Symbol (przeł. Piotr Napiwodzki)

Piotr Kulicki

Piotr Tarka*

The objective of the article is the comparative analysis of Likert rating scale based on the following range of response categories, i.e. 5, 7, 9 and 11 in context of the appropriate process of factors extraction in exploratory factor analysis (EFA). The problem addressed in the article is related primarily to the methodological aspects, both in selection of the optimal number of response categ...

Piotr Ćwiakowski Marek Giergiczny

of Technology Lecturer : Piotr Indyk

The goal is to acquire signals in R that are well approximated by sparse signals with k nonzero components, where k << n. The measurement process can be represented by an m× n matrix A, where m is roughly proportional to k rather than n. The recovery algorithm uses the sketch and a description of the measurement matrix to construct a signal approximation x̂ that has only O(k) nonzero components....

Fixpoints in Complete Lattices 1 Piotr

Theorem (5) states that if an iterate of a function has a unique fixpoint then it is also the fixpoint of the function. It has been included here in response to P. Andrews claim that such a proof in set theory takes thousands of lines when one starts with the axioms. While probably true, such a claim is misleading about the usefulness of proof-checking systems based on set theory. Next, we prov...