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Stack Exchange

Rodrigo de Azevedo

Europe

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Top Questions
Top Answers
73
Is “The empty set is a subset of any set” a convention?
math.stackexchange.com

72
Why are some coins Reuleaux triangles?
math.stackexchange.com

40
The relation between trace and determinant of a matrix
math.stackexchange.com

28
What is a real-world metaphor for irrational numbers?
math.stackexchange.com

27
How to prove that a $3 \times 3$ Magic Square must have $5$ in its middle cell?
math.stackexchange.com

19
Systems of linear equations: Why does no one plug back in?
math.stackexchange.com

19
Are two sequences equal if the sums and sums of squares are equal?
math.stackexchange.com

16
Are there any issues with speaking Spanish as a tourist in Portugal?
travel.stackexchange.com

15
Can a helicopter carry a large airplane?
aviation.stackexchange.com

15
Math without pencil and paper
math.stackexchange.com

13
Approximation to unsolvable system of equations
math.stackexchange.com

12
Suppose $M$ is an $m \times n$ matrix such that all rows and columns of $M$ sum to $1$. Show that $m=n$
math.stackexchange.com

12
Is $f(x,y) = f(\mathbf{x})$ abuse of notation?
math.stackexchange.com

12
Derivative of squared Frobenius norm of a matrix
math.stackexchange.com

12
Can a bimolecular chemical equation be solved analytically?
chemistry.stackexchange.com

11
Filling $4 \times 4$ matrix with Boolean values
math.stackexchange.com

11
Find large power of a non-diagonalisable matrix
math.stackexchange.com

10
Write $(x^2 + y^2 + z^2)^2 - 3 ( x^3 y + y^3 z + z^3 x)$ as a sum of (three) squares of quadratic forms
math.stackexchange.com

10
Determinant of a $k \times k$ block matrix
mathoverflow.net

10
Establishing authority in the classroom
academia.stackexchange.com

10
What are the possible concentration pathways for a 3-species system?
chemistry.stackexchange.com

9
Decomposing a matrix into a product of sparse matrices
mathoverflow.net

9
Eigenvalues of a matrix with repeating pattern of entries
math.stackexchange.com

9
Is it possible to have three real numbers that have both their sum and product equal to $1$?
math.stackexchange.com

9
Decomposition of a positive semidefinite matrix
math.stackexchange.com

8
Find the determinant of $I + A$
math.stackexchange.com

8
For which classes of matrix can the matrix exponential be easily computed?
math.stackexchange.com

8
What is the derivative of $f (\mathrm X) = \mathrm X^3$?
math.stackexchange.com

8
Spectral norm minimization via semidefinite programming
math.stackexchange.com

8
Chemical oscillators that behave like a double pendulum
chemistry.stackexchange.com

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