http://popups.lib.uliege.be/1373-5411/index.php?id=4209 Index terms fr 0 http://popups.lib.uliege.be/1373-5411/index.php?id=4486 This essay is a discussion of the concept of reflexivity and its relationships with Laws of Form, self-reference, re-entry, eigenform and the foundations of physics. Fri, 11 Oct 2024 16:03:20 +0200 Fri, 11 Oct 2024 16:03:28 +0200 http://popups.lib.uliege.be/1373-5411/index.php?id=4486 http://popups.lib.uliege.be/1373-5411/index.php?id=4402 The author is a mathematician, trained in logic and recursion theory. When confronted to the needs of children in special education (behavioural problems, mental retardation, x-fragile syndrome, language disorders) he naturally decided to use logico-mathematical tools with them. He created an adapted methodology to use these tools in a nearly non verbal way. This new approach is called the "Non Verbal Communication Device" approach (NVCD). The purpose of this chapter is to describe and define the NVCD like approaches, the cognitive observations realized with them and then to try to answer the question "Why does it work ?" Thu, 10 Oct 2024 10:14:45 +0200 Thu, 10 Oct 2024 10:15:00 +0200 http://popups.lib.uliege.be/1373-5411/index.php?id=4402 http://popups.lib.uliege.be/1373-5411/index.php?id=2428 This paper deals with a comparison from the precision and stability point of view of different discrete algorithms for simulating differential equation systems, applied in the case of a simple differential system: the harmonic oscillator. It points out the relation between the classical and incursive algorithms and shows the effect of incursion on the precision and stability. Tue, 20 Aug 2024 11:46:18 +0200 Tue, 08 Oct 2024 13:34:57 +0200 http://popups.lib.uliege.be/1373-5411/index.php?id=2428