[51]
page 319, line -8:  permition -> permission
page 321, line 14:  idenpotent -> idempotent.

[79]
page 150, line 9: I. N Herstein -> I.N. Herstein
page 152, line 8: east -> least.
page 153,  line 7: traingular -> triangular.
page 155, line 5: in as -> in [22] as.
page 155, line 2 from botton: uniqely -> uniquely.
page 160, reference 3: use Roman for the title of article.

[93]
page 654,
see my letter to Keller, 1/9/91.

[95]
page 223, Lemma (1.1): \cup -> \cap
page 225, line 7:  [E₂A, L(H)]         ->     E₂(A. L(H))
page 226, line 11: [11] -> [13].
page 22 Lemma (3.2):  . Then ->  \in K. Then

[97]
page 219,  line -20  A -> H
page 221 line-12  \sum -> \sum_{y=1}^{n-1}
page 222  line 7 first k,j -> j, k
page 222  line -14  (9) -> (11).

[108]
page 446, line 14:  5 -> 3.
page 454, line 19:  solution -> solutions.