85 citations · 158 across the 28 of their papers we have counts for
Showing 2009 · math.CAShow all
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math.CA2009
The first return map for planar vector fields with nilpotent linear part with a center or a focus
Rodica D. Costin
The return map for planar vector fields with nilpotent linear part (having a center or a focus and under an assumption generically satisfied) is found as a convergent power series…
math.CA2009
The return map for a planar vector field with nilpotent linear part: a direct and explicit derivation
Rodica D. Costin
Using a direct approach the return map near a focus of a planar vector field with nilpotent linear part is found as a convergent power series which is a perturbation of the identit…
math.CA2009
Orthogonality of Jacobi and Laguerre polynomials for general parameters via the Hadamard finite part
Rodica D. Costin
Orthogonality of the Jacobi and of Laguerre polynomials, P_n^(a,b) and L_n^(a), is established for a,b complex (a,b not negative integers and a+b different from -2,-3,...) using th…