Philippines a form of illegal gambling. Mahjong is played in some Philippine communities. Sabong or cockfighting is another popular entertainment especially among Filipino men, and existed prior to the arrival of the Spanish. Antonio Pigafetta, Magellan's chronicler, first documented this pastime in the kingdom of Taytay. The yo-yo, a popular toy in the Philippines, was introduced in its modern form by Pedro Flores with its name coming from the Ilocano language. Philippines The Philippines ( ; or ' ), officially the Republic of the Philippines (), is an archipelagic country in Southeast Asia. Situated in the western Pacific Ocean, it consists
Lie theory Lie theory In mathematics, the researcher Sophus Lie ( ) initiated lines of study involving integration of differential equations, transformation groups, and contact of spheres that have come to be called Lie theory. For instance, the latter subject is Lie sphere geometry. This article addresses his approach to transformation groups, which is one of the areas of mathematics, and was worked out by Wilhelm Killing and Élie Cartan. The foundation of Lie theory is the exponential map relating Lie algebras to Lie groups which is called the Lie group–Lie algebra correspondence. The subject is part of differential geometry since Lie