Littlewood-type problems on subarcs of the unit circle Peter BorweinTamas Erdelyi Littlewood-type problemsunit circletransfinite diameterintegersdiophantine approximationChebyshevpolynomialrestricted coefficient-101 coefficients01 coefficients Indiana University Mathematics Journal 1997 text pdf 10.1512/iumj.1997.46.1435 10.1512/iumj.1997.46.1435 en Indiana Univ. Math. J. 46 (1997) 1323 - 1346 state-of-the-art mathematics http://iumj.org/access/