Heads up: In section "A polynomial of degree n is the sum of n+1 periodic functions" it says 'cdots' in two formulas. (Probably a backslash missing in the TeX(?

Heads up: In section "A polynomial of degree n is the sum of n+1 periodic functions" it says 'cdots' in two formulas. (Probably a backslash missing in the TeX(?) source.)