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 Jan28 revised Prove that $\mathbb{Z}$ is a closed subset of $\mathbb{R}$ edited body Jan7 revised Predicates and Quantifiers in discrete math edited tags Jan4 revised Maximizing volume in Calculus improved formatting Jan4 revised How is this a counter example to “ $A$ and $B$ are isomorphic but $G/A \ncong G/B”$? improved version Jan3 revised $0$ and $p^n \mathbb{Z}_p$ are the only ideals of $\mathbb{Z}_p$ edited body Jan3 revised $0$ and $p^n \mathbb{Z}_p$ are the only ideals of $\mathbb{Z}_p$ added 8 characters in body Jan3 revised Inversible Antisymmetric Matrix added 21 characters in body; edited tags Jan3 revised System of vectors $\{f_1, f_2, \ldots, f_n\} \in V^*$ is a basis of $V^*$ if and only if $\ker f_1 \cap \ker f_2 …\cap \ker f_n = \{0\}$ formatting Jan2 revised double angle condition added 41 characters in body Jan2 revised Does order of qualifiers matter in FOL formula? added 48 characters in body Jan2 revised Integral $\int_0^\infty \frac{\sqrt[3]{x+1} - \sqrt[3]{x}}{\sqrt{x}} \, \mathrm dx$ added 43 characters in body Jan2 revised Poincaré inequality by capacity estimate. added 80 characters in body; edited title Jan2 revised Construct an injective function that takes a function $\mathbb{N} \to \mathbb{R}$ and outputs an injective function $\mathbb{N} \to \mathbb{R}$ edited body Jan2 revised Does order of qualifiers matter in FOL formula? added 126 characters in body Jan2 revised Find the cardinality of $\mathbb{F}_2$ adjoin a root of $X^4 + X + 1$ added 42 characters in body; edited tags Jan1 revised Integrate $\int {1\over x^2(x-1)^3} \, dx$ added 204 characters in body Jan1 revised Understanding a “matrix repræsentation” edited body Jan1 revised A simple proof that $\bigl(1+\frac1n\bigr)^n\leq3-\frac1n$? deleted 49 characters in body Jan1 revised A simple proof that $\bigl(1+\frac1n\bigr)^n\leq3-\frac1n$? added 2 characters in body Jan1 revised Diagonalization versus s.d. product for non-commuting Hermitian matrices added 112 characters in body; edited tags