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visits member for 2 years, 2 months
seen Jan 20 at 16:58

Jun
25
awarded  Informed
Jun
16
awarded  Critic
Mar
8
comment What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)
I think it's more impressive that if you subtract one from that number, you get its reciprocial.
Oct
22
answered Eleven unit squares inside a larger square
May
15
comment Monochromatic triangles in a two-coloring of the plane
This is posed as a difficult problem number 14.8 in Lovász László, Combinatorial Problems and Exercises, 2nd ed. You may check out the hints given there in the hints section.
Mar
11
comment Number of integer solutions to $3i^2 + 2j^2 = 77 \cdot 6^{2012}$
I don't understand. So what if the ratio $i/j$ is neither 5 nor 5/3?
Mar
9
comment What makes elementary functions elementary?
That definition sounds wrong to me. By that definition, $ \sin x = ax + b $ would have an elementary solution $ x $ as a function of $ a, b $.
Mar
4
comment Need some help settling a bet
Also, in the future, please try to use titles for your posts that help people browsing the titles to decide whether they might be able to help in your question. Eg. here you could use the title “Is there a power of two divisible by three?” or “Splitting pizza to three people evenly by repeatedly halving slices”.
Mar
4
comment Puzzle: $(\Box @)+(\Box @) = (\Box\bigstar\Box$)
@barf: it was probably downvoted because there's an earlier answer that seems complete enough.
Mar
4
comment How many fours are needed to represent numbers up to $N$?
By the way, if you allow logarithms, you don't even need four fours: actually three fours are enough to represent any positive integer like $ \log\bigl(\log 4/\log(\surd\surd\dots\surd4)\bigr)/\log 4 $.
Feb
25
answered Convolution of the Möbius function with itself
Feb
18
awarded  Supporter
Feb
17
awarded  Teacher
Feb
17
answered How to decide that a curve segment is not an ellipse line segment?