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Vol.13 No.1

Attia Hazem A. pp.1-10
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Abstract

The unsteady Hartmann flow of an electrically conducting, viscous, incompressible fluid bounded by two parallel non-conducting porous plates is studied with heat transfer. An external uniform magnetic field and a uniform suction and injection are applied perpendicular to the plates while the fluid motion is subjected to a constant pressure gradient. The two plates are kept at different but constant temperatures while the Joule and viscous dissipations are included in the energy equation. The effect of the magnetic field and the uniform suction and injection on both the velocity and temperature distributions is examined.

Yang Ki-Yeol pp.11-18
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Abstract

Let f : (X, A) <TEX>${\rightarrow}$</TEX> (Y, B) be a map of pairs of compact polyhedra. A surplus Nielsen root number <TEX>$SN(f;X\;{\backslash}\;A,\;c)$</TEX> is defined which is lower bound for the number of roots on X \ A for all maps in the homotopy class of f. It is shown that for many pairs this lower bound is the best possible one, as <TEX>$SN(f;X\;{\backslash}\;A,\;c)$</TEX> can be realized without by-passing condition.

Kim Chang-Ho pp.19-38
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Abstract

We analyze the spectral collocation approximation for a parabolic partial integrodifferential equations(PIDE) with a weakly singular kernel. The space discretization is based on the spectral collocation method and the time discretization is based on Crank-Nicolson scheme with a graded mesh. We obtain the stability and second order convergence result for fully discrete scheme.

Rafiq Arif pp.39-46
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Abstract

We establish a general theorem to approximate fixed points of quasicontractive operators on a normed space through the Noor iteration process with errors in the sense of Liu [9]. Our result generalizes and improves upon, among others, the corresponding result of Berinde [1].

Mondal K.K. ; Samanta S.K. pp.47-69
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Abstract

In this paper, an idea of graded fuzzy net is introduced; its convergence is studied; Relations between g-net and g-filter are established in L-fuzzy setting.

Journal of the Korean Society of Mathematical Education Series B: The Pure and Applied Mathematics