we find a criterion for a morphism of coalgebras over a barr-exact category to be effective descent and determine (effective) descent morphisms for coalgebras over toposes in some cases. also, we study some exactness properties of endofunctors of arbitrary categories in connection with natural transformations between them as well as those of functors that these transformations induce between co...

Background: The glutathione S-transferase (GST) family of metabolising enzymes plays an important role in the detoxification of mutagens and carcinogens. The expression of many of these cancer susceptibility enzymes is genetically polymorphic. An increased frequency of GST-null genotypes has been associated with several malignancies. Objective: To investigate the rate of GSTT1 and GSTM1 null ge...

I prove forcing preservation theorems for products of definable partial orders preserving cofinality of the meager or null ideal. Rectangular Ramsey theorems for the related ideals follow from the proofs.

We study exponentiability of homomorphisms in varieties of universal algebras close to classical ones. After describing an “almost folklore” general result, we present a purely algebraic proof of “étale implies exponentiable”, alternative to the topologically motivated proof given in one of our previous papers, in a different context. We prove that only isomorphisms are exponentiable homomorphi...

traditional work on pro-drop languages identified a set of parametric values ‎associated with the availability of null subjects, including the presence of null ‎expletive subjects. in the same vein, but more within the framework of minimalist ‎program, i will discuss while referential subjects may optionally be overt or covert ‎in the persian, expletives are obligatorily null. in this regard, a...

In a recent paper with L. Q. Zamboni the authors introduced the class of θ-episturmian words, where θ is an involutory antimorphism of the free monoid A∗. In this paper, we introduce and study θcharacteristic morphisms, that is, morphisms which map standard episturmian words into standard θ-episturmian words. They are a natural extension of standard episturmian morphisms. The main result of the...

For a strongly inacessible cardinal $\kappa$, we investigate the relationships between following ideals: - ideal of meager sets in ${<}\kappa$-box product topology "null" sense [Sh:1004] (arXiv:1202.5799) nowhere stationary subsets (naturally defined) set $S_{\rm pr}^\kappa \subseteq \kappa$. In particular, analyse provable inequalities characteristics for these ideals, and give consistency res...