Results 51 to 60 of about 70,685 (147)
Ordering Principles in Niobium Tungsten Oxides of the Tetragonal Tungsten Bronze Type
Zeitschrift für anorganische und allgemeine Chemie, Volume 651, Issue 16, November 14, 2025.By filling a part of the pentagonal tunnels in a tetragonal bronze type unit, ordered structures are formed for well‐defined compositions whereas others lead to defective intergrowth structures that can be characterized by high‐resolution electron microscopy methods.
Frank Krumeich, Michael Wörle
wiley +1 more source
Congruence lattices of free lattices in non-distributive varieties
, 2005 We prove that for any free lattice F with at least $\aleph\_2$ generators in any non-distributive variety of lattices, there exists no sectionally complemented lattice L with congruence lattice isomorphic to the one of F.
Ploscica, Miroslav +2 more
core
Congruence amalgamation of lattices
, 2005 J. Tuma proved an interesting "congruence amalgamation" result. We are generalizing and providing an alternate proof for it. We then provide applications of this result: --A.P.
Grätzer, George +2 more
core
On the Complexity of Polytope Isomorphism Problems
, 2002 We show that the problem to decide whether two (convex) polytopes, given by their vertex-facet incidences, are combinatorially isomorphic is graph isomorphism complete, even for simple or simplicial polytopes. On the other hand, we give a polynomial time
Kaibel, Volker, Schwartz, Alexander
core +3 more sources
Towards Counting Paths in Lattice Path Models with Filter Restrictions and Long Steps
Journal of Mathematical Sciences, 2023 D. P. Solovyev
semanticscholar +1 more source
Definite orthogonal modular forms: computations, excursions, and discoveries. [PDF]
Res Number Theory, 2022 Assaf E +5 more
europepmc +1 more source
MAXIMIZING UNAMBIGUOUS VELOCITY RANGE IN PHASE-CONTRAST MRI WITH MULTIPOINT ENCODING. [PDF]
Proc IEEE Int Symp Biomed Imaging, 2022 Zhao S, Ahmad R, Potter LC.
europepmc +1 more source
Geographic style maps for two-dimensional lattices. [PDF]
Acta Crystallogr A Found Adv, 2023 Bright M, Cooper AI, Kurlin V.
europepmc +1 more source
The congruence lattice of an ideal extension of semigroups
Glasgow Mathematical Journal, 1993 M. Petrich
semanticscholar +1 more source
Translates of rational points along expanding closed horocycles on the modular surface. [PDF]
Math Ann, 2022 Burrin C, Shapira U, Yu S.
europepmc +1 more source