Text this: The <img src="/fulltext-image.asp?format=htmlnonpaginated&src=W602054689734576_html\10255_2006_Article_346_TeX2GIFIEq1.gif" border="0" alt="$$ {\user1{\mathcal{U}\mathcal{V}}} $$" />-Decomposition on a Class of D.C. Functions and Optimality Conditions