Baxendell's Observations of Variable Stars. Seventh Instalment: No. 17, R Sagittae; No. 18, R Serpentis; No. 19, T Serpentis

Connecticut College News Vol. 19 No. 17

On r-Connected Graphs with No Semi-topological r-Wheel

A semi-topological r-wheel, denoted by Sr, is a subdivision of the r-wheel preserving the spokes; the paper describes the r-connected graphs having no Sr-subgraphs. For r > 3, these are shown to be only Kr,r, while the class H of 3-connected S3-free graphs is unexpectedly rich. First, every graph G in H has an efficiently recognizable set of “contractible edges” (sometimes empty) such that a co...

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NIH Guide - Vol. 17, No. 18 - May 20, 1988

The NIH Guide annoiinces scientific initiathes and provides polic) and administrative infomiation t o indtvi­ duals and organizations \vho need t o be kept informed o f oppc,niinities. reqiiiremenn, and changes i n extra­ niiird programs administered by the National Institutes ofllealth 0 Check here ifyour address has changed and you wish to con­ tinue receiving this publication. Make correctio...