Very recently, Ma et al. (Fixed Point Theory Appl. 2014:206, 2014) introduced C∗-algebra-valued metric spaces as a new concept. Also, Ma and Jiang (Fixed Point Theory Appl. 2015:222, 2015), generalizing this concept, introduced C∗-algebra-valued b-metric spaces. In both frameworks, these and other authors proved some fixed point results. We show in this paper that all these results (as well as ...

Using a result from Herzog [2] we prove the following. Let (B0, n0) be an artinian local algebra of embedding dimension v over some field L with tangent cone gr(B0) ∼= L[X1, . . . , Xv]/I0. Suppose the ideal I0 is generated by power products of degree 2. Then for every residually rational flat local homomorphism (A,m) → (B, n) of local L-algebras that has a special fiber isomorphic to B0 the (v...

The work is devoted to the study of Fréchet algebras symmetric (invariant under composition every components its argument with any measure preserving bijection domain argument) analytic functions on Cartesian powers complex Banach spaces Lebesgue integrable in a power $p\in [1,+\infty)$ complex-valued segment $[0,1]$ and semi-axis. We show that algebra all entire bounded type $n$th space $L_p[0...

This paper studies nonlinear deformations of the linear gauge theory of any number of spin-2 and spin-3/2 fields with general formal multiplication rules in place of standard Grassmann rules for manipulating the fields, in four spacetime dimensions. General possibilities for multiplication rules and coupling constants are simultaneously accommodated by regarding the set of fields equivalently a...

some lie algebra analogues of schur's theorem and its converses are presented. as a result, it is shown that for a capable lie algebra l we always have dim l=z(l)  2(dim(l2))2. we also give give some examples sup- porting our results.

It is observed that a CL-algebra (Classical Linear Algebra) contains within it a number of MV-algebras (Many-valued Algebras). A necessary and sufficient condition is obtained when a CL-algebra as a whole reduces to an MV-algebra. All the embedded MValgebras are characterised. A special MV-algebra called the Stem of the CL-algebra is studied to some depth. © 1998 Elsevier Science Inc. All right...

The aim of this note is to demonstrate that Kaplansky–Hilbert lattices and injective Banach lattices may be produced from each other by means of the well known convexification procedure. This is done via the Boolean valued analysis approach. The subject gives a good opportunity to discuss also the relationship between the Kantorovich’s heuristic principle and the Boolean value transfer principl...

‎for any archimedean$f$-ring $a$ with unit in whichbreak$awedge‎‎(1-a)leq 0$ for all $ain a$‎, ‎the following are shown to be‎‎equivalent‎:‎‎1‎. ‎$a$ is isomorphic to the $l$-ring ${mathfrak z}l$ of all‎‎integer-valued continuous functions on some frame $l$‎. 2‎. ‎$a$ is a homomorphic image of the $l$-ring $c_{bbb z}(x)$‎‎of all integer-valued continuous functions‎, ‎in the usual sense‎,‎on som...

For a quasi-free module over a function algebra A(Ω), we define an analogue of the Berezin transform and relate this to the quotient of the C*-algebra it generates modulo the commutator ideal. Certainly the best understood commutative Banach algebras are those that consist of all the continuous complex-valued functions on a compact Hausdorff space. Indeed, most self-adjoint phenomena involving ...

in this paper, we extend the construction of a fuzzy subgroup generated by a fuzzy subset to $l$-setting. this construction is illustrated by an example. we also prove that for an $l$-subset of a group, the subgroup generated by its level subset is the level subset of the subgroup generated by that $l$-subset provided the given $l$-subset possesses sup-property.