Hartshorne Proposition II.6.6
39755
In a faithfully flat ring extension, is $\operatorname{ht}I=\operatorname{ht}IS$ right?
96071
How to show that a prime ideal of height 2 can’t necessarily be generated by 2 elements? (Hartshorne exercise I.1.11)
90195
Cech cohomology (Harthshorne)
118612
Neutral element in $\hom_C(A, B)$
108767
Irreducible Components of the Prime Spectrum of a Quotient Ring and Primary Decomposition
74734
(Enderton set theory) Hartog's theorem and cardinal numbers
88304
Center of $D_6$ is $\mathbb{Z}_2$
60858
An abelian group of order 6 has an element of order 6.
11000
Fundamental group of $\mathbb{R}^2 \setminus (\mathbb{Z} \times \{0\})$
114193
On the absolute norm of an ideal
62917
Associated Prime Ideals in a Noetherian Ring; Exercise 6.4 in Matsumura
107435
Exercise from Atiyah-Macdonald, Chapter 1, 2.iv)
27704
Cardinality of quotient ring $\mathbb{Z_6}[X]/(2X+4)$
124646
Understanding the ideal $IJ$ in $R$
69166
Cardinality of $\mathbb{R}$ and $\mathbb{R}^2$
80788
Cech Cohomology Hartshorne III 4.4
98284
show $\Bbb Z_6 \cong \Bbb Z_3 \times \Bbb Z_2 $.