Maximizing xy: Understanding Optimization Problems in Mathematics

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So, in summary, the AM-GM inequality can be used to find the maximum value of a product in an optimization problem, where 1 is the least upper bound and is achieved when all data are the same.
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Mr Davis 97
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I am little confused when it comes to optimization problems. For example, say we are given that ##x+y=2##, and are asked to maximize ##xy##. By AM-GM, we have that ##xy \le 1##. But why should this indicate that ##1## is the maximum value? Isn't it an equally true statement to claim that ##xy \le 2##, since the former interval is contained in the latter?
 
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It is equally true, but not as useful. 2 is merely an upper bound, whereas 1 is a least upper bound. In fact it is a maximum, that is achieved when ##x=y##. Arithmetic and Geometric Means are identical when all data are the same.
 
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andrewkirk said:
It is equally true, but not as useful. 2 is merely an upper bound, whereas 1 is a least upper bound. In fact it is a maximum, that is achieved when ##x=y##. Arithmetic and Geometric Means are identical when all data are the same.
I think it was the distinction between upper bound and least upper bound that I was looking for.
 

FAQ: Maximizing xy: Understanding Optimization Problems in Mathematics

1. What are optimization problems?

Optimization problems are mathematical problems that involve finding the best possible solution for a given objective, while satisfying a set of constraints. These problems are commonly used in various fields such as engineering, economics, and computer science to optimize the performance of systems or processes.

2. What types of optimization problems exist?

There are several types of optimization problems, including linear programming, nonlinear programming, integer programming, dynamic programming, and stochastic programming. Each type has its own set of techniques and algorithms for solving it, depending on the specific problem at hand.

3. How are optimization problems solved?

Optimization problems are typically solved using mathematical techniques such as gradient descent, simplex method, branch and bound, or genetic algorithms. These techniques involve finding the optimal solution by iteratively adjusting the variables in the problem until the best solution is reached.

4. What are the applications of optimization problems?

Optimization problems have a wide range of applications in real-world scenarios. They are used to optimize supply chains, production processes, transportation routes, resource allocation, financial portfolios, and many other systems. They are also used in machine learning and artificial intelligence to improve the performance of algorithms.

5. Are there any challenges in solving optimization problems?

Yes, there are several challenges in solving optimization problems. These include dealing with complex and high-dimensional problems, finding efficient and accurate algorithms, and handling uncertainty and variability in real-world scenarios. Additionally, it can be difficult to determine the optimal solution when multiple solutions have similar performance.

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