What is the difference between an unbounded solution and infinite optimal solutions?

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I am currently studying Linear Programming, and one of the few things that I haven't found a solution for (pun obviously intended) is the difference between a solution being either unbounded or having infinite optimal solutions.

My thinking is, if something is unbounded, is that not the same as it being infinite? I must not have a proper understanding of both, as I cannot see why my thinking would correct.

If possible, could someone illustrate the differences with a graph?

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1 Answer

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Unbounded Solution refers to one solution being unbounded, in the sense that the $y = x$ is unbounded.

Infinite Optimal Solutions refers to an infinite family of functions that are all optimal solutions, in the sense that $x = \pi + 2n\pi$ is an infinity family of solutions to the problem $\min\cos(x)$.

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