48s
comment Do players lose a point in a game on purpose as part of strategy?
Kyrgios clearly tanked a game in the second set against Gasquet today. But it seemed to be mostly from frustration: Nick Kyrgios gives up entirely during game against Richard Gasquet at Wimbledon (BTW he lost the match in four sets.)
35m
revised Quantity of elements of order $d$ in $Z_n$, with $d | n $
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35m
revised Quantity of elements of order $d$ in $Z_n$, with $d | n $
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1h
comment Is this correct? or incorrect? volume and surface area of cuboids
You wrote in your post that you have problems adding an images to a post. See here: How to upload an image to a post?.
1h
revised Is this correct? or incorrect? volume and surface area of cuboids
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2h
revised Is the Schwarz inequality a special case of the Cauchy-Schwarz inequality?
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2h
comment Reference on Malcev completion
I am not familiar with this construction. However, some references are mentioned in ncatlab article: ncatlab.org/nlab/show/Mal%27cev+completion
2h
comment highest-common-factor $\cong$ greatest-common-divisor
@MichaelHardy Any user who has score at least 5 in the (greatest-common-divisor) tag can suggest a synonym here. Then other users with sufficient score can vote for or against the synonym. But in this case I would expect moderators to do that since +16/-1 seems to me like a clear sign of consensus. (If a moderator suggests a synonym, it is approved immediately, without need of votes from other users.) I have mentioned this in the Mods' Office.
2h
revised Show that in any triangle, we have $\frac{a\sin A+b\sin B+c\sin C}{a\cos A+b\cos B+c\cos C}=R\left(\frac{a^2+b^2+c^2}{abc}\right),$
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2h
revised inscribed circle in $n$-gon
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2h
revised $\frac{AB}{A'B'}+\frac{BC}{B'C'}+\frac{CA}{C'A'} \geq 4 \left(\sin{\frac{A}{2}}+\sin{\frac{B}{2}}+\sin{\frac{C}{2}}\right). $
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2h
comment Guessing one root of a cubic equation for Hit and Trial
It is not true that $d$ is product of the roots. What is true is that $x_1x_2x_3 = - \frac da$. (See Vieta's formulas.)
3h
revised Showing a function is injective using that $f'(x)\ne0$
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3h
revised Need an Explanantion
changed tinyurl to Google Books link (to prevent potential link rot)
4h
revised Find the value of $x$ such that $\sqrt{4+\sqrt{4-\sqrt{4+\sqrt{4-x}}}}=x$
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4h
comment Show that for all real numbers $a$ and $b$, $\,\, ab \le (1/2)(a^2+b^2)$
See also Simple algebra question - proving $a^2+b^2 \geqslant 2ab$
4h
comment Simple algebra question - proving $a^2+b^2 \geqslant 2ab$
See also Show that for all real numbers $a$ and $b$, $ab \le (1/2)(a^2+b^2)$
4h
comment Can my students ask questions in Chinese here, and can I write answers in Chinese?
@bfhaha Since you have mentioned TeX /MathJaX in chat, I will add that most regular users of mathematics chatroom user the bookmarklets linked in this answer. (Although this is not relevant to the original discussion.)
5h
revised Descartes Circle
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5h
revised Taking limits on each term in inequality invalid?
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