Any cubic crystal structure can be divided into small units in the form of congruent semi-regular (Archimedean) truncated octahedra. The centers of these polyhedra can be chosen at invariant equivalent positions for most cubic space groups. The part of a 0567-7394/79/060946-07501.00 crystal structure enclosed by an Archimedean polyhedron is called a geometric unit (or unit for short); however, ...

Tropical and non-Archimedean curves

The Dezert-Smarandache theory of plausible and paradoxical reasoning is based on the premise that some elements θi of a frame Θ have a non-empty intersection. These elements are called exhaustive. In number theory, this property is observed only in non-Archimedean number systems, for example, in the ring Zp of p-adic integers, in the field Q of hyperrational numbers, in the field R of hyperreal...

In this paper, some fixed point theorems for nonexpansive mappings in partially ordered spherically complete ultrametric spaces are proved. In addition, we investigate the existence of fixed points for nonexpansive mappings in partially ordered non-Archimedean normed spaces. Finally, we give some examples to discuss the assumptions and support our results.

We prove several multiplicity one theorems in this paper. For k a local field not of characteristic two, and V a symplectic space over k, any irreducible admissible representation of the symplectic similitude group GSp(V ) decomposes with multiplicity one when restricted to the symplectic group Sp(V ). We prove the analogous result for GO(V ) and O(V ), where V is an orthogonal space over k. Wh...

Let C v be a complete, algebraically closed non-archimedean field, and let f ∈ ( z ) rational function of degree d ≥ 2 . If satisfies bounded contraction condition on its Julia set, we prove that small perturbations have dynamics conjugate to those their sets.

Remark. The non-archimedean topology: Recall that if K is a field with a val­ uation | |, then it also is a metric space with d(x, y) = |x − y|. The topology has a basis of open neighborhoods given by B(x, ǫ) = {y ∈ K | |x − y| < ǫ}. If the valuation is nonarchimedean, then this metric space or topology is rather bizarre. For instance, the open balls don’t have a unique center: in fact, if we t...