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Eleftheria Chatziargyriou's user avatar
Eleftheria Chatziargyriou's user avatar
Eleftheria Chatziargyriou's user avatar
Eleftheria Chatziargyriou
  • Member for 8 years
  • Last seen more than a month ago
6 votes

How to write a set with an index

5 votes

How do I note two vectors at once?

4 votes

Prove that if $2a^3 + 27c = 9ab,$ then the roots of $x^3 + ax^2 + bx + c = 0$ form an arithmetic sequence.

3 votes

Show that the real part of complex number is $-1$

3 votes
Accepted

Prove: the empty set $\emptyset$ and $\mathbb{R}$ are closed.

3 votes
Accepted

Three unit vectors whose sum is zero

3 votes
Accepted

What's the greatest common divisor of $\phi(n)$ and $n$, where $\phi(n)$ is the Euler Totient Function?

2 votes

What happens when you add $x$ to $\frac{1}{3}x$?

2 votes

Prove: $||x|-|y||\leq |x+y|$

2 votes
Accepted

A non-abelian group of order $6$ is isomorphic to $\mathcal{S}_3$.

2 votes

How to compute Trigonometric functions based on Inverse Square Root

2 votes

Geometric definition of the dot product in $n$-dimensional vector spaces

2 votes
Accepted

Number of four-digit numbers with nonzero leading digit in two ways

1 vote

Interpret Integral as probability

1 vote

What’s wrong with this proof that the set of natural numbers is uncountable?

1 vote

Inequalities giving lower bound on variance

1 vote
Accepted

If 2 dice are rolled what is probability that "product of given values of dices is > 10" | "given the result is a double"

1 vote

How to form a generator and parity-check matrix given the code

1 vote
Accepted

Fitting a line through intercept 0

1 vote

On complex vector spaces

1 vote

A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?

1 vote

Intuition for Gram-Schmidt process

1 vote
Accepted

Riez representation theorem proof explanation

1 vote

What is E(|0.5-X|) when X ~ B(2, 2)?

1 vote
Accepted

how to compute conditional expectation in markov chain

1 vote

nonorthogonal diagonalization and quadratic forms

1 vote

Probability Of Being The Only User Logged Into a Computer

0 votes
Accepted

Quadratic form property

0 votes

Find an orthonormal base of $\mathbb{R}^2$

0 votes

Bivariate moment generating function