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Hayden
  • Member for 12 years, 1 month
  • Last seen more than a week ago
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  • Boston, MA
10 votes
2 answers
3k views

Infinite Disjunctions and Conjunctions

9 votes
6 answers
4k views

Integral $ \int_{-\infty}^{\infty}\frac{x^{2}}{\cosh\left(x\right)}\,{\rm d}x $

7 votes
1 answer
1k views

Universal Property of Tensor Algebra

7 votes
2 answers
3k views

Recommendation for Order Theory texts

7 votes
1 answer
279 views

Lattice-Theoretic Interpretation of the Fundamental Theorem of Arithmetic

7 votes
0 answers
984 views

"Arbitrary" Products, Unions, and Intersections of Classes

5 votes
1 answer
649 views

Motivation behind Distributive Property

5 votes
1 answer
290 views

Showing epis in $\mathbf{Grp}$ are surjective

5 votes
2 answers
2k views

Equivalence of the definition of Adjoint Functors via Universal Morphisms and Unit-Counit

5 votes
1 answer
278 views

Showing a subcategory of $\mathbf{Top}$ is Cartesian-Closed

4 votes
0 answers
587 views

Final Topology as Colimit

4 votes
3 answers
2k views

Simple & Intuitive Statements that are Difficult to Prove [duplicate]

4 votes
2 answers
234 views

Proving $\vdash \exists x (x=c)$ for each term $c$.

3 votes
1 answer
943 views

Class Group of Ring of Integers of $\mathbb{Q}[\sqrt{-57}]$

3 votes
4 answers
308 views

Representation of functions between residue classes of $\mathbb{Z}/m\mathbb{Z}$ as polynomials

3 votes
1 answer
366 views

Characterization of Linear Transformations between Tensor Products

2 votes
1 answer
314 views

Quotients of the Ordered Square

2 votes
0 answers
44 views

Disjoint Union Topology universal property as instance of final topology's universal property [duplicate]

2 votes
1 answer
368 views

Showing the operation of taking the Composition of Paths is Continuous

2 votes
2 answers
538 views

If an entire function grows slower than a polynomial, then it is a polynomial!

2 votes
2 answers
1k views

Branch Points of $f(z)=\log\left( \frac{1+\sqrt{1+z^2}}{2}\right)$

2 votes
2 answers
343 views

When $R$ is a subring of $R[\alpha]$

2 votes
2 answers
1k views

Winding Number of a product of curves in $\mathbb{C}$

1 vote
1 answer
415 views

Continuity of Multiplication by Fixed Element

1 vote
3 answers
315 views

Proof that $\mathbb{N}\times \mathbb{N}\cong \mathbb{N}$ without $AC_\omega$ or Arithmetic

1 vote
1 answer
316 views

Confusion Regarding the Axiom of Countable Choice

1 vote
1 answer
312 views

Open Star Domains with only Finite set of Centers

1 vote
1 answer
131 views

Reducing Several Identities to One Identity

1 vote
1 answer
257 views

Consistent Set of Sentences is Consistent in Expanded Language

1 vote
1 answer
357 views

Hausdorff Non-First-Countable Quotient Spaces of Ordered Square