let and be a sequence with non-negative entries. if , denote by the infimum of those satisfying the following inequality: whenever . the purpose of this paper is to give an upper bound for the norm of operator t on weighted sequence spaces d(w,p) and lp(w) and also e(w,?). we considered this problem for certain matrix operators such as norlund, weighted mean, ceasaro and copson matrices. th...

the object of this paper is to establish a summability factor theorem for summabilitya, , k  1 k  where a is the lower triangular matrix with non-negative entries satisfying certain conditions.

we obtain sufficient conditions for the series σanλn to be absolutely summable of order k by atriangular matrix.

it is proved that by using bounds of eigenvalues of an interval matrix, someconditions for checking positive de niteness and stability of interval matricescan be presented. these conditions have been proved previously with variousmethods and now we provide some new proofs for them with a unity method.furthermore we introduce a new necessary and sucient condition for checkingstability of interv...

1 School of Geography, Planning and Architecture, The University of Queensland, Brisbane, QLD 4072, Australia, 2 The Ecology Centre, The University of Queensland, Brisbane, QLD 4072, Australia, 3 New South Wales Department of Environment and Conservation, PO Box 1967, Hurstville, NSW 2220, Australia, 4 Australian Koala Foundation, GPO Box 2659, Brisbane, QLD 4001, Australia, 5 present address: ...

A wireless body area network (WBAN) is made up of small health-monitoring sensors that are implanted or placed on the human body. These collect and transmit medical physiological data . WBANs linked to servers observe health patients. Because its ability continuously remotely monitor patients' health, this type can save critical patients.WBAN being used establish communication links between the...