How to optimize the outer pipe diameter?

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Gama Ali
Gama Ali el 26 de Oct. de 2015
Respondida: Walter Roberson el 26 de Oct. de 2015
Suppose that I have a big pipe and I want to put n small pipes in it, say 10 pipes 1 inch radius each. What is the smallest radius for the biggest pipe to contain all of them? Constraint minimization, they must not be inside one another. If we write a matlab function, how will I write the function to minimize the radius for the outer pipe?

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Walter Roberson
Walter Roberson el 26 de Oct. de 2015
https://en.wikipedia.org/wiki/Circle_packing_in_a_circle
3.813... approximately is the required radius.
The shape is not obvious, even when you look at a diagram of it. You will need to find the 1969 proof (or a translation of it.)

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