On this day, 378 years ago, on November 30, 1647 (November 5, 1647, the pioneer of integral science, Cavalieri, passed away. Caballeri, the pioneer of integrology, passed away on November 30, 1647. Born in Milan in 1598, he died on November 30, 1647 in Bologna. In 1616, he devoted himself to studying the works of Euclid, Archimedes, Papus and others in the monastery of Pisa. Later, he met Galileo and learned a lot from his interactions. He claimed to be a student of Galileo. In 1620, he went to the Monastery of San Girolamo in Milan to teach theology and was praised for his profound knowledge. From 1623 to 1629, he served as abbot in Lodi and Parma. He hopes to get a mathematics chair in college. Later, after many twists and turns, under Galileo's strong recommendation, he finally got his wish. He was professor of mathematics at the University of Bologna from 1629 until his death. Cavalieri's greatest contribution was the establishment of the principle of inseparability. Using this principle, he calculated the area equivalent to the n-power of the curve y=x, solving many problems that can now be solved by more rigorous integration methods. Comment: Italian mathematician. One of the pioneers of integral science