Alfonso Fernandez
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 Jan 6 awarded Enlightened Jan 6 awarded Nice Answer Dec 26 awarded Yearling Apr 26 awarded Enlightened Apr 26 awarded Nice Answer Mar 28 answered How many trailing zeroes in $11^{50}-1$? Mar 24 awarded Famous Question Dec 26 awarded Yearling Sep 19 awarded Notable Question Sep 4 reviewed Approve group of permutation - cycles of length $n$ - order of generated group Aug 28 reviewed Approve series for $n$-th prime number and prime counting function Aug 27 reviewed Approve Studying the function $f(x) = x^4-6x^2$ using derivatives: minima, maxima, inflection, concavity Aug 27 reviewed Approve Integration by parts Aug 27 reviewed Reject Do journals that published a proof of an important theorem $T$ publish another proof of $T$? Aug 27 awarded Popular Question Apr 28 comment Show a simple strategy. Either I'm missing something or Paula can simply choose $1$ and then keep choosing the same number as Victor until they're all gone. Apr 27 comment Suggest an Antique Math Book worth reading? @JackM I definitely agree that the classical approach to geometry is important and should be studied by anyone learning math. However, I think a new resource discussing these foundations will do it using modern notation and presentation which is easier on modern ears (arguably even genuinely "clearer"), and fits better into later theory. Example: "A prime number is that which is measured by a unit alone." (VII.Def11) Apr 20 revised Removing two adjacent edges so that the graph remains connected added 1225 characters in body Apr 20 answered Removing two adjacent edges so that the graph remains connected Apr 18 revised How to justify this orthogonality? edited body