We study Bott-Chern and Aeppli cohomologies of a vector space endowed with two anti-commuting endomorphisms whose square is zero. In particular, we prove an inequality a la Frolicher relating the dimensions of the Bott-Chem and Aeppli cohomologies to the dimensions of the Dolbeault cohomologies. We prove that the equality in such an inequality a la Frolicher characterizes the validity of the so-called cohomological property of satisfying the partial derivative(partial derivative) over bar -Lemma. As an application, we study cohomological properties of compact either complex, or symplectic, or, more in general, generalized-complex manifolds.
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