Ontology type: schema:ScholarlyArticle Open Access: True
2015-10
AUTHORSFriedrich Littmann, Mark Spanier
ABSTRACTFor a Hermite–Biehler function E of mean type τ, we determine the optimal (with respect to the de Branges measure of E) majorant ME+ and minorant ME- of exponential type τ for the truncation of x↦(x2+a2)-1. We prove that ∫RME+(x)-ME-(x)|E(x)|-2dx=1a2K(0,0),where K is the reproducing kernel for the de Branges space H(E). As an application, we determine the optimal majorant and minorant for the Heaviside function that vanish at a fixed point α=ia on the imaginary axis. We show that the difference of majorant and minorant has integral value (πa-tanh(πa))-1πa. More... »
PAGES209-229
http://scigraph.springernature.com/pub.10.1007/s00365-015-9304-4
DOIhttp://dx.doi.org/10.1007/s00365-015-9304-4
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