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Salvo Tringali's user avatar
Salvo Tringali's user avatar
Salvo Tringali's user avatar
Salvo Tringali
  • Member for 12 years, 6 months
  • Last seen this week
  • Shijiazhuang, Hebei, China
10 votes
Accepted

Proof skew-symmetric matrix $A$ exhibits $\vec{x}^T A \vec{x} = 0$

5 votes
Accepted

Is there a name for this identity involving series?

3 votes
Accepted

Seeking a good quality reference for "lifting the exponent"

2 votes
Accepted

Prove or disprove an equation about Euler's $\phi$ function

1 vote
Accepted

Non-additive upper logarithmic density: $\ell^\star(X \cup Y) \neq \ell^\star(X)+\ell^\star(Y)$

1 vote
Accepted

Does Darboux property imply strong Darboux property?

1 vote

Does Darboux property imply strong Darboux property?

1 vote
Accepted

Finding an orthogonal basis for an inner product space $\mathbf{P}_2$

0 votes
Accepted

$eR = \mathfrak i_1 \oplus \mathfrak i_2$, with $e^2 = e$, iff $e = e_1+e_2$ for some orthogonal idempotents $e_i$

0 votes

What can we learn about a group by studying its monoid of subsets?

0 votes

Non-empty intersection between a compact and an unbounded connected subset of $\mathbb{R}^d$