5. Appendix B: differential operators

The various sections of this paragraph are devoted to :

• definition of differential operators ;

• applying differential operators to products or functions;

• combinations of differential operators ;

• integration of differential operators.

For simplicity's sake, we've focused on giving results (highlighting tricky points) rather than demonstrating them; similarly, we've only considered the case where space is related to a right-axis trirectangular trihedron .