摘要
It was shown by Vietoris[1] in 1958 that for n ≥ 1 and x ∈ (0, π),
n∑k=0ckcos(kx)>0,(1)
出处
《数学进展》
CSCD
北大核心
2005年第2期253-255,共3页
Advances in Mathematics（China）
基金
Foundation item: This work was supported by a grant from Australian Research Council. The third named author was also supported by NSFC.
