Goodarz Mehr
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 Jan7 comment Two functions on two areas having the same integrals Thanks, but can you find some non-constant (and probably continuous) solutions? Sep28 comment Number of different necklaces using $m$ red and $n$ white pebbles Yes, you're right. But things get different when they are not coprime. Sep16 comment 5 moving points in plane, one goes to infinity Nice construction, but you didn't notice the condition that No three of the lines should intersect in one point. Without this condition, making an example for $5$ is also easy, just consider $5$ points on sides and one diagonal of a square. Sep16 comment 5 moving points in plane, one goes to infinity @Feanor: would you please show us your construction? Thanks a lot. Sep12 comment 5 moving points in plane, one goes to infinity @rattle: no, it's not allowed. Sep12 comment 5 moving points in plane, one goes to infinity @alex.jordan: I meant that only at the initial position, non of the points is an intersection point of two lines. It's obvious when they start moving, they may meet each other. Sep11 comment 5 moving points in plane, one goes to infinity To your first question, yes. Each point has it's own track. Also, each point move at its own distinct constant speed. Aug12 comment Minimum number of circles in a rectangle with no line in rectangle not intersecting any of them Thanks, edited. Also it suffices to cover two diagonals to have each line intersecting at least one of them, but I'm intersected in the minimum number of such circles. May15 comment Identical colored squares in plane Thanks!In fact, first of all I found the problem in that article! May14 comment How many ways to paint a rectangle You may also see this one: math.stackexchange.com/questions/112565/… , which is a harder problem! Apr27 comment $6$ points in plane with specific distances Thanks a lot. And would you please place a picture of the figure you say in your post? Apr23 comment $6$ points in plane with specific distances Would you please explain more? I couldn't Undrestand what you said. Thanks Apr17 comment $6$ points in plane with specific distances But then we get that $BEDC$ is a cyclic quadrilateral! Apr13 comment $6$ points in plane with specific distances I've written how to construct that example. Feb27 comment A question of Logic in Olympiad Let me explain what was the problem: I translated this question from persian language into English, and, actually both words ''wrong'' and ''false'' go to the same word in persian, namely ''غلط''. when I was translating them, I translated all of the words ''غلط'' to ''false'', except that one, which I translated it to ''wrong''. now when I was reading the problem, I decided to change that one to ''false'' too. Feb27 comment A question of Logic in Olympiad I'v edited my post. thanks. Feb27 comment A question of Logic in Olympiad @magma: I doubt if there will be any official solution, since it appeared in a multiple choice exam, but if there was one, I'll inform you. Feb27 comment minimum number of vertices for a specific graph thanks a lot. really really beautiful!!!! Feb27 comment minimum number of vertices for a specific graph thats really a great example!!! but how to prove there isn't such a graph having smaller number of vertices? Feb26 comment minimum number of vertices for a specific graph what's the advantage of doing that?