Alfonso Fernandez
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 14h awarded Enlightened 15h awarded Nice Answer Mar28 answered How many trailing zeroes in $11^{50}-1$? Mar24 awarded Famous Question Dec26 awarded Yearling Sep19 awarded Notable Question Sep4 reviewed Approve group of permutation - cycles of length $n$ - order of generated group Aug28 reviewed Approve series for $n$-th prime number and prime counting function Aug27 reviewed Approve Studying the function $f(x) = x^4-6x^2$ using derivatives: minima, maxima, inflection, concavity Aug27 reviewed Approve Integration by parts Aug27 reviewed Reject Do journals that published a proof of an important theorem $T$ publish another proof of $T$? Aug27 awarded Popular Question Apr28 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. Apr27 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) Apr20 revised Removing two adjacent edges so that the graph remains connected added 1225 characters in body Apr20 answered Removing two adjacent edges so that the graph remains connected Apr18 revised How to justify this orthogonality? edited body Apr17 answered How to justify this orthogonality? Mar25 comment Find all solutions for $7x^2 \equiv 3 \mod5$, if any. Note that there are only $5$ numbers modulo $5$, so finding the solutions directly is always easy. Mar21 comment Visualizing mathematics and geometry I've heard of mathematicians who lost their eyesight (Even at a very early age) and constructed some beautiful geometry, supposedly being able to visualize things outside of the real world with less distraction, but do you have any examples of mathematicians who were born blind (and thus never had the chance to experience vision) and contributed in geometry?