The historical facts surrounding integral calculus, which was born from the simple desire of ancient people to find the internal area of ​​a shape, are unraveled in an interesting story.
In particular, by showing that the birth of integral calculus 400 years ago was not simply the result of the brilliant genius of a single mathematician, but rather the efforts of countless mathematicians over a long 2,000-year history, it is structured to enable a more open approach to mathematics.
In addition, it vividly depicts not only the necessity of integration and the meaning of integration contained in the integral symbol, but also which is wider between a square pizza and a round pizza, how to find the area of ​​a parabola, how the integral symbol was created, and what Cavalieri's principle is, by connecting it to real life and making it look like a picture book.