Yaser Sulaiman
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 Nov26 awarded Popular Question Oct30 awarded Notable Question May7 awarded Caucus Feb10 awarded Popular Question Jul20 awarded Yearling Oct10 awarded Enlightened Oct10 awarded Nice Answer Jul21 awarded Yearling Dec11 awarded Quorum Sep7 revised Your favourite maths puzzles corrected spelling Sep4 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? Sep1 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. Sep1 awarded Scholar Sep1 accepted What is the Direction of a Zero (Null) Vector? Sep1 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? Sep1 revised Finding the Heavy Coin by weighing twice Updated answer with information that, sadly, invalidates it. Aug31 answered Finding the Heavy Coin by weighing twice Aug31 asked What is the Direction of a Zero (Null) Vector? Jul29 awarded Nice Answer Jul27 awarded Beta