Amenable category is a variant of the Lusternik-Schnirelman category, based on covers by amenable open subsets. We study monotonicity problem for degree-one maps and relation between topological complexity.

With Ventricular Tachyarrhythmias and Normal Coronary Arteriograms To the Editor: Ouyang et al1 report on 4 patients with recurrent exerciseinduced syncope attributable to fast ventricular tachycardia, aneurysms in the inferior-lateral wall of the left ventricle, and a peculiar subepicardial arrhythmogenic substrate. The authors speculate that this presentation may constitute a distinct clinica...

abstract. let r be a 2-torsion free ring with identity. in this paper, first we prove that any jordan left derivation (hence, any left derivation) on the full matrix ringmn(r) (n  2) is identically zero, and any generalized left derivation on this ring is a right centralizer. next, we show that if r is also a prime ring and n  1, then any jordan left derivation on the ring tn(r) of all n×n up...

Cavernoma is a benign tumour of the orbit. It results in proptosis, visual disturbance, diplopia and ptosis eye. amenable to surgery without recurrence. We report case left orbital cavernoma female, who presented with non-pulsatile painless no perception light. Her MRI revealed orbit inferior optic nerve. She was operated by endoscopic transmaxillary orbitotomy. This easily removed tumour, avoi...