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    $\begingroup$ There are examples of indecomposable rank $2$ vector bundles on $\mathbb{P}^5$ in characteristic $2$ due to Tango and Kumar-Peterson-Rao (independently). $\endgroup$ Commented May 18, 2012 at 19:33
  • $\begingroup$ Thanks, Mahdi, that's interesting. Does this generalize to projective spaces of higher dimensions? $\endgroup$ Commented Jun 1, 2012 at 21:24
  • $\begingroup$ No. If it did, then this problem would no longer be an open problem. $\endgroup$ Commented Aug 2, 2013 at 1:00