@techreport{GriewankStreubelTischendorf2020, author = {Andreas Griewank and Tom Streubel and Caren Tischendorf}, title = {On the abs-polynomial expansion of piecewise smooth functions}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {20-14}, language = {eng}, year = {2020} }