Selected Papers

1 Zeros and Critical Points of Polynomials and Rational Functions.- [18*] On the location of the roots of the Jacobian of two binary forms and of the derivative of a rational function.- [21-a*] On the location of the roots of the derivative of a polynomial.- [21-b*] On the location of the roots of the Jacobian of two binary forms and of the derivative of a rational function.- [20-c*] On the location of the roots of the derivative of a polynomial.- [33-1*] Note on the location of the roots of the derivative of a polynomial.- [22-g*] On the location of the roots of certain types of polynomials.- [64-e*] A Theorem of Grace on the zeros of polynomials, revisited.- [64-j*] The location of the zeros of the derivative of a rational function, revisited.- [24-h*] An inequality for the roots of an algebraic equation.- Commentary.- 2 Walsh Functions.- [23-b*] A closed set of normal orthogonal functions.- Commentary.- 3 Qualitative Approximation.- [26-b*] Über die Entwicklung einer analytischen Funktion nach Polynomen.- [26-c*] Über die Entwicklung einer Funktion einer komiexen Veränderlichen nach Polynomen.- [28-a*] On the expansion of analytic functions in series of polynomials and in series of polynomials and in series of other analytic functions.- [28-d*] Über die Entwicklung einer harmonischen Funktion nach harmonischen Polynomen.- [29-b*] The approximation of harmonic functions by harmonic polynomials and by harmonic rational functions.- Commentary.- 4 Conformai Mapping.- [37-d*] On the shape of level curves of Green’s function.- [38-a*] Note on the curvature of orthogonal trajectories of level curves of Green’s functions.- [39-d*] On the circles of curvature of the images of circles under a conformal map.- [40-a*] Note on the curvature of the orthogonal trajectories of level curves of Green’s functions.- [70-a*] On the shape of the level loci of harmonic measure.- [55-a*] (With D. Gaier) Zur Methode der variablen Gebiete bei der Randverserrung.- [56-b*] (With L. Rosenfeld) On the boundary behavior of a conformal map.- [56-d*] On the conformal mapping of multiply connected regions.- Commentary Dieter Gaier.- 5 Polynomial Approximation.- [32-c*] On polynomial interpolation to analytic functions with singularities.- [37-g*] (With W.E. Sewell) Note on the relation between continuity and degree of polynomial approximation in the complex domain.- [38-d*] (With W.E. Sewell) Note on degree of trigonometric and polynomial approximation to an analytic function.- [53-c*] (With T.S. Motzkin) On the derivative of a polynomial and Chebyshev approximation.- [73-a*] (With T.S. Motzkin) Equilibrium of inverse-distance forces in three-dimensions.- [34-c*] Note on the orthogonality of Tchebycheff polynomials on confocal ellipses.- [42-a*] Note on the coefficients of overconvergent power series.- [51-c*] Note on approximation by bounded analytic functions.- [68-e*] Approximation by bounded analytic functions: Uniform convergence as implied by mean convergence.- [73-c*] History of the Riemann mapping theorem.- Commentary.- 6 Rational Approximation 465.- [31-c*] On the overconvergence of certain sequences of rational functions of best approximation.- [34-b*] On approximation to an analytic function by rational functions of best approximation.- [40-b*] On the degree of convergence of sequences of rational functions.- [46-c*] Overconvergence, degree of convergence, and zeros of sequences of analytic functions.- [64-a*] Padé approximants as limits of rational functions of best approximation.- [65-i*] The convergence of sequences of rational functions of best approximation with some free poles.- [67-c*] An extension of the generalized Bernstein lemma.- [68-a*] Degree of approximation by rational functions and polynomials.- [71-b*] (With Dov Aharonov) Some examples in degree of approximation by rational functions.- Commentary.- 7 Spline Functions.- [65-b*] (With J.H. Ahlberg and E.N. Nilson) Fundamental properties of generalized splines.- [67-d*] (With J.H.Ahlberg and E.N. Nilson) Complex cubic splines.- [68-f*] (With J.H. Ahlberg and E.N. Nilson) Cubic splines on the real line.- Commentary by Walter Schempp.