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Journal of Mathematical and Fundamental Sciences
Published by Institut Teknologi Bandung
ISSN : 23375760     EISSN : 23385510     DOI : https://doi.org/10.5614/j.math.fund.sci.
Core Subject : Science, Education,
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics
Journal of Mathematical and Fundamental Sciences welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Astronomy, Chemistry, Earth Sciences (Geodesy, Geology, Geophysics, Oceanography, Meteorology), Life Sciences (Agriculture, Biochemistry, Biology, Health, Medical, Pharmacy), Mathematics, Physics, and Statistics.
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 3 Documents
 1 
Search results for , issue "Vol. 6 No. 2 (1971)" : 3 Documents clear
Gerak Photon dalam Medan Gravitasi jang Kuat disekitar Bintang jang Mampat. Winardi Sutantyo
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 2 (1971)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Dalam tulisan ini, review mengenai gerak photon dalam medan gravitasi jang kuat diberikan. Photon jang dipantjarkan dari sekitar atau dalamnja sebuah bintang jang sangat mampat dapat lepas, djatuh kembali, atau bergerak dalam orbit lingkaran, bergantung pada arah mula2 dari ketjepatan photon. Abstract. In this paper, a review of the motion of photons in a strong gravitational field is given. Photon which are emitted from the neighborhood or from within a superdense star, may escape, falling or moving in a circular orbit, depending on the initial direction of the photons. 
Penjebaran Amphibia dan Reptilia didataran Tinggi Bandung H.S. Hardjasasmita
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 2 (1971)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Studi mengenai penjebaran vertical dari amphibia dan reptilian telah dikerdjakan disebelah utara dataran tinggi Bandung, Djawa Barat selama bulan September sampai dengan Desember 1968. Dikemukakan bahwa enamribu tahun jang lalu dipresi Bandung pernah merupakan suatu danau luas jang dibentuk oleh hasil kegiatan gunung berapi. Hasil koleksi terdiri dari 200 specimen, diantaranja 13 specie amphibian dan 39 species reptilia. Ditundjukkan bahwa djulah species pada tiap lokalitas tidak sama dan menundjukkan suatu korelasi jang baik dengan ketinggian tiap lokalitas.Abstract. A study on a vertical distribution of amphibians and reptiles has been conducted at the northern part of Bandung Highland, West Java between the month of September and December 1968. According to geologist, six thousand years ago the Bandung Depression was an extensive lake dammed by the product of volcanic activities. Two hundred specimens of 13 species of the reptiles have been collected. The number of species in each locality shows good correlation with the altitude. 
Produk Langsung Lengkap dari Grup K. Kromodihardjo
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 2 (1971)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Let Γ = {Gi} be a countable collection of groups. Then its cartesian product can be made into a group in a very obvious way. This new group is called the external direct product of the groups Gi from the collection Γ. On the other hand we have the internal direct product of subgroups of a group. For a finite collection the internal direct product of subgroups is isomorphic with the external direct product. It is no longer true when the collection is infinite, even countable. For an infinite collection of groups the direct product must be defined in the other way. The main purpose of this paper is to give a general concept of the direct product of an arbitrary collection of groups, which is called THE COMPLETE DIRECT PRODUCT OF GROUPS. 

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