Around the Mukai conjecture for Fano manifolds

As a generalization of the Mukai conjecture, we conjecture that the Fano manifolds $X$ which satisfy the property $ρ_X(r_X-1)\geq\dim X-1$ have very special structure, where $ρ_X$ is the Picard number of $X$ and $r_X$ is the index of $X$. In this paper, we classify those $X$ if $ρ_X\leq 3$ or $\dim X\leq 5$.

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