A First Course in Abstract Algebra introduces groups and commutative rings.
Group theory was invented by E. Galois in the early 1800s, when he used groups
to completely determine when the roots of polynomials can be found by formulas
generalizing the quadratic formula.
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Linear+Algebra+and+Its+Applications.pdf
原版书。
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线性代数 高清教材 第九版 Linear Algebra with Applications 9th by Leon Steven
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