Researchers in computers, chips or anything related to the military industry ‘need to be especially careful’, Shanghai native warns

Mathematician Zhang Yitang, who joined Sun Yat-sen University in Guangzhou from California in June, has called the wave of Chinese researchers exiting the US a “positive trend”.

Zhang, known for his prime number research, told Phoenix TV, a partially state-owned broadcaster, in a programme aired on Monday that he had been thinking about returning to the mainland “in light of recent international political issues that have strained China-US relations”.

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