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Apr
15
reviewed Looks OK Representing every positive rational number in the form of $(a^n+b^n)/(c^n+d^n)$
Apr
15
comment Representing every positive rational number in the form of $(a^n+b^n)/(c^n+d^n)$
Could you explain where the 5 and 30 come from?
Apr
15
reviewed Reopen Number of circuits that surround the square.
Apr
15
reviewed Close Are intersection of power set and power set of intersection equal?
Apr
15
reviewed Close What are some good problem solving techniques for Math Olympiad style tests?
Apr
2
reviewed Close StackEgg optimal algorithm
Apr
2
reviewed Leave Open How can I find the closed form of this recursive relationship: $a_{n}=(a_{n-1})^2+a_{n-1},a_{0}=1$
Apr
2
comment How can I find the closed form of this recursive relationship: $a_{n}=(a_{n-1})^2+a_{n-1},a_{0}=1$
Knuth's comment in OEIS that "Using the methods of Aho and Sloane, Fibonacci Quarterly 11 (1973), 429-437, it is easy to show that $a_n$ is the integer just a tiny bit below the real number $\theta^{2^n}-\frac12$, where $\theta \approx 1.597910218$ is the exponential of the rapidly convergent series $\ln\frac32+\sum_{n \ge 0} \ln(1+(2a_n+1)^{-2})$" gives you a starting point.
Apr
2
reviewed Close Is the difference of two decreasing functions also decreasing?
Apr
2
reviewed Leave Open Prob. on Technique Of Counting
Apr
1
reviewed Close Nonsigular curve of degree $3$ in $\mathbb P^2$ over a field of characteristic $3$
Apr
1
reviewed Leave Open Probability of exactly k out of n events occuring
Apr
1
reviewed Close “If a group $G$ is cyclic, then it has no proper subgroups.” True or false?
Apr
1
reviewed Close Negative integers congruent modulo m
Apr
1
reviewed Leave Open Parametric representation of a plane cut of a sphere at y=5
Mar
31
reviewed Leave Open Relation between Hermite polynomials and Brownian motion (on martingale property)
Mar
31
reviewed Close $n^3 + n^2 + n + 1 = m^2$ for positive integers $m$ and $n.$
Mar
31
reviewed Close Bijection between natural numbers $\mathbb{N}$ and natural plane $\mathbb{N} \times \mathbb{N}$
Mar
31
reviewed Close What is $T>0$ large enough such that $\mu\left(B\right)<\varepsilon$?
Mar
31
reviewed Leave Open Show that there are only finitely many subgroups of $F$ in which $H$ can be of finite index.