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2d
answered Rearranging to quadratic equation
2d
comment Rational Expression Simplification
mathworld.wolfram.com/PartialFractionDecomposition.html
2d
comment Reduced residue system
$$\{a, 1\le a<2^m, (a,2)=1\}$$
2d
comment Calculus Limits Problem
@TBX, all well that ends well :)
2d
comment Calculus Limits Problem
@TBX, Sorry I could not read the question properly
2d
revised Calculus Limits Problem
deleted 37 characters in body
2d
comment Calculus Limits Problem
@TBX, Please confirm the edited version of the answer and pinpoint your line of confusion
2d
reviewed Approve suggested edit on Calculus Limits Problem
2d
answered Calculus Limits Problem
2d
comment Proving $\lim_{n \rightarrow \infty} \frac{\sum_{r=1}^{n} r^a}{n^{a+1}}=\frac{1}{a+1}$
Related : math.stackexchange.com/questions/478344/… and math.stackexchange.com/questions/469885/…
2d
answered Proving $\lim_{n \rightarrow \infty} \frac{\sum_{r=1}^{n} r^a}{n^{a+1}}=\frac{1}{a+1}$
2d
answered Formula for the floor of $n/2$, to be proved by induction
2d
comment Number theoretic proof that $n\mid\phi(a^n-1)$
math.stackexchange.com/questions/398165/…
2d
comment Computing an indefinite integral
$$\lim_{n\to\infty}P_n(x)=e^x$$
Sep
13
answered Range of inverse trigonometric function
Sep
13
comment Can a complex number have two arguments
$$[-\pi,0)\equiv[\pi,2\pi)\pmod{2\pi}$$
Sep
13
comment Can a complex number have two arguments
What you have wrongly written as $$\tan\sqrt3,$$ is actually $$\arctan\sqrt3=\tan^{-1}(\sqrt3)$$
Sep
13
comment Can a complex number have two arguments
No argument if unique , see en.wikipedia.org/wiki/Atan2#Definition_and_computation
Sep
13
comment Solve the equation $a+b+c=abc$ for $a,b,c\in\mathbb{Z}$
math.stackexchange.com/questions/613105/…
Sep
13
comment Decimal expansion of $kn$ contains only $0,7$ for some $k \in \mathbb{N}$
Related : math.stackexchange.com/questions/164986/…