Under 5 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,240 6.2 5 to 9 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,271 6.3 10 to 14 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,317 6.5 15 to 19 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,329 6.6 20 to 24 years . . . . . . . . . . . . . . . . ....

In a paper by Burke, Lewis and Overton, a first order expansion has been given for the minimum singular value of A−zI, z ∈ C, about a nonderogatory eigenvalue λ of A ∈ Cn×n. This note investigates the relationship of the expansion with the Jordan canonical form of A. Furthermore, formulas for the condition number of eigenvalues are derived from the expansion.

Drs. Overton and Denno have condensed in this book a large amount of useful information for the benefit of local health officers in the United States. It is somewhat startling to note that in some of the United States the health officer need not be a qualified medical man, while the authors deprecate the fact that these appointments are sometimes given laiway as political rewards. It is not sur...