Book (Practical) Nihon Essay Essay Fukugakusanpo / Mayumi

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Nihon Essay / Essay : This is a mathematical essay for adults that contains 50 mysterious stories about "numbers"! I feel that the speed of passing is different between a year when I was a child and a year when I became an adult. Why is that? A year at the age of 5 is one fifth of my life, 30 is one thirtieth, and 90 is one nines. The ratio of one year to life time is completely different. In other words, the relative length of one year becomes shorter and shorter depending on the number of years I have lived, and I feel that time is faster. "Mathematics is not about memorizing the technique of calculation by heart, but the experience of various ways of looking at things" (this book, 『, Introduction, 』). If you take a walk in the world of mathematics, you may see something completely different from what you have seen until now.