: Cyclic groups , cosets, Lagrange's Theorem, normal subgroups, and quotient groups.
The book "Abstract Algebra" by Sen, Ghosh, and Mukhopadhyay is widely available online, and can be downloaded in PDF format. Students and researchers can download the PDF from various online sources, including academic databases, online libraries, and bookstores.
Purchasing the physical book or a legitimate e-book version ensures that the academic community can continue to produce high-quality educational resources.
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Advanced chapters introduce the symmetries of root fields, which are crucial for higher-level algebra.