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76
Why is $\sum_{i=1}^n a$ always irrational if $n>0$ and $a$ is irrational?
math.stackexchange.com

63
Insert a blank page after current page
tex.stackexchange.com

40
Numbering \subsubsection in report class
tex.stackexchange.com

17
Aside from the Pyramids, what is the tallest man-made structure still standing in Europe & the Near East from ancient times?
history.stackexchange.com

15
Forcing a figure strictly on a separate page
tex.stackexchange.com

13
Solution to the equation of a polynomial raised to the power of a polynomial.
math.stackexchange.com

13
Three vectors are coplanar then they are linearly dependent. Is it true for the bottom?
math.stackexchange.com

11
Single .tex file, multiple .bib files
tex.stackexchange.com

9
biblatex: is it possible to combine two styles?
tex.stackexchange.com

9
Why is this definition of convergence incorrect?
math.stackexchange.com

8
How to solve an equation with $x^4$?
math.stackexchange.com

8
How do authors make their problems/exercises for their math books?
math.stackexchange.com

8
Show that four points are coplanar
math.stackexchange.com

7
Is $4 \times 6$ defined as $4 + 4 + 4 + 4 + 4 + 4$ or $6 + 6 + 6 + 6$?
math.stackexchange.com

7
Makeindex - Styling the \printindex?
tex.stackexchange.com

7
If $a,b$ are positive rational numbers and $\sqrt a+\sqrt b$ is rational, then both of $\sqrt a,\sqrt b$ are rational numbers
math.stackexchange.com

6
What technologies could an every-man teach a Palaeolithic tribe?
worldbuilding.stackexchange.com

6
Can I own a French registered car as a non-resident?
travel.stackexchange.com

6
Difference between \footcite and \cite in BibLaTeX
tex.stackexchange.com

6
Automatically look up arXiv reference information
tex.stackexchange.com

6
Explanation of method for showing that $\frac{0}{0}$ is undefined
math.stackexchange.com

6
diagonalizable matrix such that sum of every column is the same number
math.stackexchange.com

6
Possible mistake in Royden and Fitzpatrick's book Real Analysis
math.stackexchange.com

5
Proof that inverse of a matrix is unique
math.stackexchange.com

5
Derivative of an inverse
math.stackexchange.com

5
If two real polynomials $f(x)$ and $g(x)$ of degrees $m \geq 2$ and $n \geq 1$ satisfy $f(x^2+1)=f(x) g(x) ~~\forall~~x \in \mathbb R, $ then :
math.stackexchange.com

5
Trigonometric equation, missing some solutions
math.stackexchange.com

5
find x+y if $ (x+\sqrt{x^2+1})(y+\sqrt{y^2+1})=42 $?
math.stackexchange.com

5
Right or left? When the teacher says: “If you look at the diagram on the left hand side, you will solve this question!”(In a position like this?)
ell.stackexchange.com

5
Stealth camping in France
travel.stackexchange.com