A connected graph G is called t-perfect if its stable set polytope is determined by the non-negativity, edge and odd-cycle inequalities. Moreover, G is called strongly t-perfect if this system is totally dual integral. It is an open problem whether t-perfection is equivalent to strong t-perfection. We prove the equivalence for the class of claw-free graphs.

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High-resolution X-ray diffractometry, absolute integrated intensity ( ) measurements, diffuse X-ray scattering (DXS) and infrared (IR) absorption techniques were used to investigate the in ̄uence of oxygen on the structural perfection of high purity (resistivity of the order of 4 k cm) ̄oat zone (FZ) grown (111) silicon single crystals. A multicrystal diffractometer set in …‡;ÿ;ÿ;‡† geometry, wit...

Most research on the Poggendorff illusion has focused on explaining the effect. Poggendorff illusion, it doesnt naturally predict the reduction in the illusion.dicted the perceived angle in a modified Poggendorff illusion task with an extra thick bar. The concept of disinhibition employed in the model is general enough. A new explanation for the Poggendorff illusion. The application of this exp...