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Jay
  • Member for 11 years, 4 months
  • Last seen this week
  • Minneapolis, MN
28 votes
Accepted

How can I prove that one of $n$, $n+2$, and $n+4$ must be divisible by three, for any $n\in\mathbb{N}$

14 votes

Is there any conjecture that has been proved to be solvable/provable but whose direct solution/proof is not yet known?

9 votes
Accepted

Complete lattices and sublattices – which requirement is more stringent?

8 votes

Showing that a set X with a trivial topology is not metrizable

8 votes

Why is 'abuse of notation' tolerated?

7 votes

Show: $\mathbb{C}=\overline{\mathbb{C}\setminus\left\{0\right\}}$

7 votes

How to understand why $x^0 = 1$, where $x$ is any real number?

7 votes

Is the box topology good for anything?

7 votes

Is there a Non-prime Number that is Divisible only by Numbers Greater than its Square Root?

5 votes
Accepted

Does anyone know of any good ways to get good at algebra without as much"grind" as doing hundreds of questions a night

5 votes
Accepted

If all the vectors of a basis of a vector space are contained in another space, is the first space a subspace of the second?

5 votes

How it is posible that $\omega$-inconsistency does not lead to inconsistency

5 votes

Example of a conjecture/theorem which required an entirely new idea to prove

5 votes
Accepted

What underlies formal logic (or math, generally)?

5 votes

Is Scrabble's method of determining turn order fair?

5 votes

Possibility of getting odd pair socks

4 votes
Accepted

Subset Relation: Is the subset relation a partial order?

4 votes
Accepted

Theorems which are proven by proving the existence of a formal proof without knowing the formal proof

4 votes

Direct proof set theory.

4 votes

Concept of set without concept of member?

4 votes
Accepted

Why are convex sets assumed / defined to be subsets of vector spaces (and not of more general spaces)?

4 votes
Accepted

Books and Papers that have treatment of properties like Idempotence and related operations

4 votes

Bad Fraction Reduction That Actually Works

3 votes

Two posets and a function

3 votes

Upper limit of summation index lower than lower limit?

3 votes

Generate the smallest $\sigma$-algebra containing a given family of sets

3 votes
Accepted

If G is a finite group and $x \in G$, there is an integer n $\geq 1$ such that $x^n = e$

3 votes

Is the set of proposition symbols necessarily a countable set?

3 votes
Accepted

Can you make a Sine wave with a straight edge and compass?

2 votes
Accepted

POSET as a disjoint union of a well ordered set and a set with no least element

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