Yaser Sulaiman
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 Apr 22 awarded Nice Question Oct 26 awarded Good Answer Nov 26 awarded Popular Question Oct 30 awarded Notable Question May 7 awarded Caucus Feb 10 awarded Popular Question Jul 20 awarded Yearling Oct 10 awarded Enlightened Oct 10 awarded Nice Answer Jul 21 awarded Yearling Dec 11 awarded Quorum Sep 7 revised Your favourite maths puzzles corrected spelling Sep 4 comment Proving that $||A-B||=||A+B||\Leftrightarrow AB=0$ @Rasmus: I think @Chandru1 is referring to the other direction of the iff statement. But that is trivial: just go backwards in the original proof. No? Sep 1 comment How Do You Go About Learning Mathematics? "... doing this will get you used to not understanding things, which is important." True words of wisdom. Sep 1 awarded Scholar Sep 1 accepted What is the Direction of a Zero (Null) Vector? Sep 1 comment Finding the Heavy Coin by weighing twice Um.. we'll still face a problem if the weight balance is balanced the first time by having a heavy coin and a light one on each side. Suppose that in this case I followed the proposed solution and replaced the coins on one side with 2 other coins. There's a possibility that these 2 new coins are the remaining 2 light ones. Now, how can I tell which of the coins in the other heavier side is the heavy one? Sep 1 revised Finding the Heavy Coin by weighing twice Updated answer with information that, sadly, invalidates it. Aug 31 answered Finding the Heavy Coin by weighing twice Aug 31 asked What is the Direction of a Zero (Null) Vector?