Sports integrate politics, economy, education, technology, and management. It has become an inseparable part of society and the individual. Sports represent the development level of a country and a nation. Especially today's competitive sports is a fierce sports competition and a technological battle. The development of sports research has penetrated mathematics [1]. As the basis of natural science and social science, mathematics is also infiltrating into various areas of sports science research at an increasingly rapid speed. The mathematical application of Chinese sports science has gradually stepped out of the “primary stage” dominated by on-site statistics and fuzzy mathematical methods. In turn, the field has grown to the point where it is based on principles such as kinetics and physiology. Scholars began to use modern mathematical methods such as calculus equations, operations research, numerical analysis, and modern scientific methods and synergy to explore the inner relationship of sports. We can reveal the essential characteristics and changing laws of sports by establishing and studying mathematical models of objective objects.

The history of solving algebraic equations in one variable can be traced back to the Babylonian era around 2000 AD. Many great mathematicians have made outstanding contributions to this [2]. Among them are many important figures: Khwarizmi, Cardano, Ferrari, Lagrange, Abel, Galois, etc. Among the many mathematicians, Lagrange of France is a more prominent one. He made a transformative contribution to the solution of algebraic equations. The resolution of algebraic equations has changed dramatically since then. And thus promote the new life of algebra.

Lagrange summed up the various methods of solving algebraic equations and put forward his views. The main contributions of Lagrangian to the solution of algebraic equations are as follows: 1) First, the theory of auxiliary equations is proposed. We need to solve a first-order auxiliary equation in advance when solving quadratic equations. Solving a cubic equation requires pre-solving a quadratic auxiliary equation. Solving a quartic equation requires pre-solving an additional cubic equation [3]. The solution of the differential equation for solving the quadratic equation is a function of the roots of the original quadratic equation. And we can only take one value under the permutation of its source. The solution of the auxiliary equation for solving the cubic equation is a function of the origins of the original cubic equation. And we can only take two values under the permutation of its source. The solution of the auxiliary equation for solving the quartic equation is a function of the origins of the original quartic equation. And we can only take three values under the permutation of its head. Therefore, the most critical step in solving the equation is solving the original equation's auxiliary equation. Then when solving the quintic equation, if an additional quartic equation can be solved in advance, the original quintic equation may be solved. If you can pre-solve an auxiliary equation of degree n-1, the actual equation may be solved. 2) Lagrange proposed to use the idea of permutation to solve algebraic equations and put forward the concept of pre-solved formula. Solving an algebraic equation is asking to solve its auxiliary equation. So we need to find a pre-solution [4]. The number of different values obtained by the pre-solved formula under the original equation roots is the degree of the auxiliary equation. If we can find a suitable pre-solution, we have the additional equation. Here we solve the auxiliary equation to get the original equation's solution smoothly. This paper briefly introduces the theory and method of the Lagrangian mathematical model in sports research according to the current mathematical application of sports science at home and abroad.

For the general equation, we can solve it according to the following procedure:

Solve Equation ^{n}_{l}^{n−1} + _{l}^{n−2} + … + _{n−l}_{n} = 0

The first step is to select a suitable pre-solution formula

The second step _{1}, _{2}, ⋯, _{n−1} when _{n}^{n}^{−1} + _{1} ^{n}^{−2} + _{2}^{n}^{−3} +⋯+ _{n−2}_{n−1} = 0 of the original equation [5]. Where _{i}

The third step solves _{1}, _{2},⋯, _{n−1} and then obtains _{1}, _{2},⋯, _{n−1}.

