6005

Philadelphia, PA, United States

http://cis.upenn.edu/~castan/

Previous names on stackexchange: Goos, CS

Current:

PhD Computer Science, University of Pennsylvania

Past:

ScB Mathematics - Computer Science, Brown University

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How do towels stay on hooks?

newtonian-mechanics forces friction everyday-life asked Jan 23 '18 at 21:10

physics.stackexchange.com

40 votes

Generating function solution to previous question $a_{n}=a_{\lfloor n/2\rfloor}+a_{\lfloor n/3 \rfloor}+a_{\lfloor n/6\rfloor}$

sequences-and-series combinatorics limits recurrence-relations generating-functions asked Sep 27 '13 at 20:59

math.stackexchange.com

25 votes

Does Planned Parenthood sell the organs of late-term fetuses?

united-states abortion asked Jul 14 '15 at 18:20

skeptics.stackexchange.com

22 votes

Decidability of diophantine equations over {=, +, gcd}

lo.logic nt.number-theory decidability asked Dec 26 '20 at 21:52

cstheory.stackexchange.com

19 votes

A generalization of arithmetic and geometric means using elementary symmetric polynomials

inequality symmetric-polynomials means asked Dec 26 '14 at 2:07

math.stackexchange.com

19 votes

What function satisfies $F'(x) = F(2x)$?

combinatorics reference-request generating-functions delay-differential-eqns asked Jul 18 '15 at 7:04

math.stackexchange.com

18 votes

Riemann zeta function Euler product for primes equivalent to $3$ mod $4$

number-theory riemann-zeta infinite-product asked Aug 30 '15 at 19:40

math.stackexchange.com

18 votes

What is the minimum size of a partial order containing all partial orders of size 5?

co.combinatorics order-theory posets computer-algebra asked Oct 27 '20 at 17:46

mathoverflow.net

15 votes

Why 6 races are not sufficient in the 25 horses, 5 tracks problem

recreational-mathematics puzzle asked Jul 14 '15 at 18:38

math.stackexchange.com

13 votes

Are there infinitely many $\alpha \times \beta$ Chomp boards where player 2 wins?

combinatorial-game-theory asked Sep 6 '16 at 22:42

math.stackexchange.com

Top Answers

152

Referee wants me to add a plot – because the paper has none

academia.stackexchange.com

129

Colleague blames me for not spotting typos when I only reviewed the structure and content

academia.stackexchange.com

$-3^2 = 9?\ $ Correct syntax for a negative number with an exponent.

math.stackexchange.com

Rejection from a legitimate journal, with reviewers recommending me to try a Beall's list journal

academia.stackexchange.com

Is it immoral to advise PhD students in non-industry-relevant topics in middle-lower ranked universities?

academia.stackexchange.com

Are all "numbers" just one unit value transformed by a function?

math.stackexchange.com

Are 'please cite my paper' emails socially accepted?

academia.stackexchange.com

why don't we use machines with random access memory as our basic model of computation?

cs.stackexchange.com

Why is it forbidden by the IEEE to post 'author-submitted' papers on ArXiv?

academia.stackexchange.com

Is it ethical to ask students to proofread a textbook?

academia.stackexchange.com

How to center a table in Google Docs?

webapps.stackexchange.com

Whom to cite from an article: the reporter or the person who provided a quote to the reporter?

academia.stackexchange.com

Advisor to spend some funds to buy things that make group members feel better working at home. Is it selfish to request a tablet and stuff?

academia.stackexchange.com

Is this a new method for finding powers?

math.stackexchange.com

Show that $e^x > 1 + x + x^2/2! + \cdots + x^n/n!$ for $n \geq 0$, $x > 0$ by induction

math.stackexchange.com

What is the formal, rigorous definition of a programming language?

cs.stackexchange.com

Painting the plane, and finding points one unit apart

math.stackexchange.com

Advisor wants first author. Do I have any leverage?

academia.stackexchange.com

Is it good to leave hyperref activated on a conference paper?

academia.stackexchange.com

Missed April 15th deadline to accept grad school offer. What can I do?

academia.stackexchange.com

Why is $2\pi i \neq 0?$

math.stackexchange.com

Finding out the area of a triangle if the coordinates of the three vertices are given

math.stackexchange.com

Area of a part of a square

math.stackexchange.com

Can you give me some concrete examples of magmas?

math.stackexchange.com

How do I use lemmas that are probably already proven, but including the proof myself is quicker than looking up a source?

academia.stackexchange.com

Turing award papers

cstheory.stackexchange.com

Is there an "inverted" dot product?

math.stackexchange.com

Statement provable for all parameters, but unprovable when quantified

math.stackexchange.com

Prove that there exists a number divisible by 1999 with digit sum 1999

math.stackexchange.com

Contradiction: Prove 2+2 = 5

math.stackexchange.com

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6005

How do towels stay on hooks?

Generating function solution to previous question $a_{n}=a_{\lfloor n/2\rfloor}+a_{\lfloor n/3 \rfloor}+a_{\lfloor n/6\rfloor}$

Does Planned Parenthood sell the organs of late-term fetuses?

Decidability of diophantine equations over {=, +, gcd}

A generalization of arithmetic and geometric means using elementary symmetric polynomials

What function satisfies $F'(x) = F(2x)$?

Riemann zeta function Euler product for primes equivalent to $3$ mod $4$

What is the minimum size of a partial order containing all partial orders of size 5?

Why 6 races are not sufficient in the 25 horses, 5 tracks problem

Are there infinitely many $\alpha \times \beta$ Chomp boards where player 2 wins?