Were Omar Khayyám and Zhu Xi alive at the same time?
Yes. Omar Khayyám and Zhu Xi were alive at the same time for 1 years, from 1130 to 1131.
Zhu Xi was 1 when Omar Khayyám died.
Zhu Xi
Chinese historian, neo-Confucian philosopher, poet, and politician during the Song dynasty
Born 18 October 1130 · died 23 April 1200, aged 69