Step 4 Simultaneous Equations

Solving this system of equations yields the root _{1}, _{2}, _{3},⋯, _{n}

The above program has no problem-solving low-order (second, third, and fourth) equations, but it is not easy to find u and

Where _{1}, _{2}, _{3} is less than the degree n of the equation. So we get more auxiliary equations. If all these additional equations are solvable, the original equation must be solvable [7]. This process can be simply expressed as

If the above conclusions are accurate, we will get a subgroup sequence: _{1} ⊂ _{2} ⊂ _{3} ⊂ ⋯ ⊂ _{n}

Lagrange's use of the idea of permutation to solve algebraic equations is a significant turning point in the history of algebraic equation solving. It opens up a new era of algebraic equation solving. He revolutionized people's thinking, turning mathematicians from simply looking for algebraic tricks to solve equations to looking for a general method. Lagrange uses the idea of permutation to solve equations [8]. Lagrange derived a series of crucial algebraic knowledge. For example, the understanding of the concept of field and the prototype of the permutation group was used correctly by later mathematicians such as Ruffini, Gauss, Abel, Galois, etc. In this way, the problem of solving algebraic equations is finally solved and promotes the development of algebra itself. So Lagrange's work had a considerable impact on later algebraists.

Ruffini proved that the general equation does not have the so-called Lagrangian resolution to satisfy an auxiliary equation of degree lower than fifth. This means that the use of Lagrangian pre-solvers does not reduce the degree of higher-order equations. Ruffini examines the rational functions of the roots of general quadratic equations [9]. If p is the number of the process that remains unchanged under the replacement of the original equation roots, of course, p must be a factor of

Lagrange points the way to the solution of algebraic equations. He thought that the idea of permutation should be followed, but Ruffini declared that there is no radical solution to the general quintic equation. But that doesn't mean Lagrange's theory is wrong. For example, the bisector equation of the form ^{n}

Gaussian studies the problem from the root of the modulo p. Any prime number _{1}, _{2}, _{3}, _{4}, _{5}, _{6}, _{7} be the root of the septate equation| ^{7} −1 = 0. We can quickly get _{1}=^{31−1} =_{2}=^{32−1} =^{3}, _{3}=^{33−1} =^{9} =^{2}, _{4}=^{34−1} =^{27} = ^{6}, _{5}=^{35−1} =^{81} = ^{4}, _{6} = ^{36−1} =^{243} = ^{5}, _{7}=^{37−1} =^{727} = _{i}^{gi−1}.

The group ^{2},^{3},^{4},^{5}} can be found, and the group ^{7} −1 = (^{6} + ^{5} + ^{4} + ^{3} + ^{2} + ^{7} −1 = 0 is solving the equation ^{6} + ^{5} + ^{4} + ^{3} + ^{2} + _{1}, it can only take two values under all permutations of:

Where _{1} + _{3} + _{5} under all transformations of

Here we need to set its root as _{1}, _{2} to get the quadratic auxiliary equation about

From this we can obtain the quadratic auxiliary equation for ^{2} + _{1}, _{2}.

Where _{1} can only take three values under all permutations of

Here we need to set its root as _{1}, _{2}, _{3} to get the cubic auxiliary equation about

At this point we get the cubic auxiliary equation ^{3} −_{1}^{2} + _{2}

Of course, we can also use the second option. It's just that you need to solve a cubic equation first and then a quadratic equation. Its method is

Finally, the roots of the original secret equation can also be found.

The solution process of Gauss's famous 17th-degree circle equation is roughly similar to the above. We can simply express it as

Here ^{16} + ^{15} +⋯+ ^{3} + ^{2} + ^{1} + ^{n}_{1} × _{2} ×⋯× _{m}

Gauss is very clear about the connotation of the theory of Lagrangian algebraic equations, including that the pre-solved formula should be selected and the degree of the equation should be reduced. His procedure for solving the circle equation is an implementation of the Lagrangian method. Lagrange's theory of solving algebraic equations is validated here by Gauss. Therefore, without Lagrange's algebraic equation solving theoretical Gaussian, it is impossible to obtain the success of solving the 17th-degree centroid equation.

