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111
Has lack of mathematical rigour killed anybody before?
math.stackexchange.com

87
What are some examples of notation that really improved mathematics?
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83
An Explanation of the Kalman Filter
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62
Why is $\sin(d\Phi) = d\Phi$ where $d\Phi$ is very small?
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54
Finding $\int x^xdx$
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35
What is the real life use of hyperbola?
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35
Deep theorem with trivial proof
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34
Possibly quit your job with a polyglot
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29
Prove that $A+I$ is invertible if $A$ is nilpotent
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26
Why are the first few powers of $2^{10}$ a little more than those of 1000?
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24
How do we know that we found all solutions of a differential equation?
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23
What would Gauss do in this case: adding $1+\frac12+\frac13+\frac14+ \dots +\frac1{100}$?
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23
What exactly are fractals
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22
Approximating $100!$
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22
Show that $z^6 + 5z^4 - z^3 + 3z$ has at least two real roots given that all roots are distinct.
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21
Is there an identity that links $\pi$ and $\phi$ (the golden ratio)?
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19
What's the mean of all real numbers?
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18
Very *mathematical* general physics book
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18
Determine where a point lies in relation to a circle, is my answer right?
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17
Value of Summation of $\log(n)$
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16
A series involving the harmonic numbers : $\sum_{n=1}^{\infty}\frac{H_n}{n^3}$
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16
Integer solutions of the equation $x^2+y^2+z^2 = 2xyz$
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15
If a lottery has 300 tickets, shouldn't I win every 300 times I play
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15
Why is congruence sign $A\equiv B\pmod{C}$?
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15
$2^{50} < 3^{32}$ using elementary number theory
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14
How to write a C program for multiplication without using the * and + operators?
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14
What does it mean to divide a complex number by another complex number?
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14
Why isn't math on the sine of angles the same as math on the angles in degrees?
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13
How to prove that: $19.999<e^\pi-\pi<20$?
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13
Fourier Series $\sin(\sin(x))$
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