To the Editor: No one knows how many people die due to HIV-related causes in South Africa every year. According to the latest statistical release, HIV is the 9th leading underlying cause of death in the country.1 This is hard to believe. Research has shown that only about 25% of all deaths related to HIV are notified as such2 – either ‘HIV’ as an underlying or contributing cause of death is lef...

this paper consists of three sections. in the first section an efficient method is used for decomposition of the canonical matrices associated with repetitive structures. to this end, cylindrical coordinate system, as well as a special numbering scheme were employed. in the second section, divide and conquer method have been used for eigensolution of these structures, where the matrices are in ...

A possible resolution of the information loss paradox for black holes is proposed in which a phase transition occurs when the temperature of an evaporating black hole equals a critical value, Tc, and Lorentz invariance and diffeomorphism invariance are spontaneously broken. This allows a generalization of Schrödinger’s equation for the quantum mechanical density matrix, such that a pure state c...