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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
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awarded  Notable Question
Sep
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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
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reviewed Approve Integration by parts
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reviewed Reject Do journals that published a proof of an important theorem $T$ publish another proof of $T$?
Aug
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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
Apr
17
answered How to justify this orthogonality?
Mar
25
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.
Mar
21
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?