1 citations
4 papers
The cone length and category of maps: pushouts, products and fibrations
Martin Arkowitz, Donald Stanley, Jeffrey Strom
For any collection of spaces A, we investigate two non-negative integer homotopy invariants of maps: l_A(f), the A-cone length of f, and L_A(f), the A-category of f. When A is the…
The sectional category of a map
Martin Arkowitz, Jeffrey Strom
We study a generalization of the Svarc genus of a fiber map. For an arbitrary collection E of spaces and a map f:X-->Y, we define a numerical invariant, the E-sectional category of…
FeII/MgII, [Fe/Mg] Ratios and High-z Quasars
Kirk Korista, Nalaka Kodituwakku, Michael Corbin +1
It has been suggested in the literature that the (Fe/alpha) abundance ratio may be used as a chronometer, due to a delay in this ratio reaching its solar value as predicted by gala…
Electron correlation effects on the dielectric function of liquid metals
P. Giura, R. Angelini, C. A. Burns +2
The acoustic excitations of the expanded metal solutions Li-NH have been measured by inelastic X-ray scattering as a function of the electron density by changing the Li concent…