# tohecz

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bio website kmlinux.fjfi.cvut.cz/… location Prague, Czech Republic age 27 member for 2 years, 2 months seen 16 hours ago profile views 133

Math PhD student at Czech Technical University in Prague and at LIAFA in Paris. At the same time, I'm a typesetter (and partly the copy editor) of one scientific journal (done in LaTeX, of course).

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# 338 Actions

 Aug17 comment Is there an interval notation for complex numbers? +1 This just shows that defining a complex interval to be a rectangle doesn't sound like a great idea... Aug17 comment Is there an interval notation for complex numbers? @GEdgar Better one: Do not introduce notation unless you are 111% sure you need it and it makes your paper easier to follow. Aug10 revised What is remainder when $5^6 - 3^6$ is divided by $2^3$ (method) improved formatting Aug10 suggested approved edit on What is remainder when $5^6 - 3^6$ is divided by $2^3$ (method) Aug8 comment What is the oldest open problem in geometry? @DavidH Sorry, the margin I mean the comment area is too small to catch all of that :D Aug8 comment What is the oldest open problem in geometry? @littleO This problem is as old as the humankind. First, we thought that the earth is flat. Then we realized that it's not flat, then we forgot this and neglected it, then we found out it's true. Then we thought that the whole space is flat (i.e., $\simeq\mathbb R^3$), only to realize that this is not true either. Aug1 revised Produce unique number given two integers added 130 characters in body Aug1 answered Produce unique number given two integers Jun13 comment Proof of irrationality of a series +1 very nice, simple, straighforward yet not trivial argument :) Jun5 comment Prove $\sqrt6$ is irrational sorry, corrected. And well, I say that I use stronger weapons, which can be used in a large framework, I know that simpler solutions exist. Jun5 revised Prove $\sqrt6$ is irrational added 2 characters in body Jun3 answered What is a Parabolic Fixed Point? Jun3 answered Prove $\sqrt6$ is irrational Jun3 comment Evaluate a limit (probably involving L'Hôpital rule) you should use exp in the appropriate places I believe, now you mix e as a number and e(x) as a function. Mar31 comment How do I integrate $\frac{1}{x^6+1}$ @MorganWilde Because you have to, the space of polynomials modulo a quadratic polynomial is generated by $1,x$ and not only by $1$. Mar31 comment How do I integrate $\frac{1}{x^6+1}$ +1 certainly faster than my approach. It's been a while I knew these tricks, now I remember only the general techniques :-/ Mar31 comment How do I integrate $\frac{1}{x^6+1}$ @MorganWilde No worries, I added a small tutorial. Mar31 revised How do I integrate $\frac{1}{x^6+1}$ added 495 characters in body Mar31 answered How do I integrate $\frac{1}{x^6+1}$ Mar31 comment which axiom(s) are behind the Pythagorean Theorem @William if $A_1\wedge A_2\wedge\dots\wedge A_n \Leftrightarrow B$, then $B$ is equivalent to the system of axioms $A_1,\dots,A_n$, so I'm no quite sure what you speak to in the second part. And if $A\wedge B\Rightarrow T$ and $A\wedge C\Rightarrow T$ and $A\wedge B\not\Rightarrow C$ and $A\wedge C\not\Rightarrow T$, then you got two non-equivalent proofs of your theorem $T$. I would never "guess" which axioms are "better" in any other way than possibility to derive ones from the others. (But maybe it's just too late and I overlook some stupidity in my arguments.)