ABSTRACT
Such exponentiations are extrapolations. They are
Yi L based on the form s of the eigenvalues of R g . By
construction, R ^ R V = R ^ / . Of course, we have not s s ss ------------
constructed R to all orders in e , and therefore we car s _ 0
not observe s , but only 1 - ε In s. We are assuming
L that i f we constructed R g ex;actly, obtained the e igen-
E F F E C T O F O THER T ER M S 207
values, and then expanded in powers of ε , we would get,
Y2 to Ο (ε ), 1 - ε In s from s . We are making an approxi-
mation on the exponent. A small e rro r on y. would of
course produce a large e r ro r on s i f s is very large.
