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 Apr17 asked Understanding and teaching the concept of derivative Dec14 awarded Caucus Sep13 revised Number of partitions of number n and number 3n added 265 characters in body Sep12 revised Number of partitions of number n and number 3n added 221 characters in body Sep12 answered Number of partitions of number n and number 3n Jul28 awarded Necromancer Jul2 awarded Curious Jun15 comment What is the probability that all 4 cards have different value? IMO the approach and the result are correct. May31 answered How many $3$-Letter Strings from come from $ABRACADABRA$? May31 comment How many $3$-Letter Strings from come from $ABRACADABRA$? I've got only 97 strings ... May6 comment fixed point iteration $x_{k+1}=f(x_k)$ with multiple fixed points Why is $f(0)=0$? May4 asked Practical use and applications of improper integrals Apr27 awarded Custodian Apr27 reviewed Approve Good book on integral calculus (improper integrals, integrals with parameters, special functions) Apr27 asked Good book on integral calculus (improper integrals, integrals with parameters, special functions) Apr11 revised Book on combinatorial identities corrected spelling Apr10 comment Prove or disprove: $(\frac{1}{n})^n(1 - \frac{1}{n})^{n^2-n} \simeq \frac{1}{n!}$ as $n \rightarrow \infty$. What does the Stirling formula tells you, if you replace $1/e$ by $(1-1/n)^n$? Apr10 comment Book on combinatorial identities The book of Riordan is OK. I would have hope for more examples with direct combinatorial arguments, yet the methods presented are interesting and worth studying. Apr10 comment Limit of a function without using L'Hôpital Rule I agree with Daniel Fischer. Your question is clearly dependent on how you define the logarithm (hence, what properties of the logarithm are assumed). That is because your question is a basic property of the logarithm (which, in terms of derivatives, is the derivative of $\log(1+x)$ at $x=0$. Apr10 answered Implicit solution to second-order non-linear differential equation