Comments on Fano varieties with torsion in $H^3(X,\mathbb{Z})$ by J. C. Ottem and J. V. Rennemo

János Kollár

Ottem and Rennemo constructed a Fano 4-fold with torsion in $H_2(X,\mathbb{Z})$. We simplify the computation of $H_2(X,\mathbb{Z})$ and also exhibit 2 lines $L^{\prime },L^{\prime \prime }\subset X$ such…