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#ZVONIMIR #GRIBL
allgraph.ro/advanced-sea...
#FRIEDRICH #WILHELM #BESSEL
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#RUDOLF #FISCHER #PUPPENSPIELER
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Inverse square singularities and eigenparameter-dependent boundary conditions are two sides of the same coin Abstract. We show that inverse square singularities can be treated as boundary conditions containing rational Herglotz–Nevanlinna functions of the eigenval

“Inverse square singularities and eigenparameter dependent boundary conditions are two sides of the same coin” can be freely accessed at
academic.oup.com/qjmath/artic...

#spectraltheory #inverseproblems #Bessel #Darboux #Schrödinger #supersymmetry

Heya, Bessel! Where ya been hiding? 😂
#sleeptoken #vessel #bessel

Measuring stellar distances begins with #parallax. #November 1838, Friedrich Wilhelm #Bessel published 1st #distance 10.3 ly to 61 Cygni (modern value 11.4 ly) 🔭🧪

more about 1st stellar parallax
aas.org/posts/news/2...

#star #histsci #EduSky #STEMed