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A definition of asymptotic convergence is given for nonrelativistic time-dependent scattering problems involving Coulomb potentials. Convergence proofs have been found both for potential and for n-body multichannel scattering. For pure Coulomb potential scattering, the Mo/ller wave matrix is computed explicitly and found to have its usual meaning.

This study demonstrates A-PRF alone or augmented with FDBA is a suitable biomaterial for ridge preservation. This study represents the first randomized controlled clinical trial comparing A-PRF with and without FDBA to FDBA alone for ridge preservation.

frustration always leads to some form of aggression" to "frustration produces instigations to a number of different types of response, one of which is an instigation to some form of aggression."One of the more recent and interesting hypotheses concerning frustration and aggression is that presented by Sargent (Paper No. 29), who also criticized the frustration-aggression hypothesis. Sargent believes that frustration involves a sequence of behavior in which there are four important aspects: a) frustration, b) emotion, c) habit or mechanism, and d) overt behavior. Furthermore, he holds that each of these stages is always influenced by two important factors, the person's past experiences and his interpretation of the present situation. Frustration-Aggression/ ""PHE frustration-aggres- X sion hypothesis is anHypothesis Neal E. Miller (with the collaboration of Robert R. Sears, O. H. Mowrer, Leonard W. Doob and John Dollard)attempt to state a relationship believed to be important in many different fields of research. It is intended to suggest to the student of human nature that when he sees aggression he should turn a suspicious eye on possibilities that the organism or group is confronted with frustration; and that when he views interference with individual or group habits, he should be on the look-out for, among other things, aggression. This hypothesis is induced from commonsense observation, from clinical case histories, from a few experimental investigations, from sociological studies and from the results of anthropological field work. The systematic formulation of this hypothesis enables one to call sharp attention to certain common characteristics in a number of observations from Abridged from the Psychological Review, 1941, 48, 337-342. Reprinted by permission of the authors and the American Psychological Association, Inc.