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# Browsing Mathematics by Title

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• (Elfitra, 2022-03)
This article discusses about the inventory management of resources by considering the discount of raw materials provided by suppliers. In this discussion, an economic order quantity (EOQ) model with discount quantity is ...
• (Elfitra, 2023-11)
The welfare of workers at retirement age is an important factor in ensuring ful llment of needs in old age, especially workers who work for a company or a government agency. Workers must have an early plan that can ...
• (2014-03-25)
This paper discussed about three the ratio-product estimators for mean population in the stratified random sampling. It is combinations of ratio estimator and product estimator in stratified random sampling. This paper ...
• (2013-03-26)
Two types estimator for finite population mean in double sampling are ratio and product. These types are both proposed by Sukhatme and Srivastava so that four estimators are obtained. Four this estimator usually bias ...
• (2012-10-14)
We discuss prove the Erdős-Mordell Inequality. We will use signed distances from the sides of a triangle to prove that Erdős-Mordell Inequality not only to interior point of triangle, but also to exterior point of triangle. ...
• (2021-03)
This article discusses the diagonalization of a matrix triangular fuzzy numbers in interval form. Negative positive triangular fuzzy number based on geometrical area can be used to determine eigenvalues and eigenvector ...
• (2013-07-20)
We discuss a method to obtain an inverse of a nonsingular matrix, called Augmenta- tion and Reduction Method. The total computational cost of this method to obtain an inverse of a matrix is the same as those of Gauss-Jordan ...
• (2013-07-12)
Relation between two variables x and y are not always linear, but also non-linear. Scatter diagram from non-linear relationship will show a pattern of data points that can be approximated by an exponential curve. The ...
• (2017-01-18)
This article discusses the determination of primality criterion based on Lucas congruence. The result of the primality criterion based on Lucas congruence is determined by using coefficient binomial and Lucas theorem.
• (Elfitra, 2023-11)
This article discusses the use of the Set Covering Problem (SCP) model in determining the optimal location and number of fire stations in Pekanbaru City. The SCP model includes Location Set Covering Problem (LSCP) and ...
• (2013-07-17)
Prospective reserve of term life insurance pairwise is determined by using the assumptions of net premiums which is influenced by the agent commission fee on life insurance companies. In this paper, a prospective reserve ...
• (2016-04-27)
This article discusses how to obtain eigenvalues and their corresponding eigenvectors of tridiagonal matrices of the form                            a b c a b a b c b ...
• (2020-11)
This article discusses how to nd the eigenvalues and eigenvectors of matrix trapezoidal fuzzy numbers. Trapezoidal fuzzy numbers are expressed as positive or negative fuzzy numbers. The goal is to determine the algebraic ...
• (2020-12)
This article discusses the determination of the eigenvalues and eigenvectors of a triangular fuzzy number matrices. The negative-positive de nition triangular fuzzy number is expressed based on its geometrical area. The ...
• (2014-03-25)
This paper discusses the probability of the state when surplus become negative at the first time in the insurance. That is called the probability of ruin, for the claim amount is supposed to be a combination of exponential ...
• (Elfitra, 2022-01)
The number of online shopping transactions in Indonesia has grown over the last ten years by 17% and the total number of e-commerce businesses has reached 26.2 million units. This creates competition that requires companies ...
• (Elfitra, 2023-10)
This article discusses the Sylvester matrix of order (n + 1) × (n + 1), the Sylvester matrix is a tridiagonal matrix that has main diagonal entries are real numbers, the upper subdiagonal entries are 1, 2, . . . , n while ...
• (2016-04-26)
This article discusses n-th derivative function of the term 1/f(x) and h(x)/f(x) where f(x) ̸= 0 by applying the partition numbers of n and n-th derivative of composite function called Faa di Bruno formula. Then we present ...
• (2016-02-04)
This articel studies the explicit formula for a function to enumerate the number of primes less than or equal to n called Prime Counting Function, where n is natural number. Prime Counting Function is denoted by π(n). ...
• (2013-03-16)
݊ × ݊ (݊ ≥ 5) matrices by reducing their sizes by four, it is known as the Cornice Method. A determinant of matrices with the exception of the first and the last entries, the entries of the 2nd row and (݊ − 1) − ‫ݐ‬h ...