In this paper, some problems for isometric approximation are discussed. It is shown that an almost isometry from the unit ball of C(X) into the unit ball of C(Y
<正>1 Main Results Let Ω(?) R be a non-empty open subset with finite Lebesgue measure |Ω|1 and boundary Г= σΩ. We can write Ωas the union of its connected
<正>In this paper the singularly perturbed initial boundary value problem for the diffraction reaction diffusion system is considered.Using the comparison princ