In this paper we introduce the notion of “strong n-perfect rings” which is in some way a generalization of the notion of “n-perfect rings”. We are mainly concerned with those class of rings in the context of pullbacks. Also we exhibit a class of n-perfect rings that are not strong n-perfect rings. Finally, we establish the transfer of this notion to the direct product notions.

Six cultures of Microsporum amazonicum were recently isolated from the hair of six spiny rats (Proechimys guyannensis) trapped near the city of Belém, Brasil. When the six isolates were paired with each other in ali possible combinations on soil-hair plates, eight of 15 pairs developed fertile ascocarps. Based on the morphology of the gymnothecia, the perfect state was classified in the genus N...

The last decade has witnessed substantial interest in protocols for transferring information on networks of quantum mechanical objects. A variety of control methods and network topologies have been proposed, on the basis that transfer with perfect fidelity-i.e., deterministic and without information loss-is impossible through unmodulated spin chains with more than a few particles. Solving the o...

abū l-ḥasan alī ibn al-‘abbās al-majūsī ahvazi (? 930-994 ad), best known as haly abbas in the west, was a 10th century persian physician whose lifetime coincided with the flourishing of medical science in the near east, the islamic medicine golden age, an era extending from the 9th to the 12th centuries ad. haly abbas, in his extant book kāmil al-sinā‘ah al-tibbīyah (the perfect book of the ar...

We consider graphs with two cut vertices joined by a path one or edges, and prove that there can be no quantum perfect state transfer between these vertices, unless the graph has other vertex. achieve this result applying 1-sum lemma for characteristic polynomial of graphs, neutrino identities relate entries eigenprojectors eigenvalues, variational principles eigenvalues (Cauchy interlacing the...

Quantum 2-party cryptography differs from its classical counterpart in at least one important way: Given blak-box access to a perfect commitment scheme there exists a secure 1−2 quantum oblivious transfer. This reduction proposed by Crépeau and Kilian was proved secure against any receiver by Yao, in the case where perfect commitments are used. However, quantum commitments would normally be bas...

theoratical and practical return to islamic heritage is a developing instrument of the new thoughts and approaches in muslem intellectuals. of cours. the basis of this incredble heritage can be found in behavour of the inevrables particularly imam ali which has been demonstrated in nahjolballagheh: a proper conceptualization of alavi government. imam ali`s governmental experiences is a perfect ...