Researchers have argued against deficit-based explanations of students’ troubles with mathematical sense-making, pointing instead to factors such as epistemology: students’ beliefs about the nature of knowledge and learning can hinder them from activating and integrating productive knowledge they have. But such explanations run the risk of substituting an epistemological deficit for a concepts/...

We investigate brother avoiding round robin doubles tournaments and construct several infinite families. We show that there is a BARRDT(n) that is not a SAMDRR(n) for all n > 4.

We study round-robin tournaments for n teams, where in each round a fixed number (g) of teams is present and each team present plays a fixed number (m) of matches in this round. In the tournament each match between two teams is either played once or twice, in the latter case in different rounds. We give necessary combinatorial conditions on the triples (n, g,m) for which such round-robin tourna...

A lonesum matrix is a (0, 1)-matrix uniquely determined by its column and row sums, and the sum of its all entries is called the “weight” of it. The generating function of numbers of weighted lonesum matrices of each weight is given. A certain explicit formula for the number of weighted lonesum matrices is also proved.

In the modeling of a large class of problems in science and engineering, the minimization of a functional is appeared. Finding the solution of these problems needs to solve the corresponding ordinary differential equations which are generally nonlinear. In recent years He’s variational iteration method has been attracted a lot of attention of the researchers for solving nonlinear problems. This...

This paper presents FLOWTEST a concept on testing interorganizational workflows on model-level. FLOWTEST focuses on building up test-models, deriving test-cases and executing tests on predefined workflows consisting of atomic web-services. The main goal of FLOWTEST is the realization of a test-suite to drive round-trip testing from code to model back to code level.

According to the ‘phonological deficit hypothesis’, problems in reading and spelling in dyslexic persons are due to poor representations of sounds in long term memory. As a result, the acquisition of the grapheme-phoneme correspondence and word decoding is assumed to be difficult. In this paper we describe a perception experiment to find evidence for poor phonological representations in 9-13 ye...