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Mar
31
answered Let $G$ a group of order $6$. Prove that $G \cong \Bbb Z /6 \Bbb Z$ or $G \cong S_3$.
Mar
31
comment Finding the indefinite integral $\int\frac{\sqrt{x+8}}{\sqrt{x-3}-\sqrt{x+3}}dx$
@GitGud I made mistakes... you're right.
Mar
31
revised Finding the indefinite integral $\int\frac{\sqrt{x+8}}{\sqrt{x-3}-\sqrt{x+3}}dx$
mistakes
Mar
31
revised Finding the indefinite integral $\int\frac{\sqrt{x+8}}{\sqrt{x-3}-\sqrt{x+3}}dx$
edited body
Mar
31
comment Finding the indefinite integral $\int\frac{\sqrt{x+8}}{\sqrt{x-3}-\sqrt{x+3}}dx$
I multiplied by what I said. $x=0$ is not part of the domain of that function becuase there's a $\sqrt{(x-3)}$
Mar
31
answered Finding the indefinite integral $\int\frac{\sqrt{x+8}}{\sqrt{x-3}-\sqrt{x+3}}dx$
Mar
28
answered Find a $2$ by $3$ system $Ax=b$ whose general solution is…
Mar
26
comment Proof of the optimality of A* algorithm
In questions like this, you should always post a link to the paper,... the question is not general enough to consider that self-contained, plus you're referring to a particular proof
Mar
25
awarded  Informed
Mar
24
comment Are there any geometric interpretations to uniform continuity?
@JulienClancy Yes, I actually think that is the best thing of mathematics (when outcomes of formality that looked like the intuitive thing at first, are so weird)
Mar
24
comment Are there any geometric interpretations to uniform continuity?
@JulienClancy Although we always have this pathologic (very interesting) cases, I think that intuitive interpretations for this things are important too.
Mar
22
accepted Arithmetic progression topology
Mar
22
comment Arithmetic progression topology
@kahen Thanks, I'll read about it.
Mar
22
asked Arithmetic progression topology
Mar
22
comment How did Euler prove the Mersenne number $2^{31}-1$ is a prime so early in history?
They didn't compute every single possibibility, like we would do with a computer nowadays. Note that some mersenne numbers were found before smaller ones. For example, $M_{127}$ was found to be prime before $M_{61}$, $M_{89}$ and $M_{107}$. So they probably did it in a different way. Read this: en.wikipedia.org/wiki/Mersenne_prime for some primality tests on mersenne numbers.
Mar
22
accepted Are these open sets?
Mar
22
comment Are these open sets?
Thanks for the different approach. Really simple proof. Thanks again! I'm accepting this answer (all 3 were just perfect, there's no really reasonable reason for that)
Mar
22
comment Are these open sets?
Thanks, so that's really what I did in my EDIT part of the question, plus for unbounded sequences of $b_i$.
Mar
22
comment Are these open sets?
@FrankMcGovern You opened my eyes :) Thanks!
Mar
22
asked Are these open sets?