Characteristic Jacobi operator on almost Kenmotsu $3$-manifolds

Differential geometry of homogeneous manifolds (53C30) Global Riemannian geometry, including pinching (53C20) General geometric structures on manifolds (almost complex, almost product structures, etc.) (53C15) Almost contact and almost symplectic manifolds (53D15) Local Riemannian geometry (53B20)

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Characteristic Jacobi operator on almost Kenmotsu \(3\)-manifolds