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isCM -- whether a ring or module is Cohen-Macaulay

www.math.uiuc.edu/Macaulay2/doc/...1.../_is__C__M.htmlCachedShare

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i1 : A = ZZ/2[x,y,z];. i2 : isCM(A) o2 = true. i3 : A = ZZ/2[x,y]/(x^2,x*y);. i4 : isCM(A) o4 = false. i5 : A = ZZ/101[a_1,a_2,b_1,b_2,c_1]/ideal(a_1*b_1,a_2*b_2 ...