DIARY 4/30: public safety, "fermat's last theorem"

Today, I’ve been working all day, but I went to bank in order to deposit some money.
I don’t like use ATM because I’m worry about security. In some case, when we use ATMs outside, our credit card may be skimmed by someone. I think that Japanese safety is splendid.

Why Japanese society is safer than other countries?
I think that is because of Japanese culture and equality of wealth.
First of all, Japanese are very polite and sensible (some people are not, though). Japanese education is very good for keep such nationality.
However, I believe the second reason is more important to keep the society safe. Equality of wealth is very essential for society to keep safe. If there are many poor people in the countries, the crime rate would be higher and higher. I guess the U.S. inequality level is very high, in other words, the society is not equitable one. I think poor people relatively tend to crime a law because they have to live their lives, have to eat, drink, ware clothes, get some place to sleep. Economic system sometimes put them into a difficult situation.

I think the countries need to think about not only the system maintain public securities but also how to do away with inequality.

To change the subject, I found a YouTube channel which explains “Fermat’s Last Theorem”.
The theorem is a historical difficult problem regarding mathematics.

There are no natural numbers, X, Y, Z such that X^n+Y^n=Z^n, in which n is a natural number greater than 2

It was proposed by Fermat in the form of a note scribbled in the margin of his copy of the ancient Greek text Arithmetica. I was surprised that Fermat was not a mathematician but a lawyer. He was not a professional of mathematics. Many great mathematicians challenged the theorem but they couldn’t solve it. It took about 300 years to solve it after the proposal. The person who solved it was Andrew Wiles. He was genius mathematician. He found the theorem when he was 12 years old. He found this theorem and he decided to become a mathematician. He was eager to solve it by himself so, after he became a professor, he made time to think about the theorem. He used his all time to prove it but he tried to prove it in secret. He wanted to solve it by his own hand.
I also think considering about mathematic problem is very fun, but the greatest mathematicians truly love thinking.