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which is known as the [[Thresholding (image processing)|soft thresholding]] operator <math>S_{\gamma}(x)=\operatorname{prox}_{\gamma \|\cdot\|_1}(x)</math>.<ref name=combettes /><ref name=daubechies>{{cite journal|last=Daubechies|first=I. |author2=Defrise, M. |author3=De Mol, C.|title=An iterative thresholding algorithm for linear inverse problem with a sparsity constraint|journal=Comm. Pure Appl. Math|year=2004|volume=57|issue=11|pages=1413–1457|doi=10.1002/cpa.20042|arxiv=math/0307152}}</ref>
=== Fixed point iterative schemes ===
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