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< On Monday the 10th of March, at 10.00 at V LO in Poznan, during the Science Festival, dr Jerzy Grzybowski will give a lecture entitled\\
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> On Monday the 10th of March, at 10.00 at V LO in Poznan, during the Science Festival, dr [[Jerzy Grzybowski]] will give a lecture entitled\\
On Monday the 10th of March, at 10.00 at V LO in Poznan, during the Science Festival, dr Jerzy Grzybowski will give a lecture entitled
Addition, subtraction and cancelling of convex sets.