ACTA issues

## On optimal Lebesgue function type sum

Wang Quanlong

Acta Sci. Math. (Szeged) 63:3-4(1997), 487-495
5779/2009

 Abstract. This paper shows that optimal Lebesgue function type sum $\Lambda_n(\chi ^*,x)$ must equioscillate and gives the optimal set of nodes and the exact value of $\lambda_n(s)$. AMS Subject Classification (1991): 41A05 Received October 25, 1996 and in revised form May 7, 1997. (Registered under 5779/2009.)