Rosenbrock function

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What Wikipedia says

In mathematical optimization, the Rosenbrock function is a non-convex function, introduced by Howard H. Rosenbrock in 1960, which is used as a performance test problem for optimization algorithms. It is also known as Rosenbrock's valley or Rosenbrock's banana function.

Excerpt from the Wikipedia article “Rosenbrock function”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Morn the Gorn, Public domain, via Wikimedia Commons.