The Logarithmic Potential
We have seen in Chapter VI, § 7 (p. 172), that logarithmic potentials are limiting forms of Newtonian potentials. We have seen also that harmonic functions in two dimensions, being special cases of harmonic functions in Space, in that they are independent of one coördinate, partake of the properties of harmonic functions in space. The only essential differences arise from a change in the definition of regu- larity at infinity, and the character of these differences has been amply illustrated in the exercises at the close of Chapter IX (p. 248)
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