For example, how much are handicraft series and story series? How much is the handmade series more expensive than the story series, or how much is the story series cheaper than the handmade series? The little girl paid 100 yuan. How much money should she have left? This is all mathematical information.
Of course, mathematics must be inseparable from numbers, so it can also be said that everything that can be expressed by numbers is mathematical information.
Information characteristics:
Don't worry, although the information is uncertain, there are still ways to quantify it. According to the concept of information, people can conclude that information has the following characteristics:
1, the greater the probability P(x) of message appearance, the smaller the amount of information; Conversely, the smaller the probability of occurrence, the greater the amount of information. As you can see, the amount of information (which we refer to as I) is inversely proportional to the probability of message occurrence.
2. When the probability is 1, everyone in the world knows what happened, so the amount of information is 0.
3. When a message consists of several independent small messages, the information contained in this message should be equal to the sum of the information contained in each small message.