On an Extension of Shapiro's Cyclic Inequality

NguyenMinh Tuan, LeQuy Thuong
2009 Journal of Inequalities and Applications  
We prove an interesting extension of the Shapiro's cyclic inequality for four and five variables and formulate a generalization of the well-known Shapiro's cyclic inequality. The method used in the proofs of the theorems in the paper concerns the positive quadratic forms.
doi:10.1155/2009/491576 fatcat:ai3s2cjkpnfmzpzw4pjqhjpm6m