Computations in Commutative algebra (CoCoA) is another free computer algebra system for working with very large integers, rational Numbers, and polynomials.
Computations in Commutative Algebra (CoCoA)是另一个免费计算机代数系统，用于处理超大型整数、有理数和多项式。
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The immersed subbundles of free bundles and the immersed free subbundles of any module bundles are constructed, by using theoretics of tensor and module algebra.