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Mariano

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162
How can adding an infinite number of rationals yield an irrational number?
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72
What's a proof that the angles of a triangle add up to 180°?
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72
Pressing Enter in comment box unexpectedly submits form
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56
Why do mathematicians use single-letter variables?
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51
Why is 'abuse of notation' tolerated?
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47
Proving the identity $\sum\limits_{k=1}^n {k^3} = \left(\sum\limits_{k=1}^n k\right)^2$ without induction
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31
If $A$ is singular, is $A^3+A^2+A$ singular?
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25
Functions that are their Own nth Derivatives for Real n
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23
Importance of Representation Theory
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23
Why is $\omega$ the smallest $\infty$?
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22
Why does drawing $\square$ mean the end of a proof?
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21
Solutions to the matrix equation $\mathbf{AB-BA=I}$ over general fields
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20
Cohomology of projective plane
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20
Getting the sequence $1, 0, -1, 0, 1, 0, -1, 0, \ldots$ without trig?
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20
Why is associativity required for groups?
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19
Chain Rule Intuition
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19
Compute $\int \frac{\sin(x)}{\sin(x)+\cos(x)}\mathrm dx$
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18
Why is the Jordan Curve Theorem not “obvious”?
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17
Index of a maximal subgroup in a finite group
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17
If $G$ is abelian, then the set of all $g \in G$ such that $g = g^{-1}$ is a subgroup of $G$
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16
“Why do I always get 1 when I keep hitting the square root button on my calculator?”
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15
Fundamental group of GL(n,C) is isomorphic to Z. How to learn to prove facts like this?
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15
Does uncountable summation, with a finite sum, ever occur in mathematics?
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14
Motivation for Tensor Product
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14
Is $dy/dx$ not a ratio?
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14
Elegant proof that $L^2([a,b])$ is separable
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14
What does $\ll$ mean?
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14
Isomorphic quotient groups
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14
Alternative definition of the determinant of a square matrix and its advantages?
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14
Defining a manifold without reference to the reals
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