165 reputation
8
bio website joelchristophel.com
location Reading, PA USA
age 19
visits member for 1 year, 1 month
seen yesterday

17h
awarded  Curious
1d
asked Prove that $gcd(a, b) = gcd(b, a-b)$
Oct
22
awarded  Critic
Oct
22
asked How to prove a compound number is prime
Oct
8
comment Show that there exists a bijection from $(0,1)$ to $(0,1]$
Yeah, but $\frac{1}{n}\wedge2|n\wedge n\in\mathbb{N}\Leftrightarrow\frac{1}{2^{n}}:n\in\mathbb{N}$, silly
Oct
8
accepted Show that there exists a bijection from $(0,1)$ to $(0,1]$
Oct
8
comment Show that there exists a bijection from $(0,1)$ to $(0,1]$
Revision to the above: $2x$ if $x=\frac{1}{n}\wedge2|n\wedge n\in\mathbb{N}$. Will you confirm if I get it right?
Oct
8
comment Show that there exists a bijection from $(0,1)$ to $(0,1]$
Funny indeed. So I'm feeling the missing predicate is $x=\frac{1}{n}$ for $n\in\mathbb{N}$ because when $x = \frac{1}{2}$, $y$ should be $2(\frac{1}{2}) = 1$, etc.
Oct
8
comment Show that there exists a bijection from $(0,1)$ to $(0,1]$
Of course I wanted that. But it is fine that you did not provide that. I just thought you were attempting to provide it. Simple miscommunication :)
Oct
8
comment Show that there exists a bijection from $(0,1)$ to $(0,1]$
I understand your first sentence. But I don't understand "$f(x) = 2x$ for some values of $x$." Isn't "some values of $x$" ambiguous?
Oct
8
asked Show that there exists a bijection from $(0,1)$ to $(0,1]$
May
31
accepted Lack of 0 in a 2-sample confidence interval
May
31
revised Lack of 0 in a 2-sample confidence interval
edited body
May
30
revised Lack of 0 in a 2-sample confidence interval
added 9 characters in body
May
30
accepted Normal distribution without standard deviation given
May
30
asked Lack of 0 in a 2-sample confidence interval
May
30
asked Normal distribution without standard deviation given
May
6
asked What things to memorize for AP Calculus AB Exam
Feb
22
awarded  Commentator
Feb
22
comment Use z confidence interval to estimate population proportion
Thank you. This cleared things up