Proximal gradient method: Difference between revisions

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== Notations and terminology ==

Let <math>\mathbb{R}^N</math>, the <math>N</math>-dimensional [[euclideanEuclidean space]], be the ___domain of the function

<math> f: \mathbb{R}^N \rightarrow (-\infty,+\infty]</math>. Suppose <math>C</math> is a non-empty

convex subset of <math>\mathbb{R}^N</math>. Then, the indicator function of <math>C</math> is defined as