sum of ℓ<sub>∞</sub>-norms (see [<a href="doc_spams010.html#mairal10">22</a>, <a href="doc_spams010.html#mairal13">23</a>]);
</li><li class="li-itemize">mixed ℓ<sub>1</sub>/ℓ<sub>2</sub>-norms on matrices [<a href="doc_spams010.html#yuan">38</a>, <a href="doc_spams010.html#obozinski">29</a>];
</li><li class="li-itemize">mixed ℓ<sub>1</sub>/ℓ<sub>∞</sub>-norms on matrices [<a href="doc_spams010.html#yuan">38</a>, <a href="doc_spams010.html#obozinski">29</a>];
</li><li class="li-itemize">mixe