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visits member for 4 years, 2 months
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5h
comment Regular polygon inside another?
@Zubin: How do you prove that the triangles are similar? If you could do that, the result would follow almost immediately.
5h
comment Regular polygon inside another?
This is an entirely different question!
1d
comment Trying to subtract 2 fractional
@Erik: It's not because your native language isn't English though, is it? Your English is very good. It's because you lack a basic mathematical vocabulary in Norwegian.
1d
comment Trying to subtract 2 fractional
@Erik: Are you serious? "Axiom" is "aksiom" in Norwegian. Theorem" is "teorem".
1d
comment Proving a palindromic integer with an even number of digits is divisible by 11
Your reasoning in the line marked ** is perfectly valid. The proof itself would also be valid, if not for that small mistake that David Holden mentions.
2d
awarded  Nice Answer
2d
comment Dividing by 2 numbers at once, what is the answer?
You haven't answered the question, which was: which one of these does $a/b/c$ mean?
Oct
17
comment What are the odds of hitting exactly 100 rolling a fair die
This is obviously wrong. If you get to, say, 96, you don't have just a single chance to hit 100: you might throw a 1 followed by a 3, for instance.
Oct
17
comment Koch snowflake versus $\pi=4$
A good answer to a good question! Given a finite number of consecutive points on a curve, that curve is at least as long as the sum of the distances between the points.
Oct
14
comment Longest sequence of distinct squares which sum to a given number
Is $a_k$ is uniquely determined? There may be more than one maximum-length sequence for a given $n$.
Oct
13
comment Is this true? $\forall x, y \in\mathbb{Q}: (\sin(x)=\sin(y))\Rightarrow (x=y)$
Your argument would apply equally to $\cos(x)$, but your conclusion would be false (because $\cos(x) = \cos(-x)$, and if $x$ is rational, then so is $-x$). So you have to be a bit more careful.
Oct
13
comment Finite binary representation of float number
If you're talking about proving things, you have to start with a precise statement of the problem! A real number can be negative, but $m,n \in \mathbb N$ can't be. So the statement is false.
Oct
13
answered Show that if taken 14 number from 1 to 25 at least one of them is multiple of another
Oct
13
comment Gambler's fallacy and the Law of large numbers
This is meaningless.
Oct
12
comment Third degree polynomial with integer coefficient from which one is odd has no integer roots
I don't get it. $x^3+x^2-10x+8=(x+4)(x-1)(x-2)$ has three integer roots, and the coefficient of $x^2$ is odd. What haven't you told us?
Oct
12
comment Parabola max. number
"horizontally": only if the directrix is horizontal. You should say "parallel to the directrix".
Oct
11
comment XOR of two numbers AND third number ?
It's not true. Take for example $x=3, a=1, b=2$.
Oct
10
comment Rewriting an infinite sum
@V.Vocor: This is just wrong! The constant term $a_0$ is missing. Please unaccept it!
Oct
10
comment Find different sequences of game to find winner
The games that Bob can win can be chosen in $\binom{n+b-1}{b}$ ways, I think.
Oct
10
comment Rudin PMA question
Yes: "with bounded derivative" means, a fortiori, "with derivative".