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1d
accepted How to form 3 groups and allocate them different district?
1d
asked How to form 3 groups and allocate them different district?
Jan
25
awarded  Notable Question
Jan
22
awarded  Notable Question
Jan
22
comment $\{x|x$ is a positive integer definable in one line of type $\}$
my understanding is that a set (type) of numbers that can be described/defined unambiguously in one line/sentence
Jan
22
accepted Why $\{ \emptyset \} $ is not a subset of $\{ \{\emptyset \} \} $
Jan
22
asked Why $\{ \emptyset \} $ is not a subset of $\{ \{\emptyset \} \} $
Jan
21
awarded  Popular Question
Dec
29
accepted Elementary number theory equation simplification
Dec
29
comment Elementary number theory equation simplification
i didn't get what do you mean by $3^{-1}=2$?
Dec
29
asked Elementary number theory equation simplification
Dec
8
comment Show that if $n \equiv 4\pmod 9$, then $n$ cannot be written as the sum of three cubes.
oh, thanx @Nitrogen very good tip, if $a\equiv b (\mod m)$ then $a+c\equiv b+c (\mod m)$, in our case since $9\equiv 0 (\mod 9)$ then $9-1\equiv 0-1 (\mod 9)$
Dec
8
asked Show that if $n \equiv 4\pmod 9$, then $n$ cannot be written as the sum of three cubes.
Dec
2
accepted Prove that $n$ is prime
Dec
2
comment Prove that $n$ is prime
cool hint, thanx :)
Dec
2
asked Prove that $n$ is prime
Nov
28
comment Find two solutions of $299x+247y=13$
+1 for nice trick :)
Nov
28
accepted Find two solutions of $299x+247y=13$
Nov
28
comment Find two solutions of $299x+247y=13$
@PeterWoolfitt, this question is from the 1st chapter of dudley, whereas diophantine is 3rd chapter
Nov
28
asked Find two solutions of $299x+247y=13$