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# Browsing Mathematics by Title

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• (2020-10)
This article discusses the stability of the predator-prey model using the Holling-II and threshold harvesting functions against predator. Three of five equilibrium points obtained are stable as seen from the eigenvalues ...
• (Elfitra, 2022-12)
The rate of return is one of the important factors for investors in making decisions when they want to invest. The amount of return obtained can determine the level of price fluctuations over a certain period or can be ...
• (2017-01-12)
This article discusses the analysis of the scheduling time housing construction projects using Monte Carlo simulation and PERT methods. Both of these methods use a network to facilitate the scheduling of the project. ...
• (2013-04-24)
This paper discusses Woolhouse’s formula developed from a book by Dickson, Hardy and Waters . Woolhouse’s formula derived from the Euler-Maclaurin formula approach. Woolhouse’s formula used to determine the cash value ...
• (2013-03-26)
A formula called Woolhouse formula that obtained based on approach the Euler Maclaurin formula are discussed. Then Woolhouse formula is used to calculate present value of an annuity with payable m times a year. Here, n ...
• (Elfitra, 2022-10)
The 2020 school participation figure states that 20.56% of children in the disability category have the status of not/never been to school (BPS, 2020). This shows that there are still many children with disabilities who ...
• (2016-02-04)
This article studies the weighted Black-Litterman’s model in finding the optimization of portfolio invesment. The Black-Litterman’s model obtained by Bayesian approach is used to obtain the weighted values of each asset ...
• (Elfitra, 2022-12)
Forest fires are a crucial problem in Riau Province because they cause haze pollution that affects public activities and health. In 2019, based on data from the Health Office, victims of ARI disease have reached 281,626 ...
• (2017-01-10)
This article discusses closed Newton-Cotes rules with end corrections which are a modi cation of the closed Newton-Cotes rules to approximate the de nite integral. Numerical comparisons using two de nite integrals show ...
• (2014-03-25)
This article discusses some alternative proofs of Simson theorem, which states the specific form of the three points of intersection lines on the sides of the triangle. In these alternative proofs, the principle of parallel ...
• (2016-04-27)
This paper discusses some equivalent conditions for reverse order law of group inverses of product of two matrices. Several sufficient conditions which enable both (AB)# = B(1,2)A(1,2) and (AB)# = B(1,2)A(1,2) hold are ...
• (2020-07)
This article discusses the identities of finite sum of the reciprocal and reciprocal square Fibonacci numbers with two, three or four functions of sums of the Fibonacci numbers. The sum solution is found by using floor ...
• (2021-03)
This articel discusses some congruences on harmonic numbers and Bernoulli num- bers. The study is completed using several harmonic identities, congruence modulo properties and algebraic calculations. Futhermore it can ...
• (2016-02-04)
This article discusses the iterative method by combining two Newton’s methods where the second step of Newton’s method is given a weighted function. By pro- viding specific requirements for this weighting function, it ...
• (wahyu sari yeni, 2019-04-23)
This articel discusses some development of numbers and series on triangular number. Then the development of numbers and series on triangular number involved in this study are the sum and difference in triangular number, ...
• (2014-03-25)
This article discusses some of the algebraic properties of the generalized inverse matrix on the addition operation, which is derived using the properties of the sum of the rank of matrices. Generalized inverse of the sum ...
• (2021-01)
This article discusses some properties of de cient perfect numbers that is, every odd perfect numbers have a de cient perfect numbers. Then, there are odd perfect numbers and Descartes numbers from the de cient perfect ...
• (2013-07-26)
This paper discusses a technique to simplify a general cubic surface equation in the projective space to form a normal form z2=f(x,y) , in which f ( x, y) is a polynomial of degree four. The process is started by simplifying ...
• (perpustakaan UR, 2021-07)
Biosynthesis of silver (Ag) nanoparticles has been carried out by reacting pineapple peel extract as a reductant and 5 mM AgNO3 solution. The nanoparticle synthesis process was done at a temperature of 80oC for 30 ...
• (Elfitra, 2022-07)
Relationship analysis on spatial data can be done by using the method Geographically Weighted Poisson Regression (GWPR), which is a local form of Poisson regression which is applied to spatial data, where location is ...