In Chinese tradition, some numbers are considered lucky, many are believed to be unlucky. The number 8, for example, is believed to be lucky as it sounds like 'fortune' ehnr in Mandarin and Cantonese. The number 4, on the other hand, is believed to be unlucky as it sounds like 'death'.

Gravitas: Why 4 is considered an evil number in China

Mathematician Day was declared by former Indian Prime Minister Manmohan Singh during the inaugural ceremony of the celebrations to mark the 125th anniversary of mathematician genius

National Mathematics Day: Srinivasa Ramanujan and his exceptional life

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Gravitas: Why 4 is considered an evil number in China

National Mathematics Day: Srinivasa Ramanujan and his exceptional life