Why the linear numerator for fractions with irreducible denominators and constant numerators for reducible denominators?
100504
Why a linear numerator for fractions with irreducible denominators?
26069
Why is $X^4-16X^2+4$ irreducible in $\mathbb{Q}[X]$?
64941
Why is $1 - \frac{1}{1 - \frac{1}{1 - \ldots}}$ not real?
14193
How is division symbol usage currently defined?
40534
What is $(-1)^{\frac{2}{3}}$?
33896
How does partial fraction decomposition avoid division by zero?
124136
Why does the division algorithm work for converting between number bases?
4443
Why is the determinant zero iff the column vectors are linearly dependent?
113431
Why does reduction of order work for linear ODEs?
33184
Something strange about $\sqrt{ 4+ \sqrt{ 4 + \sqrt{ 4-x}}}=x$ and its friends
116881
Why is a linear transformation called linear?
132572
Why this polynomial is irreducible?
29739
How can $\frac{x^3-4x^2+4x}{x^2-4}$ be both $0$ and "undefined" when $x = 2$?
41926
Why do we say "lowest common denominator" when we mean "greatest common divisor"?
75503
Rationalizing a Denominator with Cube Roots
21121
Express $w$ and $1/w$ for $w=\frac {\sqrt2+\sqrt3}{\sqrt5-\sqrt3}$ in the simplest form with a rational denominator
23701
I have a problem understanding the proof of Rencontres numbers (Derangements)