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"This memorial volume contains articles by prominent mathematicians in a variety of areas of the field, namely number theory, analysis, and geometry, representing Lang’s own breadth of interest and impact. A special introduction by John Tate includes a brief and fascinating account of the Serge Lang’s life. This volume's group of 6 editors are also highly prominent mathematicians and were close to Serge Lang, both academically and personally. The volume is suitable to research mathematicians in the areas of number theory, analysis, and geometry."

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Parameter keberhasilan pendidikan dapat diukur dengan melakukan penilaian pendidikan berupa evaluasi. Dalam melakukan evaluasi, khususnya evaluasi hasil belajar, umumnya guru menggunakan sistem ujian. Penelitian ini dilakukan untuk menganalisis kualitas soal ujian Matematika yang dibuat oleh guru dan memprediksi kemampuan Matematika siswa SMA Negeri A Kota Bekasi. Data yang digunakan merupakan soal, kunci jawaban dan jawaban ujian akhir semester SMA Negeri A Kota Bekasi mata pelajaran Matematika dengan subjek 148 siswa SMA Negeri A Kota Bekasi kelas 10 tahun ajaran 2019/2020. Metode yang digunakan untuk mencapai tujuan tersebut adalah Item Response Theory dengan 4 parameter. Hasil yang diperoleh menunjukkan bahwa dari 30 butir soal ujian yang dibuat oleh pihak sekolah, terdapat 19 butir soal yang berkualitas cukup baik untuk mengukur kemampuan siswa. Hasil analisis berdasarkan seluruh item, diperoleh bahwa dari 148 orang peserta yang mengikuti ujian Matematika SMA Negeri A Kota Bekasi terdapat 25 orang peserta yang memiliki tingkat kemampuan rendah, 97 orang peserta yang memiliki tingkat kemampuan sedang, dan 26 orang peserta yang memiliki tingkat kemampuan tinggi. Hasil analisis berdasarkan item berkualitas baik, diperoleh bahwa dari 148 orang peserta yang mengikuti ujian Matematika SMA Negeri A Kota Bekasi terdapat 21 orang peserta yang memiliki tingkat kemampuan rendah, 103 orang peserta yang memiliki tingkat kemampuan sedang, dan 24 orang peserta yang memiliki tingkat kemampuan tinggi.

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The parameters of educational success can be measured by conducting an educational assessment in the form of an evaluation. In the process of evaluation, especially learning outcomes evaluation, teachers generally use the examination system. The purposes of this research are to analyze the quality of Mathematics exam questions made by teachers and predict the Mathematics ability of A High School students in Bekasi City. The data used are the exam questions, answer keys of exam questions and students answers to the Mathematics final exam of the A High School in Bekasi City with 148 subjects of 10th grade of A High School students in Bekasi 2019/2020. The method used to achieve these purposes is Item Response Theory with 4 parameters. The results of this study obtained show that from 30 exam questions made by the school, there are 19 items with good quality to measure the ability of students. The results of the analysis based on all items, it was found that from 148 students who took the Mathematics Examination at the A High School in Bekasi, there are 25 students with low levels of ability, 97 students with medium levels of ability, and 26 students with high levels of ability. The results of the analysis based on good quality items, it was found that from 148 students who took the Mathematics Examination at the A High School in Bekasi, there are 21 students with low levels of ability, 103 students with medium levels of ability, and 24 students with high levels of ability.

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"Homotopy Analysis Method in Nonlinear Differential Equations" presents the latest developments and applications of the analytic approximation method for highly nonlinear problems, namely the homotopy analysis method (HAM). Unlike perturbation methods, the HAM has nothing to do with small/large physical parameters. In addition, it provides great freedom to choose the equation-type of linear sub-problems and the base functions of a solution. Above all, it provides a convenient way to guarantee the convergence of a solution. This book consists of three parts. Part I provides its basic ideas and theoretical development. Part II presents the HAM-based Mathematica package BVPh 1.0 for nonlinear boundary-value problems and its applications. Part III shows the validity of the HAM for nonlinear PDEs, such as the American put option and resonance criterion of nonlinear travelling waves. New solutions to a number of nonlinear problems are presented, illustrating the originality of the HAM. Mathematica codes are freely available online to make it easy for readers to understand and use the HAM. "

"This book presents some of the most recent results in the field of nonlinear analysis. Dedicated to Themistocles M. Rassias on the occasion of his 60th birthday, this volume contains 44 articles on various developments in the field, pertaining to subjects such as the stability of functional equations, variational systems, geometric analysis, analytic inequalities, approximation theory and optimization, as well as their applications. Many of the chapters are related to the seminal contributions of Th. M. Rassias and are based upon his initial findings"