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Grading systems for universities are different. Grades are usually assigned in letters, following four-point system. Generally, Indonesian universities equate A with numerical value of 4.0 and E with 0.0. Some universities also employs intermediate grades such as A- and B+. This following list describes customary grade boundaries:
A KKM covering is defined as a set , …, of closed sets such that for any {, …,}, the convex hull of the vertices corresponding to is covered by . The KKM lemma says that in every KKM covering, the common intersection of all n sets is nonempty , i.e: