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National examination in Indonesia. National Exam (Indonesian: Ujian Nasional, commonly abbreviated as UN or UNAS) [1] was a standard evaluation system of primary and secondary education in Indonesia and the determining factor of quality of education levels among the areas that are conducted by the Center for Educational Assessment of the Ministry of Education and Culture.
Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.