International Journal of Mathematics and Mathematical Sciences
Volume 2006 (2006), Issue 3, Pages 72589, 12 p.
doi:10.1155/IJMMS/2006/72589
Universal mapping properties of some pseudovaluation domains and related quasilocal domains
Ahmed Ayache1
, David E. Dobbs2
and Othman Echi3
1Department of Mathematics, Faculty of Sciences, University of Bahrain, P.O. Box 32038, Isa Town, Bahrain
2Department of Mathematics, University of Tennessee, Knoxville, TN 37996-1300, USA
3Department of Mathematics, Faculty of Sciences of Tunis, University Tunis-El Manar, Campus Universitaire, Tunis 2092, Tunisia
Abstract
If (R,M) and (S,N) are quasilocal (commutative integral) domains and f:R→S is a (unital) ring homomorphism, then f is said to be a strong local homomorphism (resp., radical local homomorphism) if f(M)=N (resp., f(M)⊆N and for each x∈N, there exists a positive integer t such that xt∈f(M)). It is known that if f:R→S is a strong local homomorphism where R is a pseudovaluation domain that is not a field and S is a valuation domain that is not a field, then f factors via a unique strong local homomorphism through the inclusion map iR from R to its canonically associated valuation overring (M:M). Analogues of this result are obtained which delete the conditions that R and S are not fields, thus obtaining new characterizations of when iR is integral or radicial. Further analogues are obtained in which the “pseudovaluation domain that is not a field” condition is replaced by the APVDs of Badawi-Houston and the “strong local homomorphism” conditions are replaced by “radical local homomorphism.”