The essential norm of a composition operator on Orlicz spaces
Order-isomorphism and a projection's diagram of C(X)
Transversal lightlike submanifolds of indefinite sasakian manifolds
Pseudo simplicial groups and crossed modules
Generalized catalan numbers, sequences and polynomials
Songül ESİN, İsmail GÜLOĞLU, Cemal KOÇ
Complete systems of differential invariants of vector fields in a euclidean space
A short survey on mathematical work of Cemal Koç
Number of pseudo--Anosov elements in the mapping class group of a four--holed sphere
Number of pseudo–Anosov elements in the mapping class group of a four–holed sphere