A proper edge t-coloring of a graph is a coloring of its edges with colors 1, 2, ..., t such that all colors are used, and no two adjacent edges receive the same color. For any integer n ≥ 3, all possible values of t are found, for which there exists such a proper edge t-coloring of the simple cycle C(n), which uses for each pair of adjacent edges either consecutive colors or the first and the ...

We present the photometric and spectroscopic study of the very luminous Type IIn SN 2006gy for a time period spanning more than one year. The evolution of multiband light curves, the pseudo-bolometric (BVRI) light curve and an extended spectral sequence are used to derive constraints on the origin and evolution of the SN. A broad, bright (MR ∼ −21.7) peak characterizes all monochromatic light c...

To mark the 20 th anniversary of the commencement of [email protected] (now arXiv.org), I've adapted this article from one 1 that first appeared in Physics World and was later reprinted (with permission) in Learned Publishing. This version is closer to my original draft, with some updates for this occasion, plus an astounding 2 5 added footnotes. 2 [email protected] received its first email...

A brief account of the obstacles faced during the introduction of hospital accreditation in Australia is provided, with some insight into the politics of change in health care. Some observations are made concerning critical elements of the accreditation program and the implications for the future of the Australian Council on Healthcare Standards.

We present the photometric and spectroscopic study of the very luminous Type IIn SN 2006gy for a time period spanning more than one year. The evolution of multiband light curves, the pseudo-bolometric (BVRI) light curve and an extended spectral sequence are used to derive constraints on the origin and evolution of the SN. A broad, bright (MR ∼ −21.7) peak characterizes all monochromatic light c...