4,903 reputation
1636
bio website facebook.com/gregor.ethan
location California
age 18
visits member for 1 year, 10 months
seen 2 days ago

I'm a recent high school graduate living in Los Angeles, California.


2d
reviewed Approve suggested edit on How to write an integral as a limit?
2d
comment Calculate these two series
Re-write the sums in terms of both real and imaginary parts of the complex exponential function, and then treat each sum like a finite geometric series.
2d
revised Calculate these two series
added 10 characters in body
2d
reviewed Approve suggested edit on PEMDAS question: $F(x) = 3x^2 - x+2$. Find $[f(a)]^2$
Sep
12
comment How to show that
@flawr $f(0)=1$, because $f:\mathbb{Z}\longrightarrow \mathbb{N}$
Sep
12
comment How to figure out congruences involving large numbers?
What exactly are you trying to figure out? If the congruence is correct?
Sep
12
answered Find $ \lim\limits_{x \to 0^+}x\int_x^1 \dfrac{\cos t}{t^2}\hspace{1mm}dt$
Sep
12
reviewed Approve suggested edit on How to figure out congruences involving large numbers?
Sep
12
comment Very challenging series
Just by looking at it's base two representation it's easy to see that the number is irrational. Other then that I doubt you will find anything someone would consider a "closed form" representation for this series.
Sep
11
revised Evaluating $\displaystyle\sum_{x=a}^b \left\lfloor {\frac{k}{x}} \right\rfloor$
added 12 characters in body
Sep
11
comment Evaluating $\displaystyle\sum_{x=a}^b \left\lfloor {\frac{k}{x}} \right\rfloor$
When specific bounds are placed on $a$ and $b$ estimating the sum of fractional parts like the one you mention are well known problems, for instance the unsolved Dirichlet divisor problem.
Sep
10
awarded  Necromancer
Sep
10
revised Evaluating $\displaystyle\sum_{x=a}^b \left\lfloor {\frac{k}{x}} \right\rfloor$
added 2 characters in body
Sep
10
revised Evaluating $\displaystyle\sum_{x=a}^b \left\lfloor {\frac{k}{x}} \right\rfloor$
deleted 40 characters in body
Sep
10
revised Evaluating $\displaystyle\sum_{x=a}^b \left\lfloor {\frac{k}{x}} \right\rfloor$
deleted 40 characters in body
Sep
10
revised Evaluating $\displaystyle\sum_{x=a}^b \left\lfloor {\frac{k}{x}} \right\rfloor$
deleted 40 characters in body
Sep
10
revised Evaluating $\displaystyle\sum_{x=a}^b \left\lfloor {\frac{k}{x}} \right\rfloor$
deleted 40 characters in body
Sep
10
revised Evaluating $\displaystyle\sum_{x=a}^b \left\lfloor {\frac{k}{x}} \right\rfloor$
deleted 40 characters in body
Sep
10
revised Evaluating $\displaystyle\sum_{x=a}^b \left\lfloor {\frac{k}{x}} \right\rfloor$
added 410 characters in body
Sep
10
answered Evaluating $\displaystyle\sum_{x=a}^b \left\lfloor {\frac{k}{x}} \right\rfloor$