5,133 reputation
1243
bio website facebook.com/jdb1729
location Champaign, IL
age 34
visits member for 2 years, 9 months
seen Apr 29 at 10:14
stats profile views 5,442

Amateur mathematician, professional software engineer. Interested in all kinds of math, becoming a better mathematician, and helping others do the same.

email: jdb1729 (at) gmail.com


May
16
awarded  Nice Question
Mar
22
reviewed Looks Good Why do the $n \times n$ non-singular matrices form an “open” set?
Mar
19
answered Twin prime pair helping to factor large numbers quicker?
Mar
19
reviewed Looks Good Proof that there exists an integer $n \geqslant2$ such that $n^2$ divides $2^n + 3^n$
Mar
19
answered Why is my procedure misleading?
Mar
19
revised flux through the sphere
fix typo
Mar
19
answered flux through the sphere
Mar
19
comment interpolation question. From MyMaxScore free AP BC Calculus exam.
It is an error. The numerator is 387 but it should be 487.
Mar
19
answered interpolation question. From MyMaxScore free AP BC Calculus exam.
Mar
19
answered a random process model which I do not know the name of
Mar
19
revised Evaluate the Integral using Contour Integration (Theorem of Residues)
deitalicize trig functions
Mar
19
revised Need help understanding binary relations…
fix tags
Mar
19
answered Need help understanding binary relations…
Mar
19
revised Limit of constant functions with countable discontinuities
add tag
Mar
19
answered Limit of constant functions with countable discontinuities
Mar
19
comment Number of non-isomorphic ways the following graph can be labelled
@DJ_, imagine if the labels 1 and 2 are swapped in your example: it would be a different graph, but only one of them is being counted by $\binom{3}{2}$.
Mar
19
answered Number of non-isomorphic ways the following graph can be labelled
Mar
7
comment Set of numbers pairwise relatively prime
The problem with your argument is that it is possible that $i=j$, and every integer divides $0$, so the last step $p \lt n-1$ is unjustified.
Feb
27
reviewed Looks Good Integration over inequality
Feb
27
reviewed No Action Needed Integration over inequality