Exercise 2.7.9

Answers

Since those $U_{i}$ are pairwise commutative, we may just assume that $i = n$ . Hence if $U_{n} (x) = 0$ for some $x \in V$ , then

U_{1} U_{2} \dots U_{n} (x) = U_{1} U_{2} \dots U_{n - 1} (0) = 0 .

jephianlin

2011-06-27 00:00