The University of Illinois at Chicago's Neighborhoods Initiative is used as a case study of how planning occurs in a situation of shared power; what the relationship is between the goals of participants and what actually gets done; and what the role of planners is in linking knowledge to action. The collaborative planning model is characterized by incrementalism, and relationship building is a key element. Relationship building and goal achievement are not opposites; the achievement of goals requires some level of trust in a partnership. The relative emphasis on one or the other depends on the specific context in which planning is done. The implications for planners and planning education are a greater emphasis on political and communicative skills in order to be effective in collaborative planning.
The 0(4) symmetry of the nonrelativistic hydrogen atom is exploited in conjunction with Green's-function methods as a tool for the solution of Coulomb problems. The Bethe logarithm, the principal contribution to the Lamb shift, is treated by this means, and a rapidly convergent series is obtained. This is used to evaluate the Bethe logarithm of the 15, 25, and IP states, and a discrepancy with the most precise previously published value for the 15 state is indicated. The new value is 2.9841285 with an estimated uncertainty of ±3 in the last figure. The discrepancy is beyond the reach of experimental observation at present.
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