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TrostAft
  • Member for 7 years, 1 month
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4 votes

How can I argue that for a number to be divisible by 144 it has to be divisible by 36?

3 votes
Accepted

How does this inequality hold? $|d(x,x_0)-d(y,x_0)|\le d(x,y)$

3 votes
Accepted

Proof that direct product of connected spaces is connected

3 votes
Accepted

What would be the domain of the function $\sqrt{\frac{\log_{0.2}(x-1)}{x^2-2x-8}}$?

2 votes

Is the infimum and supremum the same is greatest lower and least upper bound?

2 votes
Accepted

Show that $(M\times N)/R\cong M$.

1 vote

Showing that $P(a<X_1\leq b,c<X_2\leq d)=F(b,d)+F(a,c)-F(a,d)-F(b,c)$

1 vote
Accepted

Proof verification: $n$ has three discrete prime factors when $ϕ(n) \mid (n−1)$

1 vote
Accepted

Good way to check if an ideal is principal in cubic extensions

1 vote
Accepted

What is the maximum value of (a + k b) mod M?

1 vote
Accepted

Bijectivity of sinx on the interval $[-\pi, \pi]$ to $[-1, 1]$.

1 vote

What books do you recommend I should use as an introduction to convex analysis?

1 vote

Optimal constant for Poincarè inequality

0 votes

An equation of superior degree, with a very high degree. How is it possible to solve it?

0 votes
Accepted

Proving $V(aX+b)=a^2\sigma_x^2$

0 votes

What are the isomorphisms from $\mathbb{Z}$ to itself?

0 votes
Accepted

How do you simplify this expression to show it follows an exponential distribution?

0 votes
Accepted

A QR factorization of a $A - Qe_1 e_1^* R$.

0 votes
Accepted

Physics - Conservation of Energy problem with non earth object

-1 votes
Accepted

Big O notation proof statement

-1 votes

Efficient way to find pairs of multiplicative inverses