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Type :article
Subject :QA Mathematics
Main Author :Rawdah Adawiyah Tarmizi
Additional Authors :Hajar Sulaiman
Title :Pencirian kumpulan-5 yang mempunyai litupan-11 dengan persilangan bebas-teras
Place of Production :Tanjong Malim
Publisher :Fakulti Sains dan Matematik
Year of Publication :2021
Corporate Name :Universiti Pendidikan Sultan Idris

Abstract : Universiti Pendidikan Sultan Idris
Andaikan G adalah kumpulan terhingga. Jika terdapat suatu set yang mengandungi n subkumpulan wajar dalam G yang kesatuannya merangkumi semua unsur bagi G, maka G merupakan kumpulan terlitup. Set bagi n subkumpulan wajar dipanggil litupan-n bagi G dan bilangan minimum bagi n yang melitupi G ialah 3, ini bermakna n X 3 . Jika litupan-n tidak mempunyai subset wajar yang juga melitupi G, maka ia dipanggil litupann tak berlebihan bagi G dan ia dipanggil litupan-n maksimal jika ia mengandungi hanya subkumpulan maksimal bagi G. Suatu litupan-n tak berlebihan maksimal dengan persilangan bebas-teras dikenali sebagai suatu litupan-Xn. Kajian ini mencirikan kumpulan-5 yang mempunyai suatu litupan-X11. Didapati bahawa kumpulan-5 mempunyai litupan-X11 jika dan hanya jika ia berisomorfisma dengan beberapan kumpulan abelan bagi sesetengah peringkat.  

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