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EPN
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If you are asking a question about the mean value of a multiplicative function, I encourage you to read these two answers:

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question
171
What are examples of very aggressive openings?
May 2, 2012
question
25
Playing the French Defense Exchange Variation
Jun 23, 2012
question
19
How do you judge a sacrifice?
May 7, 2013
answer
18
Why is the King's Gambit not played often?
May 2, 2012
question
17
Endgame: Rook + Knight vs Rook
Sep 9, 2012
question
15
Why are there no more exhibition games between top players and computers?
Jun 20, 2012
answer
14
Why is the light-squared bishop considered White's best bishop?
May 4, 2012
question
13
What are some common chess traps?
Jun 12, 2012
question
12
What motivated Kasparov's comments on the Anand-Gelfand match?
Jun 12, 2012
answer
12
What is it about Magnus Carlsen?
Jun 20, 2012
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Vote Early. Vote Often
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401
How can I evaluate $\sum_{n=0}^\infty(n+1)x^n$?
280
The Mathematics of Tetris
175
$\int_{-\infty}^{+\infty} e^{-x^2} dx$ with complex analysis
129
Direct Proof that $1 + 3 + 5 + \cdots+ (2n - 1) = n\cdot n$
106
100 Soldiers riddle