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The concept of group in mathematics "Group Theory": Who can explain it in common language: 1, what is a group? 2. What's the use?
A set of elements with reversible operations, together with operations, is called a group. Group theory is a kind of number theory, and its derivative disciplines include topology, which can be used to analyze abstract graphics, combination of numbers and shapes, multidimensional matrices and so on. The classic case is the story that Galois analyzed algebraic equations five times or more without a formula solution.