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Sir, I request you to post a pdf on the topic "Combinatorial Geometry".It would help a lot. Thanks, in advance.

about IMOSL \( 2009/11 \) (see list of errors): first, it seems to prove \( Q \ge m * 2^{m+2}. \) So \( |F|> \sum F_i \) meant we can’t equality (look to \( m=1 \) for a trivial observation for this). hence we will have to make a stronger argument for this, anyone who can help to make this problem will be clear?