Aug
10
comment $\left | -(x+2)^2+6(x+2) \right |>13$
related to math.stackexchange.com/questions/892613/…
Aug
10
revised Is this function decreased with $x$?
Maxima output added
Aug
10
revised Is this function decreased with $x$?
added 13 characters in body
Aug
10
answered Is this function decreased with $x$?
Aug
10
reviewed Approve suggested edit on Mean (average) distance of point to line segment
Aug
10
comment Break Even Point
Your costs per $x$-thousand units is $C(x)$ thousand dollars so the costs per unit are $\frac{C(x)}{1000x}$ thousand dollars. This are $1000 \frac{C(x)}{1000x}$ dollars. This is equal to $\frac{C(x)}{x}$ dollars per unit. The price per unit is $p(x)$ dollars.
Aug
9
comment Sequential Algebraic Problem:
-1 for posting a picture of the text
Aug
9
comment Probability problem from FELLER'S book
@Jorge Fernández: My vote on this answer is locked until it is edited. Otherwise I would revoke my downvote due to the comment of André Nicolas.
Aug
9
comment Probability problem from FELLER'S book
@André Nicolas: Thank you for the explanation. Now I understand. This is a very instructive example.
Aug
9
comment Probability problem from FELLER'S book
-1 I don't understand your argumentation. But your numbers contradict the numbers of @André Nicolas, who is right.
Aug
8
comment Deciding whether a number is rational (2 examples)
I corrected the error reported by @hjpotter92
Aug
8
revised Deciding whether a number is rational (2 examples)
corrected the error reported by @hjpotter92
Aug
8
comment Show that $AB^{-1}$ and $B^{-1}A$ have the same eigenvalues
+1 It is short, it uses the definition of eigenvalue/eigenvector and it does not use the fact that $B$ has an inverse $B$. So it immediatly proofs that $AB$ and $BA$ have the same eigenvalues.
Aug
8
revised Number of irrational roots of the equation $3^x8^{\frac{x}{x+1}}=36$
edited title
Aug
8
comment Is $g$ increasing?
This follows from "If $A \subseteq B$ then $\sup(A) \le \sup(B)$"
Aug
8
reviewed Approve suggested edit on Linear Diophantine equation $3x + 5y = 11$
Aug
4
comment Struggling to evaluate this limit: $\;\lim_{x\to 0} {\sqrt{2+x^2}-\sqrt{2-x^2}\over x^2}$
-1 for doing other people's homework meta.math.stackexchange.com/questions/16412/…
Aug
3
asked Calculating grobner bases in Maxima
Aug
2
revised How find this system equation
link added, orthography, two paragraphs swapped
Aug
2
answered How find this system equation