The most significant victory of the Lagrangian algebraic equation solving theory directly led to the emergence of the Galois theory. Its influence on Galois was enormous. The first is spiritual motivation [11]. Lagrange's solving algebraic equations stimulated Galois's idea to the greatest extent. Lagrange's study of the solution of equations of the fifth degree and above led Galois to be the first to realize that the different representations of numerical values must be taken into account when studying particular equations. So permutation doesn't change the value of numbers, only their indication.

Second, many algebraists say that Galois changed the face of solving algebraic equations. This has led to pure algebra in mathematics since him. Lagrange divided algebra into two parts: mathematics and pure algebra. Galois continued Lagrange's work. He further developed algebra based on Lagrange.

Finally, Lagrange gave Galois great help in solving the algebraic equations. Some of the fundamental theories of Lagrange still appear in Galois's view. Some of Galois's ideas have emerged in Lagrange's work. Such as presolution. Lagrange requires three conditions when discussing the pre-solution formula selection: 1) The pre-solution procedure should be a rational expression of the original equation roots and known numbers. 2) Related numbers and known numbers can rationally express each root of the equation. 3) must be the root of a solvable equation. 1) is the criterion for describing the choice of presolution formula. 2) and 3) describe the properties that the pre-solution should satisfy. It is undeniable that Lagrange did select the pre-solution recipe and solve the algebraic equation according to the above three points. This may be one of the reasons why he didn't get the final victory. Galois realized that choosing the pre-solved formula is enough to satisfy 1) and 2) for an equation. And there is no pre-solution formula that needs to satisfy the three conditions simultaneously. Therefore, Galois referred to Lagrange's research theory on the problem of pre-solution selection.

In addition, it was said in the previous article that Lagrange pointed out the direction for solving algebraic equations, but he did not point out specific measures. That is to say, according to Lagrange's idea, it should be possible to find the root of the equation, and Galois did it. Under the guidance of Lagrange, he found this specific path to the end. According to the idea of solving Lagrange's theoretical algebraic equations, a subgroup sequence is finally obtained [12]. The core of Galois's theory is to find such a subgroup sequence. In any respect, Lagrangian has the most significant influence on Galois. Lagrange established the framework of the idea, and it is within this framework Galois won the victory of solving algebraic equations.

The sports mathematical model originates from the original but is higher than the sports prototype. It is an abstraction and simplification of a discernible sports archetype. The purpose of establishing a sports mathematical model is to carry out sports scientific research better and then solve practical problems. So we have to complete the calculation of the mathematical model. However, these tasks are usually incompetent with humans and must be done with the help of computers. The application of computers makes the research of sports mathematical models have a particular foundation. But the direct “addition” of mathematical models and computers does not always meet practical needs. The size of the system, the amount of data, and the time constraints require us to have suitable computing methods. It is this that drives the development of mathematics and sports science. It promotes the modernization of sports science. Mathematical models set up a new bridge for further integrating disciplines such as sports science and computer science.

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equation Research on the construction of early warning model of customer churn on e-commerce platform Study on inefficient land use determination method for cities and towns from a city examination perspective A sentiment analysis method based on bidirectional long short-term memory networks Evaluation of ecosystem health in Futian mangrove wetland based on the PSR-AHP model A study of local smoothness-informed convolutional neural network models for image inpainting Towards more efficient control of the ironmaking blast furnace: modelling gaseous reduction of iron ores in H _{2}-N_{2}atmosphereAlgorithm of overfitting avoidance in CNN based on maximum pooled and weight decay Mathematical Calculus Modeling in Improving the Teaching Performance of Shot Put Application of Nonlinear Differential Equation in Electric Automation Control System Higher Mathematics Teaching Curriculum Model Based on Lagrangian Mathematical Model Decisions of competing supply chain with altruistic retailer 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Model Higher Education Agglomeration Promoting Innovation and Entrepreneurship Based on Spatial Dubin Model Chinese-English Contrastive Translation System Based on Lagrangian Search Mathematical Algorithm Model