Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

  7. current community

    your communities

    more stack exchange communities

    company blog
Mathematics
Meta User
Network Profile
5,650
reputation
1
14
20

John Douma

Apparently, this user prefers to keep an air of mystery about them.

264
answers
0
questions
~297k
people reached
  • Member for 6 years
  • 1,222 profile views
  • Last seen 7 hours ago

Communities (6)

Top Network Posts

We respect a laser-like focus on one topic.

Top Tags (178)

Score 42
Posts 29
Posts % 11
Score 41
Posts 13
Score 32
Posts 17
Score 31
Posts 28
Score 30
Posts 22
Score 25
Posts 13
View all tags →

Top Posts (264) All Questions Answers | Votes Newest

26 Proof: 1007 can not be written as the sum of two primes. Nov 13 '15
16 Counting binary operations on a set with $n$ elements Apr 28 '13
12 What is sum of all positive odd integers less than $1000$? Jun 12 '13
11 How do we know the ratio between circumference and diameter is the same for all circles? May 1 '16
10 How do I find a point a given distance from another point along a line? Jun 2 '13
8 If two sets $A$ and $B$ have equal power sets, can we conclude that $A=B$? Oct 7 '15
8 Example of $a,~b\in G$ such that $ab\in H\leq G$ and $a^2b^2\notin H.$ Jan 9
7 If $\int_{a}^b f(x)g(x) dx = 0$ for all continuous functions $g$ satisfying $g(a) = g(b) = 0$, show $f = 0$ Apr 28 '16
7 Problem with basic definition of a tangent line. Apr 18 '16
7 When will two cars pass each other May 16 '13
View all questions and answers →

Badges (35)

Gold

1

Rarest

Silver

14

Rarest

Bronze

20

Rarest

View all badges →