ABSTRACT
Following the notations (3. 55) adopted in the preceding chapter, we can write:
lead to:
v v v v v v
In these expressions, one can substitute the solution of Le, obtained from (3. 51) and (3. 56) .
Insofar as the physical interpretation of these equations and their applications, one cannot conSider more than the following: 1 0 One can keep the rigorous solutions (3. 51) -(3. 56) and apply them to special simple cases. An example of this is the search for a spherically symmetric solution (see Chapter 5). 2 0 One can seek an approximate form of the relations (4. 5) and (4. 6) (see § B this chapter) .
