This article is cited in 2 papers

A cyclic sum with 12 terms

E. K. Godunova, V. I. Levin

Moscow State Pedagogical Institute

Abstract: The inequality
$$ \sum_{i=1}^{12}\frac{x_i}{x_{i+1}+x_{i+2}}\ge6 $$
is proved for all $x_i\ge0$, $x_i+x_{i+1}>0$ where $x_{12+i}=x_i$

UDC: 517.5

Received: 16.12.1974

 English version: Mathematical Notes, 1976, 19:6, 510–517

Bibliographic databases:

• 
•