11 // 3D body using matrix-free application of a mass + diff operator.  Arbitrary
136     // QFunction that builds the quadrature data for the mass + diff operator  in example_3()
147                     // Diff  in example_3()
160                     // Diff  in example_3()
188                     // Diff  in example_3()
229     // Operator that build the quadrature data for the mass + diff operator  in example_3()
243     // Compute the quadrature data for the mass + diff operator  in example_3()
249     // QFunction that applies the mass + diff operator  in example_3()
260                     // Diff  in example_3()
269                     // Diff  in example_3()
285                     // Diff  in example_3()
315     // Mass + diff Operator  in example_3()
318         .name("mass diff")?  in example_3()
330     // Apply the mass + diff operator  in example_3()