Exercise 4.4 in Atiyah & Macdonald
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Ideal products and calculating with ideals
52083
Vandermonde determinant for order 4
50266
In the following figure prove that: $AK||BC$
37249
Suppose $A$ is a 4x4 matrix such that $\det(A)=\frac{1}{64}$
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$\operatorname{adj}(AB) = \operatorname{adj} B \operatorname{adj} A$
7865
Complete Newbie: Axiom of Foundation Exercise
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Atiyah Macdonald Exercise 5.22
125474
Exercise 16 from chapter 3 of Stein & Shakarchi's complex analysis
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Contraction of Kronecker delta = 4
130464
Exercise 2.11 Atiyah-Macdonald
44453
Prove that the normalisation of $A=k[X,Y]/(Y^2-X^2-X^3)$ is $k[t]$ where $t=Y/X$ (Reid, Exercise 4.5)
148139
Exercise $1.8$ of chapter one in Hartshorne.
74611
$\operatorname{Adj} (\mathbf I_n x-\mathbf A)$ when $\operatorname{rank}(\mathbf A)\le n-2$
4996
Proving $Gal(K/\mathbb{Q})$ is $D_4$.
64168
Problem 4.6, I. Martin Isaacs' Character Theory
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bilinear form - proof
87946
Proving that the unities of a ring form a group under multiplication