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Polichinelle
  • Member for 10 years, 8 months
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20 votes
Accepted

“$ x $ is a brother of $ y $.” Why is this not transitive?

9 votes
Accepted

Power towers of $2$ and $3$ - looking for a proof

7 votes

proof relating to limit definition of e

7 votes
Accepted

Real equivalent of the surreal number {0.5|}

6 votes
Accepted

if $|f(n+1)-f(n)|\leq 2001$, $|g(n+1)-g(n)|\leq 2001$, $|(fg)(n+1)-(fg)(n)|\leq 2001$ then $\min\{f(n),g(n)\}$ is bounded

5 votes
Accepted

Is $\sum_{n = 1}^{\infty} v_p(n) 2^{-n+1}$ a rational number?

5 votes
Accepted

Limit of an exotic sequence

4 votes

Count subsets with zero sum of xors

3 votes

Show that every boolean function with 3 variables can be represented with maximum number of 10 gates

3 votes
Accepted

Cyclic type of the product of two permutations

3 votes
Accepted

How is arithmetic overflow avoided by using the Dawson function over the erfi function?

3 votes
Accepted

Can the sum of reciprocals of a set without density converge?

3 votes
Accepted

Examples of an unbounded measurable subset of finite measure of the p-adic number field

2 votes

Evaluate the following limit of finite sum

2 votes
Accepted

Question about $[K:F]=[K:E][E:F]$ for fields $E,F,K$

2 votes
Accepted

Does $K[x]/(p(x))$ contain the splitting field of $p(x)$?

2 votes
Accepted

Show that if $P = NP$, then deciding whether a boolean formula is minimal is in $P$.

2 votes

Show that $\mathbb{F}[x^2,y^2,xy]$ is not polynomial

2 votes
Accepted

Real Life Optimization Problem

2 votes
Accepted

Bound on lcm of denominators of rational numbers that sum to 1.

2 votes
Accepted

Conditional return time of simple random walk

1 vote
Accepted

Certain products of mostly diagonal matrices are nonzero

1 vote

$K^n \cong K^m \implies n = m$

1 vote
Accepted

Is (a^b)/(b^a) greater than 1 for b > a?

1 vote
Accepted

Dimension of union of fields over intersection of fields.

1 vote

periodicity of an exponential sum

1 vote
Accepted

Question concerning the Dirichlet density of a subset of the set of primes

1 vote
Accepted

A limit related to an alternating series

1 vote
Accepted

Understanding a test for divisibility by 9

1 vote

Is this element algebraic over $\mathbb{Q}$?