Vì sao ngày 9/9 đặc biệt?
nh minh họa của kramnik.com.Với những nền văn hóa coi 9 là con số may mắn, ngày hôm nay đã được chờ đợi từ lâu. Về lý thuyết thì ngày 9/9/2009 chẳng có gì đặc biệt, song nó lại có nhiều điều thú vị trên phương diện toán học và lịch sử.Chiếm vị trí cuối cùng trong hệ thống chữ số, song số 9 có vai trò khá đặc biệt. Đối với nhiều nền văn hóa nó tượng trưng cho sự bao dung, lòng trắc ẩn và thành công. Tuy nhiên, những chuyên gia về số khẳng định số 9 cũng được gắn với thói kiêu ngạo và ích kỷ.
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