In this paper we investigate effective descent morphisms in categories of reflexive and transitive lax algebras. We show in particular that open and proper maps are effective descent, result that extends the corresponding results for the category of topological spaces and continuous maps. Introduction A morphism p : E → B in a category C with pullbacks is called effective descent if it allows a...

Adolescence is a period of growth that has special nutritional needs to support daily activities and growth. Likewise for an athlete, the main problem often encountered by national athletes lack stamina endurance. The fatigue factor followed slow body recovery process can reduce athlete’s performance. One things affect this intake. nutritionally vulnerable age because rapid if eating habits not...

leiomyoma is a rare benign neoplasm deriving from smooth muscle. vascular leiomyoma is its most common subtype in the oral cavity. it may appear at any age with the greatest incidence in the 4th and 5th decade of life. the common manifestation is a slow-growing, asymptomatic, submucousal mass. the diagnosis is only through microscopic examination requiring special staining. treatment of choice ...