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Working paper

A criterion for left-orthogonality of an effective divisor on a surface

arxiv.org. math. Cornell University, 2016. No. 1610.02325.
We fi nd a criterion for an eff ective divisor D on a smooth surface to be left-orthogonal or strongly left-orthogonal (i.e. for the pair of line bundles (O;O(D)) to be exceptional or strong exceptional).