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Jun
26
answered Plot of a … Square?
Jun
26
answered Proof: If $Ax=b$ has more than one solution, it has infinitely many solutions
Jun
24
comment Amount of solutions added to a system of equations through the application of non-invertible operations.
Ad 1: See my edit in $(2)$. Ad 2: There is of course no general rule that would cover all computations mathematicians are envisaging$\ldots$
Jun
24
revised Amount of solutions added to a system of equations through the application of non-invertible operations.
added 40 characters in body
Jun
23
revised Amount of solutions added to a system of equations through the application of non-invertible operations.
added 53 characters in body
Jun
23
revised How to prove this product rule?
added 45 characters in body
Jun
23
answered How to prove this product rule?
Jun
23
answered Amount of solutions added to a system of equations through the application of non-invertible operations.
Jun
22
comment Secretary Problem - Optimal algorithm for expected value of candidate.
In this way it becomes a totally different problem. You would have to make assumptions about the distribution of talents.
Jun
22
comment Secretary Problem - Optimal algorithm for expected value of candidate.
It's unclear what you mean by $c^{best}$. If it is supposed to be a rank then $c^{best}=1$, by definition.
Jun
22
revised Probability of winning a book
added 577 characters in body
Jun
22
awarded  Nice Answer
Jun
21
answered If $f'$ is increasing and $f(0)=0$, then $f(x)/x$ is increasing
Jun
21
comment does epsilon-delta definition of limit presuppose that the function is defined everywhere at (x-delta,x+delta)?
It is tacitly understood that only points $x$ in the domain of $f$ have to pass the test.
Jun
21
comment Take $k$ shoes ($k \leqslant n$) from a wardrobe. What is the expected value of the number of pairs ($X$) you take?
After simplifying one obtains ${\mathbb E}(X)={1\over 2n-1}{k\choose 2}$. Maybe there is an intuitive explanation for this result.
Jun
21
answered Describe the curves followed by the raindrops in the following question
Jun
21
answered Probability of winning a book
Jun
21
answered Trying to understand a proof about onto/1-1 mappings (from Herstein's Topics in Algebra)
Jun
20
answered Finding the right integral to calculate the area
Jun
20
comment Intuition behind odds of winning 0 times approaching 1/e
We only can answer your question if you tell us what your intuition about $e$ is.