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Math tricks wiki
The Tricki is a Wiki project meant to capture the strategies and “tricks” used to solve math problems. Other math Wiki projects start from definitions, which often link to some proofs related to the...
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Intersting Wolfram Alpha query
I have previously been underwhelmed by Wolfram Alpha. But today I finally saw a real-life query produce good results. Admittedly, I am probably in the minority of people excited by this: I was...
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Why a negative times a negative is a positive
A few blogs have discussed an intuitive explanation of why multiplying two negatives produces a positive. That would be an explanation which makes sense to a non-mathematician. At Walking Randomly At...
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