A NEW 3-PARAMETER CURVATURE CONDITION PRESERVED BY RICCI FLOW
A NEW 3-PARAMETER CURVATURE CONDITION PRESERVED BY RICCI FLOW
In this paper, we firstly establish a family of curvature invariant conditions lying between the well-known 2-nonnegative curvature operator and nonnegative curvature operator along the Ricci flow. These conditions are defined by a set of inequalities involving the first four eigenvalues of the curvature operator, which are named as 3-parameter …