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John Douma

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

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  • Member for 7 years, 4 months
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28 Proof: 1007 can not be written as the sum of two primes. Nov 13 '15
18 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
12 How do we know the ratio between circumference and diameter is the same for all circles? May 1 '16
10 Problem with basic definition of a tangent line. Apr 18 '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 '19
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 Why is it that if a ring is simple, its center must be a field? Apr 1 '18
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