You are here: Home - Discount Moncler Jackets Women Sω or S2 respectively 2 Let
Discount Moncler Jackets Women Sω or S2 respectively 2 Let
Let Sω and S2 denote the sequential fan and Arens' space, respectively. In this paper, we shall prove the following main results. (1) If Π∞i=1Xi contains a copy of Sω (S2), then some Πni=1Xi contains a copy of Sω (Sω or S2, respectively). (2) Let f: X → Y be a closed map such that any f-1(y) contains no closed copy of Sω (S2). If X contains a closed copy of Sω (S2), then Y contains a closed copy of Sω (Sω or S2, respectively).As applications of (1) and (2), we shall consider the Fréchet or strongly Fréchetness, or sequentiality of Moncler Stockists Online products of finitely or countably many spaces. A method is described to calculate exactly the number of photons emitted per scintillation in an NaI(Tl) crystal when a γ-ray is completely absorbed. A special crystal geometry is employed, and corrections made for Discount Moncler Jackets Women reflection and absorption losses between the crystal and the photomultiplier used as a detector. Spectral measurements are also made, to account for the variation of the photomultiplier response with the wavelength of the light incident on it. An estimate is made of the transmission loss between crystal and photomultiplier in a conventional assembly.