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math.HO2021
A short noncomplex proof for the solution set of homogeneous second order linear differential equations with constant coefficients
Patrik Lundström
We provide a short proof, not utilizing complex numbers, for the solution set of homogeneous second order linear differential equations with constant coefficients.
math.CA2021
Double Calculus
Patrik Lundström
We present a streamlined, slightly modified version, in the two-variable situation, of a beautiful, but not so well known, theory by Bögel, already from the 1930s, on an alternativ…