Abstract
In this paper, we initiate the study of ${\mathcal{P}} R$-warped products in para-K a hler manifolds and prove some fundamental results on such submanifolds. In particular, we establish a general optimal inequality for ${\mathcal{P}}R$-warped products in para-K a hler manifolds involving only the warping function and the second fundamental form. Moreover, we completely classify ${\mathcal{P}} R$-warped products in the flat para-K a hler manifold with least codimension which satisfy the equality case of the inequality. Our results provide an answer to the Open Problem (3) proposed in [19, Section 5].
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