### WildLinAlg21: More bases of polynomial spaces

Polynomial spaces are excellent examples of linear spaces. For example, the space of polynomials of degree three or less forms a linear or vector psace which we call P^3. In this lecture we look at some more interesting bases of this space: the Lagrange, Chebyshev, Bernstein and Spread polynomial basis. The last comes from Rational Trigonometry.This is one of a series on Linear Algebra given by N J Wildberger of UNSW.CONTENT SUMMARY: pg 1:? @00:08 Introduction review; polynomials of degree 3; Lagrange, Chebyshev, Bernstein, spread polynomials; basis: standard/power, factorial, Taylor; Lagrange polynomials developed 02:18;pg 2: @03:53 Lagrange developement continued; evaluation mapping;pg 3: @06:13 Lagrange developement continued; polynomials that map to the standard basis vectors e1,e2,e3,34 (Lagrange interpolation polynomials);pg? 4: @09:12 Lagrange basis; Polynomial that goes through four desired points;pg 5: @11:39 Uniform approximation and Bernstein polynomialspg 6: @13:42 reference to Pascal's triangle; Bernstein polynomials (named); Bernstein basis;pg 7: @16:37 view of Bernstein polynomials;pg 8: @18:06 Show that Bernstein polynomials of a certain degree do form a basis for that corresponding polynomial space; Pascal's triangle;? Unnormalized Bernstein polynomials; WLA21_pg8_theorem (Bernstein polynomial basis);pg 9: @21:04 How Bernstein polynomials are used to approximate a given continuous function on an interval;pg 10: @24:13 Chebyshev polynomials; using a recursive definition; Chebyshev polynomial diagram;pg 14: @36:56 Spread polynomials relation to Chebyshevs; Spread polynomials advantage over Chebyshev; Pascal's array; Spread polynomials as? a source of study @39:17;pg 15: @39:43 Spread basis; change of basis matrices; moral @42:15 ;pg 16: @42:40 exercises 21.1-4 ;pg 17: @43:44 exercises 21.5-7 ; closing remarks @44:38 (THANKS to EmptySpaceEnterprise)

Length:
45:52