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Rodrigo de Azevedo

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

72
Why are some coins Reuleaux triangles?
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41
The relation between trace and determinant of a matrix
math.stackexchange.com

30
How to prove that a $3 \times 3$ Magic Square must have $5$ in its middle cell?
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28
What is a real-world metaphor for irrational numbers?
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19
Systems of linear equations: Why does no one plug back in?
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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
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13
Approximation to unsolvable system of equations
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13
Suppose $M$ is an $m \times n$ matrix such that all rows and columns of $M$ sum to $1$. Show that $m=n$
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13
Derivative of squared Frobenius norm of a matrix
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12
Is $f(x,y) = f(\mathbf{x})$ abuse of notation?
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12
Can a bimolecular chemical equation be solved analytically?
chemistry.stackexchange.com

11
Find large power of a non-diagonalisable matrix
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11
Filling $4 \times 4$ matrix with Boolean values
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11
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
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10
What are the possible concentration pathways for a 3-species system?
chemistry.stackexchange.com

10
Establishing authority in the classroom
academia.stackexchange.com

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

9
Eigenvalues of a matrix with repeating pattern of entries
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9
Decomposing a matrix into a product of sparse matrices
mathoverflow.net

9
Is it possible to have three real numbers that have both their sum and product equal to $1$?
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9
Decomposition of a positive semidefinite matrix
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8
Find the determinant of $I + A$
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8
For which classes of matrix can the matrix exponential be easily computed?
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8
What is the derivative of $f (\mathrm X) = \mathrm X^3$?
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8
Spectral norm minimization via semidefinite programming
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8
Why is it not possible to generate an explicit formula for Newton's method?
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