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rfloc

I'm a math student at a Brazilian university.

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3 What is a positively oriented Jordan curve? Sep 14 '19
3 How to define rigorously the category of all functors? Mar 20 '20
3 How to interpret this definition of adjoint functors? Mar 20 '20
3 Catalog of Categories May 22 '20
2 Prove that $\rho (\cup_{n\in\mathbb{N}}A_n)=\sum_{n\in\mathbb{N}}\rho (A_n)$ Jun 7 '20
2 Introduction to Category Theory Jun 22 '19
2 Any set can be easily replaced by a base set with the same size Jul 5 '19
2 How do I determine whether or not an isomorphism $T:V\to W$ is a canonical isomorphism? May 10 '20
1 Prove that if $x_0\in X\setminus C$, then exists a linear transformation $f:X\to\mathbb{R}$ such that $(\forall x\in C)\left(f(x)\leq f(x_0)\right)$ Sep 12 '19
1 How can I show that for all $v\in V$ there's $F\in V^{**} $ such that $F(f)=f(v)$ for all $f\in V^*$? Jan 5
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