So the students ask whether Albert & Ronitt could give the surprise quiz Thursday? They observe that if the quiz wasn’t given before Thursday, it would have to be given on the Thursday, since they already know it can’t be given on Friday. But having figured that out, it wouldn’t be a surprise if the quiz was on Thursday either. Similarly, the students reason that the quiz can’t be on Wednesday,...

We present an educational resource based in an optical software package for undergraduate students. It consists in a web based textbook with several applets for illustrating the theory and simplify the teaching tasks in the classroom. These programs are also used as a method for self-learning in an on-line environment. Applets are written in Java language using the Java Network Launching Protoc...

A 1994 University of Chicago study entitled The Social Organization of Sexuality found that on average men have 74% more opposite­gender partners than women, confirming a view that men are more promiscuous. But whoever reported this finding was lying or confused! We’ll show you how to use the properties of vertex degrees in a graph to prove this. Let’s recast opposite­gender partnering in graph...

This study assesses the incidence of Covid-19 pandemic on poverty levels in 50 African countries by employing PovcalNet computational tool for monitoring. The empirical evidence is based on: (i) Pre macroeconomic projections October 2019 and revised April 2020 (ii) three thresholds, notably, US$1.90, US$3.20, US$5.50 per day extreme, middle higher lines. following main findings are established....

. We consider a multivariate continuous time process, generated by a system of linear stochastic di¤erential equations, driven by white noise and involving coe¢ cients that possibly vary over time. The process is observable only at discrete, but not necessarily equally-spaced, time points (though equal spacing signi…cantly simpli…es matters). Such settings represent partial extensions of ones s...

This paper presents a method for computing two-dimensional constant mean curvature surfaces. The method in question uses the variational aspect of the problem to implement an efficient algorithm. In principle it is a flow like method in that it is linked to the gradient flow for the area functional, which gives reliable convergence properties. In the background a preconditioned conjugate gradie...

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1 Institute of Psychology, Department of Clinical Psychology, University of Szczecin, Krakowska 69, 71-017 Szczecin, Poland; E-Mails: [email protected] (A.S.); [email protected] (M.C.) 2 University Center for Education, University of Szczecin, Szwoleżerów 18a, 71-062 Szczecin, Poland; E-Mail: [email protected] 3 Department of Psychiatry, Pomeranian Medical University, Broniewskiego 26, 71-460 Szczec...