We consider the convergence in norm of several iterative implementations of linear multiuser receivers, under the assumption of long random spreading sequences. We find that asymptotically, linear parallel interference cancellation diverges for systems loads of greater than about 17%. Using known results from the theory of iterative solutions for linear systems we derive optimal or near optimal...

We show that six-dimensional backgrounds that are T 2 bundle over a Calabi–Yau two-fold base are consistent smooth solutions of heterotic flux compactifications. We emphasize the importance of the anomaly cancellation condition which can only be satisfied if the base is K3 while a T 4 base is excluded. The conditions imposed by anomaly cancellation for the T 2 bundle structure, the dilaton fiel...

Recent research reported evidence that contradicts cumulative prospect theory and the priority heuristic. The same body of research also violates two editing principles of original prospect theory: cancellation (the principle that people delete any attribute that is the same in both alternatives before deciding between them) and combination (the principle that people combine branches leading to...

We introduce shortcut graphs and groups. Shortcut are in which cycles cannot embed without metric distortion. groups act properly cocompactly on graphs. These notions unify a surprisingly broad family of interest geometric group theory graph theory, including: the 1-skeletons systolic quadric complexes (in particular finitely presented C(6) C(4)-T(4) small cancellation groups), finite dimension...

We show that, to all orders of powers of the gauge potential, a gauge anomaly A defined on 4-dimensional infinite lattice can always be removed by a local counterterm, provided that A depends smoothly and locally on the gauge potential and that A reproduces the gauge anomaly in the continuum theory in the classical continuum limit: The unique exception is proportional to the anomaly in the cont...

We present calculation of the anomaly cancellation in M–theory on orbifolds S/ZZ2 and T /ZZ2 in the upstairs approach. The main requirement that allows one to uniquely define solutions to the modified Bianchi identities in this case is that the field strength G be globally defined on S1 or T 5 and properly transforming under ZZ2. We solve for general G that satisfies these requirements and expl...

In this paper we present our implementation of a system of active logic that processes natural language discourses. We focus on problems that involve presupposition and the associated well{known problems of the projection of presupposition. We discuss Heim's largely successful theory of presupposition and point out certain limitations. We then use these observations to build our discourse proce...

We study the constraints on models with extra dimensions arising from local anomaly cancellation. We consider a five-dimensional field theory with a U(1) gauge field and a charged fermion, compactified on the orbifold S/(Z2 × Z2). We show that, even if the orbifold projections remove both fermionic zero modes, there are gauge anomalies localized at the fixed points. Anomalies naively cancel aft...

We study gravitational anomalies for fivebranes in M theory. We show that an apparent anomaly in diffeomorphisms acting on the normal bundle is cancelled by a careful treatment of the M theory Chern-Simons coupling in the presence of fivebranes. One interesting aspect of our treatment is the way in which a magnetic object (the fivebrane) is smoothed out through coupling to gravity and the resul...

The thesis treats theory and implementation aspects for stereophonic acoustic echo cancellation. In Paper I a complete implementation of a stereophonic acoustic echo canceler based on the two-channel fast recursive least-squares algorithm is presented. An analysis of the system calculation complexity is also given, in addition to simulation results on recorded real-life data. Paper II presents ...