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btilly's user avatar
btilly's user avatar
btilly
  • Member for 13 years, 2 months
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5 votes
Accepted

Number of distinct arrangements {$n_i$} $n_1<n_2<n_3<n_4<n_5$ such that $\sum n_i=20$

4 votes
Accepted

Is A a proper set of its power set?

4 votes

If $b \cdot a = c\cdot a$ for equal-sized non-zero vectors $a, b, c$, does it follow that $c = b$?

3 votes
Accepted

How much of calculus can we formalize without infinity?

3 votes

$F \subset \mathbb{R}$ is closed. Prove there exists a countable $E \subset F$, where $\bar{E} = F$.

3 votes

The space of pairs of intersecting line segments in $\mathbb{R}^2$ is open or closed?

2 votes

Differing Calculations? Entropy of ONE Alphabet $= 4.7$ or $0.18$?

2 votes

Giving a sequential proof of the Heine-Borel theorem

2 votes
Accepted

Algorithm for computing algebraic numbers? (Why are algebraic numbers computable?)

2 votes

Is it possible to solve this equation system (containing summations)?

2 votes
Accepted

Recurrence relation - "order matters" clause

2 votes
Accepted

Limit of indeteminate form $1^{(∞)}$

2 votes
Accepted

Number of Solutions for $p^2 - q^2$ = n?

2 votes

Prove that the $n-sphere$ is a manifold

2 votes

Disproving sequential compactness

2 votes

Rate of convergence of summable sequence

2 votes

The Lebesgue Fundamental Theorem of Calculus

2 votes

Taylor of second order for System of Differential Equations

2 votes

Arithmetic sequence whose any five consecutive elements contain a prime

1 vote

Left and right derivative of composition

1 vote
Accepted

Adding relations to a partial order

1 vote

Strongly convex set is contractible

1 vote

Proof that the sets $(-m,m)$ for $m \in N$ form an open cover of R with no finite subcover

1 vote
Accepted

Find the matrix associated to linear function.

1 vote

Changing summation in a power series

1 vote

Why does addition not make sense on infinite vectors?

1 vote

Spivak's Chain Rule Proof (Image of proof provided)

1 vote

Would the Continuous Limit Theorem still work if we change "uniform convergence" to "pointwise convergence"?

1 vote

Generalization of a common die-rolling game; looking for a limit

1 vote

Well Ordering Principle, Zorn's Lemma, Induction, etc.