1, number is a mathematical concept, which means counting or describing the quantity of an object. In ancient times, people only knew the number of objects themselves at first, such as a few sheep and trees. People gradually need to use mathematics to describe more complex phenomena, such as astronomical observation and engineering construction. , so the concept of "number" gradually expanded to a wider range of fields such as real numbers and complex numbers.
2. In basic mathematics, "number" usually refers to a non-negative integer and its proper subset, which can be expressed as the set 1, 2,3, etc. , where each element is called "number" and the whole set is called "set of numbers". According to different definitions, "number" can also be extended to negative numbers, rational numbers, irrational numbers, transcendental numbers and so on.
3. The concept of "number" not only applies to mathematics, but also permeates other disciplines. For example, in computer science, data is the carrier of information, and the processing and analysis of data is one of the important tasks of computer science; In physics, the measurement and calculation of physical phenomena is an important means to acquire knowledge.
Function of strokes
1, strokes are the basic elements of Chinese characters. Chinese characters are composed of strokes, and each stroke has its own unique form and meaning. For example, "horizontal" strokes mean horizontal or equidistant, "vertical" strokes mean vertical or equal height, and the strokes are combined together in a certain order and way to form various Chinese characters. Stroke is the basic element of Chinese characters. Without strokes, there would be no Chinese characters.
2. Stroke has the function of expressing word meaning. Chinese characters are ideographic characters, and each Chinese character has its own unique meaning. For example, the word "sun" means the sun, the word "moon" means the moon, and the word "water" means water. The meaning of these Chinese characters is expressed by strokes. Changes in the shape, size and direction of strokes can convey different meanings and information.
3. Stroke has the function of conveying information. In Chinese character writing, the order and way of strokes are fixed, and different combinations of strokes can form different Chinese characters. For example, the word "mouth" consists of a horizontal fold, a horizontal fold and a vertical fold, and the word "eye" consists of a vertical fold and a horizontal fold.