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Serge Ballesta's user avatar
Serge Ballesta's user avatar
Serge Ballesta's user avatar
Serge Ballesta
  • Member for 9 years, 5 months
  • Last seen this week
  • Bordeaux, France
9 votes

What is the advantage of measuring an angle in radian(s)?

7 votes

Which definition of "power" is true: Britannica's or Wikipedia's?

6 votes

Can a complex number ever be considered 'bigger' or 'smaller' than a real number, or vice versa?

5 votes
Accepted

$n^2-2^m = 1$, cant find the answer

4 votes

What's wrong with this limit solution?

4 votes

$\emptyset \in \emptyset$ Is this right?

3 votes

Finding $f'(0)$ for $f(x) = x^{1/3} - x^{1/5}$

3 votes
Accepted

Let $p(x) = x^4+ax^3+bx^2+cx+d$, where $a,b,c, d$ are integers. The sum of the pair of roots are given by $1,2,5,6,9, 10$. find $p(\frac{1}{2})$.

3 votes

Why are turns not used as the default angle measure?

3 votes

Are all numbers rational?

2 votes

Are there linear transformations from vector spaces over different fields?

2 votes
Accepted

Let $f : \Bbb R → \Bbb R$ be a linear map. Prove that there is a constant $a ∈ \Bbb R$ such that $f(x) = a x$.

2 votes

Is $\int_{-\infty}^{\infty} xf(x) \, \mathrm{d}x=0$ when $f$ is an even function?

2 votes
Accepted

Prove $x^{\frac{p}{q}}$ is well-defined when $x < 0$ and $q$ is odd.

2 votes
Accepted

Partial derivative of $f(x,y(x))$

2 votes

How to prove that the density function integrates to 1 over the whole support?

2 votes

Is this possible to have these couple of dice?

1 vote

Calculating custom coordinates

1 vote

If L=$\lim_{x\to 0} \frac{x-\sin(x)}{x^3}$ show that L=1/6

1 vote
Accepted

Problem Help in Studying for Final.

1 vote

Is a function a set or a rule?

1 vote
Accepted

What does this notation mean$ p_1 \ldots \frac{x-1}{2}=\frac{y+1}{-1}=\frac{z-4}{1}, \quad p_2 \ldots \frac{x-5}{2}=\frac{y-1}{-1}=\frac{z-2}{1} . $

1 vote

Need to find the horizontal asymptotes of a given expression.

1 vote

Can a function be defined as the union of two other functions?

1 vote
Accepted

Prove that $x/y$ < $(x+3)/(y-3)$ obeys the condition $-x<y$ only for y<0

1 vote

My question is whether given function is periodic or not

1 vote

Cardinal of the family of all finite subsets of rational numbers contained in [0,1]

1 vote

Does the set ${\displaystyle A =\{q\in \mathbb {Q} |q<a\}} $ have a maximum element?

1 vote
Accepted

Linear dependency and eigenvalues

1 vote
Accepted

A question about finite integrals in measure spaces