# Search results for: Piotr Niemiec

Nafta-Gaz > 2020 > R. 76, nr 8 > 550--556

Applied Catalysis A, General > 2017 > 542 > Complete > 317-326

_{12}O

_{40}, or within the Keggin anion, i.e., TBA

_{4}HPW(Mo)

_{11}CoO

_{39}(TBA=tetrabutylammonium)...

Journal of Molecular Structure > 2017 > 1135 > C > 20-25

^{2+}ion (Cu-HPA) has been presented. The...

Israel Journal of Mathematics > 2016 > 212 > 2 > 507-520

Open Mathematics > 2014 > 12 > 6 > 887-895

Central European Journal of Mathematics > 2014 > 12 > 6 > 887-895

*Q*or Ω =

*ℓ*

_{2}, then there exists a functor of extension of maps between

*Z*-sets in Ω to mappings of Ω into itself. This functor transforms homeomorphisms into homeomorphisms, thus giving a functorial setting to a well-known theorem of Anderson [Anderson R.D., On topological infinite deficiency, Michigan Math. J., 1967, 14, 365–383]. It also preserves convergence of sequences...

Open Mathematics > 2013 > 11 > 7 > 1304-1316

Advances in Mathematics > 2013 > 235 > Complete > 398-449

Central European Journal of Mathematics > 2013 > 11 > 7 > 1304-1316

*X*and a finite measure space (

*Ω*, , µ), the space

*M*

_{µ}(

*X*) of all equivalence classes (under the relation of equality almost everywhere mod µ) of -measurable functions from Ω to

*X*, whose images are separable, equipped with the topology of convergence in measure, and some of its subspaces are studied. In particular, it is shown that

*M*

_{µ}(

*X*) is homeomorphic...

Studia Mathematica > 2012 > 208 > 1 > 77-85

Rozprawy Matematyczne

Bulletin of the Polish Academy of Sciences. Mathematics > 2012 > 60 > 3 > 295-306

Annales Polonici Mathematici > 2012 > 104 > 1 > 105-108

Applied Categorical Structures > 2012 > 20 > 3 > 303-322

*normed topological pseudovector group*(NTPVG for short) is a valued topological group (

*V*, + ,||·||) (not necessarily Abelian) endowed with a continuous scalar multiplication ${\mathbb R}_+ \times V \ni (t,x) \mapsto t \cdot x \in V$ such that 0 ·

*x*=

*e*(

*e*denotes the neutral element of

*V*), 1 ·

*x*=

*x*, (

*st*) ·

*x*=

*s*·(

*t*·

*x*),

*t*·(

*x*+

*y*) = (

*t*·

*x*) + (

*t*·

*y*) and ||

*t*·

*x*|| =

*t*||

*x*|| for each

*t*, ...

Acta Mathematica Sinica, English Series > 2012 > 28 > 8 > 1531-1552

*Michigan Math. J.*,

**33**, 291–313 (1986)] on strong

*Z*-sets in ANR’s and absorbing sets is generalized to nonseparable case. It is shown that if an ANR

*X*is locally homotopy dense embeddable in infinite-dimensional Hilbert manifolds and

*w*(

*U*) =

*w*(

*X*) (where “

*w*” is the topological weight) for...

Topology and its Applications > 2012 > 159 > 1 > 315-321

Topology and its Applications > 2011 > 158 > 3 > 352-359

Applied Categorical Structures > 2011 > 19 > 6 > 959-967

Integral Equations and Operator Theory > 2011 > 71 > 2 > 151-160

*T*of a Hilbert space $${\mathcal{H}}$$ into a Hilbert space $${\mathcal{K}}$$ are defined, motivated by the inequality $${|\langle{Tx}, {y}\rangle}_{\mathcal{K}}|^2 \leq \langle|T|x, {x}\rangle_{\mathcal{H}}\langle{|T^{*}|y}, {y}\rangle_{\mathcal{K}}$$ . It is shown...