%0 Journal Article
%T Normal extensions of a singular multipoint differential operator of first order
%A Zameddin I. Ismailov
%A Rukiye Ozturk Mert
%J Electronic Journal of Differential Equations
%D 2012
%I Texas State University
%X In this work, we describe all normal extensions of the minimal operator generated by linear singular multipoint formally normal differential expression $l=(l_1,l_2,l_3)$, $l_k=frac{d}{dt}+A_k$ with selfadjoint operator coefficients $A_k$ in a Hilbert space. This is done as a direct sum of Hilbert spaces of vector-functions $$ L_2(H,(-infty ,a_1))oplus L_2(H,(a_2,b_2)) oplus L_2(H,(a_3,+infty)) $$ where $-infty
%K Multipoint differential operators
%K selfadjoint and normal extension
%K spectrum
%U http://ejde.math.txstate.edu/Volumes/2012/36/abstr.html