We use mathematics in everyday life. Therefore, it is not accidental that it is called the king of all sciences. Numbers are everywhere and we cannot imagine our world without them.

**15 interesting facts about mathematics**

- The first woman engaged in mathematics was Hypatia from Alexandria.

- Equal sign invented in 1557 by Robert Recorde.

- If you add numbers from 1 to 100, you get 5050.

- Residents of Taipei are officially allowed not to use the number four (4), because it is considered to be “unlucky number”, and its meaning incorporated with the word “death”. Therefore, there are many buildings with no 4th floor, and after the third one, there is a 5th floor.

- Muslim mathematician Al-Khwarizmi is considered to be “the Father of Algebra”

- Despite the fact that many educated people lived in the Roman Empire, there was no number 0 in their mathematics. It is hard to imagine how they managed their life without the number 0 (zero)

- You may have already heard this story somewhere before. George Dantzig when he was a doctoral candidate at the University of California, he was late for a lecture. Seeing on the board some equations, he mistakenly took them for homework. Arriving home, he solved them, although he found the task rather difficult. Bringing them to the next lesson, he learned that these were 2 math problems that had been considered unsolvable.

- Negative numbers first appeared in the “Nine Chapters on the Mathematical Art” in the period of Chinese Han Dynasty (202 BC- 220 AD)

- The ancient Egyptians did not use fractions.

- If you add up all the roulette numbers, you will get a mystical number of 666.

- Quadratic equations appeared in India 15 centuries ago.

- Euclid left many works on mathematics and geometry, which we still use. Interestingly, no information about Euclid himself was found.

- Rene Descartes introduced the concepts of real and imaginary numbers.

- Interestingly, the great emperor Napoleon Bonaparte left some mathematical works after his death.

- The Indian scholar Budhayana, who lived in the 6th century, is considered the first to use the Pi number.

- Johannes Widmann first recorded the classic signs of addition and subtraction. It happened about 500 years ago.

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