We construct unstable classical solutions of Yang-Mills theories and their dual unstable states of type IIB on AdS5. An example is the unstable D0-brane of type IIB located at the center of AdS. This has a field theory dual which is a sphaleron in gauge theories on S3 × R. We argue that the two are dual because both are sphalerons associated to the topology of the instanton/D-instanton. This ag...

We give constructions of self-dual and formally self-dual codes from group rings where the ring is a finite commutative Frobenius ring. We improve the existing construction given in [11] by showing that one of the conditions given in the theorem is unnecessary and moreover it restricts the number of self-dual codes obtained by the construction. We show that several of the standard constructions...

Classical Bose-Chaudhuri-Hocquenghem (BCH) codes C that contain their dual codes can be used to construct quantum stabilizer codes this chapter studies the properties of such codes. It had been shown that a BCH code of length n which contains its dual code satisfies the bound on weight of any non-zero codeword in C and converse is also true. One impressive difficulty in quantum communication an...

This article presents findings from five repertory grid interviews conducted in early 2001 to identify attributes of information as an asset. Repertory grid is a technique developed by George Kelly based on his theory of personal constructs. Personal construct theory (PCT) assumes that individuals are their own ‘personal scientists’ who mentally represent the world around them. The method was u...

Work is currently in progress on the following projects: What do experts/novices know about programming. T1 The objective here is to develop a plan-based theory of programming knowledge and to test it empirically with novice and expert programmers. We are also using this theory to study the bugs and misconceptions of novice programmers. Cognitively appropriate programming language constructs.’ ...

Like other constructivist approaches, Personal Construct Theory (PCT) views human activity as a meaning creating process. What human organisms do, is informed by the way they construe events, and in turn assign meaning to those events. Symptoms are a rare, but legitimate part of their activity. They challenge our everyday conceptions regarding human behaviour. From a personal construct perspect...

It is known that every class-regular symmetric μ,m -net is tactical. Also it is known that all μ,m nets with m 2 or μ 1 are tactical. In the work of Al-Kenani and Mavron 2003 , it is proved that every symmetric net with m 3 is tactical if and only if it is class regular. In this paper, we construct 2, 4 -net and show that it is class regular and therefore tactical. New necessary and sufficient ...

We study the algebra of Weyl modules in types $A$ and $C$ using methods arcs over toric degenerations functional realization dual space. compute generators relations this construct its basis.