What regularity can be drawn from the development of Western Europe in the Middle Ages?

What regular knowledge can be drawn from the development of Western Europe in the Middle Ages is as follows:

1. 10 century ago, the monarchy in western Europe mainly included three levels of Roman law: king, pope and feudal vassal. This regime is based on Roman law, but the king is the monarch and enjoys the highest political power.

2. From10 century to 12 century, the monarchy in this period was based on Roman law, and it was completely equivalent to Roman law in legal system. This system is called "Holy Roman Law".

3. From12nd century to15th century, the monarch in this period was legally called "secular monarch".

From the 4th.15th century to17th century, the power of the church was greatly weakened, and the power of the secular monarch was also increased.

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Regularity refers to a universal and inevitable phenomenon or event obtained through observation, experiment and analysis. In nature and society, regularity is everywhere, including planetary motion, biological growth, climate change, economic cycle and so on. These phenomena and events all follow certain laws and patterns, and can be studied and described through mathematics, physics, biology, sociology and other disciplines.

There are different types and manifestations of regularity. A common one is periodicity, that is, phenomena or events show certain periodicity and rhythm in time.

For example, the rotation and revolution of the earth is the concrete manifestation of the periodic law, which is stable and regular in time and is the basis for people to make calendars and time calendars. Similar cycle laws also include the menstrual cycle of women and the growth cycle of animals.

Another common type is linear law, that is, the development of a phenomenon or event is directly or inversely proportional to time or other variables. For example, Newton's second law F=ma in physics is a linear law, and mass multiplied by acceleration equals acting force. Similar linear laws include the relationship between chemical reaction rate and reactant concentration.

In addition to periodicity and linearity, there are also nonlinear and chaotic laws. Nonlinear law means that the relationship between the development of phenomena or events and time or other variables is not a simple proportional relationship, but a more complex nonlinear relationship. For example, the Lorentz attractor in meteorology is a nonlinear law, which describes the mode of atmospheric convection.

Chaos law means that the development of phenomena or events is influenced by many factors, showing randomness and uncertainty. For example, the meteorological system in weather forecast is a typical chaotic system, and it is difficult for even the most advanced computer to accurately predict the future weather.

For human beings, it is of great significance to master and apply regularity. First of all, regularity can help people better know and understand natural and social phenomena and deepen their knowledge and understanding. Secondly, regularity can help people to better predict and control the future and reduce uncertainty and risk.

For example, by studying the regularity in astronomy and meteorology, people can predict natural phenomena such as solar eclipse, lunar eclipse, typhoon and earthquake, and take corresponding measures to avoid or reduce disaster losses. In addition, regularity can help people design and create new things better and improve productivity and efficiency.

For example, by studying the laws in physics and chemistry, people can invent new materials, new energy sources and new technologies to promote social progress and development.

In a word, understanding and applying regularity is one of the important prerequisites for the progress and development of human society. In the face of complex and changeable natural and social phenomena, people need to constantly explore and study the regularity and constantly improve their cognitive and practical abilities in order to better cope with various challenges and opportunities.