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International Journal of Mathematics and Mathematical Sciences
Volume 2006, Article ID 47146, 16 pages

Irreducible morphisms, the Gabriel-valued quiver and colocalizations for coalgebras

Faculty of Mathematics and Computer Science, Nicolaus Copernicus University, ul. Chopina 12/18, Toruń 87-100, Poland

Received 22 December 2005; Revised 7 May 2006; Accepted 9 May 2006

Copyright © 2006 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Given a basic K-coalgebra C, we study the left Gabriel-valued quiver (QC,dC) of C by means of irreducible morphisms between indecomposable injective left C-comodules and by means of the powers radm of the radical rad of the category C-inj of the socle-finite injective left C-comodules. Connections between the valued quiver (QC,dC) of C and the valued quiver (QC¯,dC¯) of a colocalization coalgebra quotient fE:CC¯ of C are established.