The number four is a common Chinese character. Its shape is simple and clear, consisting of a vertical line and three horizontal lines. When writing, write a vertical line first, then a horizontal line, then a stroke to the left, then a vertical line to the right, and finally a horizontal line. This completes the basic form of the number four.
If you want to add an extension to the number four, you can add two horizontal lines and a square below it. These two horizontal lines can be parallel to the bottom horizontal line of the number four, and Si extends obliquely downward from the right side of the number four. The number four has become more diverse.
The number four is widely used in life. It can represent "4" in quantity, and it can also be used to represent "west" in the direction of "southeast and northwest". The number four can also be used to represent "morning", "afternoon" and "evening" of time. In mathematics, the number four also plays an important role. It is an important part of natural numbers and the basis of many mathematical formulas and theorems.
The number four is a very common and important Chinese character. Its form is concise and clear, and it is also widely used. The number 4 plays an important role in daily life and academic research.
The origin of numbers
As early as primitive times, people noticed the difference in the number of one sheep and many sheep, one wolf and the whole pack of wolves in production activities, and the concept of quantity gradually came into being with the passage of time. The formation of the concept of number may be as old as the use of fire, about 300 thousand years ago, which is as important to human civilization as the use of fire.
At first, people counted with ten fingers. When fingers are not enough, people begin to use "stone number", "knot number" and "notch number". After tens of thousands of years of development, it was not until about 5000 years ago that the writing and counting system appeared.
Ancient Egyptian hieroglyphics around 3400 BC; Babylonian cuneiform around 2400 BC; The number of Oracle Bone Inscriptions in China around 1600 BC; Greek Attica numbers around 500 BC; Around 500 BC, China had a plan to calculate numbers; Indian Brahman statue around 300 BC and Maya statue of unknown age.
These numeration systems use different decimal systems, among which Babylonian cuneiform numerals use sexagesimal, Mayan numerals use decimal system, and others use decimal system. The appearance of counting system has made human civilization take a big step forward. With the continuous development of productive forces and the continuous improvement of figures, mathematics has gradually developed.