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arXiv 2112.04464math.ACmath.AGmath.CO
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什么时候对称理想是单项的?

When are symmetric ideals monomial?

Andreas Kretschmer

摘要:

研究了多项式在对称群作用下的轨道所生成的理想成为单项理想或具有单项根的条件。如果多项式是齐次的,我们期望这样一个理想有单项式根,如果它们的系数关于它们的支集是足够一般的。我们证明了这一点,例如在一些发电机包含一个变量的权力的情况下。此外,如果多项式只有无平方项并且它们的系数之和不为零,那么在更大的多项式环中,理想本身就是无平方项单项。这对无限多项式环的对称理想也有影响。

英文摘要:

We study conditions on polynomials such that the ideal generated by their orbits under the symmetric group action becomes a monomial ideal or has a monomial radical. If the polynomials are homogeneous, we expect that such an ideal has a monomial radical if their coefficients are sufficiently general with respect to their supports. We prove this for instance in the case where some generator contains a power of a variable. Moreover, if the polynomials have only square-free terms and their coefficients do not sum to zero, then in a larger polynomial ring the ideal itself is square-free monomial. This has implications also for symmetric ideals of the infinite polynomial ring.

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