|Method: a method is a procedure agreed on by participants of a discussion or research project. In the case of violations of a method, the comparability of the results is in particular questioned, since these no longer come from a set with uniformly defined properties of the elements.|
Books on Amazon
Method/Science/Law/Differential Equation/Feynman: Why are linear systems so important?
1) Because we can solve them!
2) The basic laws of physics are often linear. (Also in quantum mechanics).
Vom Wesen physikalischer Gesetze München 1993
Vorlesungen über Physik I München 2001