the matrix functions appear in several applications in engineering and sciences. the computation of these functions almost involved complicated theory. thus, improving the concept theoretically seems unavoidable to obtain some new relations and algorithms for evaluating these functions. the aim of this paper is proposing some new reciprocal for the function of block anti diagonal matrices. more...

Abstract Studies report that subjective and objective sleep parameters often do not agree with each other. This study examined if discordance between measures are associated cognition. Participants from the Midlife in United States (n=627) provided (self-report) (actigraphy) duration quality. Discordance was assessed by absolute difference z-scores variable. Cognitive function measured Brief Te...

Total knee replacement (TKR) is one of the most common operations in orthopaedic surgery worldwide. Despite its scientific reputation as mainly successful, only 81% to 89% of patients are satisfied with the final result. Our understanding of this discordance between patient and surgeon satisfaction is limited. In our experience, focus on five major factors can improve patient satisfaction rates...

Three patients with ventriculoarterial concordance and an abnormal atrioventricular connexion were investigated. One patient had total anomalous pulmonary venous connexion to a left vertical vein. In 1972 this was repaired and a ventricular septal defect was closed, but the presence of atrioventricular discordance was missed and the patient died. In the other two patients, Mustard's operation r...

Neurological involvement is common in patients infected with HIV. The effectiveness of antiretroviral drugs in lowering the levels of HIV-RNA in cerebrospinal fluid (CSF) is limited by their inability to cross the blood-brain barrier. Discordance in CSF/plasma HIV-RNA levels may have a bearing on the progression of neurological disease in these patients. We report a woman with subacute neurocog...

Monozygotic (MZ) twins have been used for decades in genetic-epidemiological studies to tease out the relative contributions of genes and the environment to a trait. Phenotypic discordance in MZ twins has traditionally been ascribed to non-shared environmental factors acting after birth, however recent data shows this explanation as being far too simple. We review here other reasons for discord...