Goodarz Mehr
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 Jan3 asked Sum of two Dedekind cuts is well-defined Dec27 revised diophantine equation in positive integers added 2 characters in body Dec27 asked diophantine equation in positive integers Dec9 comment graph avoiding cycle of length 4 now I undrestand, thanks a lot :) Dec8 accepted graph avoiding cycle of length 4 Dec8 comment graph avoiding cycle of length 4 I know Jensen's function, but would you please show me how to apply it here? every time I use it on this question I get $m\le \frac{n}{4}(1+2\sqrt{n})$. Dec8 asked graph avoiding cycle of length 4 Nov21 accepted combinatorial geometry: covering a square Nov21 comment Identical colored squares in plane what is geometry of squares?? and BTW for $n=2$, there is an easier way, just consider the leftmost square. squares of the other color satisfy the conditions. I really don't think this needs that much of mathematics because I picked it up from an olympiad paper..... Nov20 comment combinatorial geometry: covering a square yes, overlapping is allowed. Nov20 asked Identical colored squares in plane Nov20 revised combinatorial geometry: covering a square added 2 characters in body Nov20 asked combinatorial geometry: covering a square Oct23 awarded Editor Sep29 comment representing all odd naturals as the sum of four squares, two of them equal nice proof using three-squares theorem. thanks :) Sep29 accepted representing all odd naturals as the sum of four squares, two of them equal Sep28 awarded Supporter Sep28 awarded Scholar Sep28 comment representing all odd naturals as the sum of four squares, two of them equal isn't there an elementry olympiad-level proof for the question? Sep28 awarded Student