Proximal gradient method: Difference between revisions

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minor change, reformatting of a sum so \sum is used
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convex subset of <math>\mathbb{R}^N</math>. Then, the indicator function of <math>C</math> is defined as
 
: <math> i_C\iota_C : x \mapsto
\begin{cases}
0 & \text{if } x \in C \\