trefethen's lectures on the subject. https://people.maths.ox.ac.uk/trefethen/a

If you're interested in classical approximation with polynomials, check out Nick Trefethen's lectures on the subject. https://people.maths.ox.ac.uk/trefethen/atapvideos.html https://people.maths.ox.ac.uk/trefethen/atapvideos.html Chebfun is pretty cool too! http://www.chebfun.org http://www.chebfun.org