### Questions (19)

 7 The group $\mathbb{Z}^\mathbb{N}/\mathbb{Z}^{(\mathbb{N})}$ can't be embedded in a product $\mathbb{Z}^A$ for any $A$ 5 Linear isometry between $c_0$ and $c$ 5 Every curve in $\mathbb{A}^3$ is the zero-locus of $3$ polynomials 4 'Continued roots'' [duplicate] 4 If $\operatorname{rk}(A) = 1$, when $B + A$ is invertible?

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 51 Funny identities 14 Contradiction! Any Symbol for? 7 How to prove that if convex $A \subset \mathbb{R}^n$ and $A+A=A$ then $0 \in cl(A)$? 6 Finding limit of a function ($0$ appears in denominator) 4 If $\sum_{n}A_n$ is convergent, then $\sum_{n} (-1)^{n} A_n$ is also convergent?

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### Bookmarks (15)

 422 Proofs that every mathematician should know. [closed] 216 What books must every math undergraduate read? 104 Different ways to prove there are infinitely many primes? 55 Is $1+x+\frac{x^2}2+\dots+\frac{x^n}{n!}$ irreducible? 37 Slick proof the determinant is an irreducible polynomial