When and where did Huang Yanpei put forward the periodic rate of China's historical decline?

The problem of historical periodic law was put forward by Mr. Huang Yanpei 1945 to Mao Zedong in Yan 'an. Mr. Huang Yanpei asked Chairman Mao whether China's * * * production party can jump out of the historical periodic law of "its prosperity is boundless and its death is sudden". Comrade Mao Zedong replied: Yes, this is democracy.