The working group led by Yu Min has a slide rule and forgets to eat and sleep. After more than four years of unity and cooperation, they have solved a series of basic problems in the combustion of thermonuclear materials, gained a deep understanding of many basic phenomena and laws of hydrogen bombs, and published more than 60 papers.
At that time, the computer performance was unstable. When the machine jumps, the calculation result is inaccurate and the calculation time is limited. Time is wasted again and again.
Once the machine jumps, the solution is to take out the calculation results of the previous moment in the drum as the initial condition for computer recalculation to reduce the machine time loss.
China attaches great importance to mathematics, physics, all kinds of engineering textbooks and manual calculation in exams. Maybe there was no computer at that time, and so was the textbook.
Undergraduate students often write two or three pages of advanced mathematics, circuits and engineering mechanics. Math textbooks in Europe and America generally take matlab, etc. The Tongji version of advanced mathematics commonly used in China is calculated by hand.