11 // 3D body using matrix-free application of a mass + diff operator.  Arbitrary
138     // QFunction that builds the quadrature data for the mass + diff operator  in example_3_vector()
149                     // Diff  in example_3_vector()
162                     // Diff  in example_3_vector()
190                     // Diff  in example_3_vector()
231     // Operator that build the quadrature data for the mass + diff operator  in example_3_vector()
245     // Compute the quadrature data for the mass + diff operator  in example_3_vector()
251     // QFunction that applies the mass + diff operator  in example_3_vector()
263                         // Diff  in example_3_vector()
278                         // Diff  in example_3_vector()
298                         // Diff  in example_3_vector()
328     // Mass + diff Operator  in example_3_vector()
331         .name("mass diff")?  in example_3_vector()
352     // Apply the mass + diff operator  in example_3_vector()