Jul
22
comment Need a solution to find the locus of an equation.
If $(x,y)$ is a point in the plane, what is its distance from $(0,a$)? What is its distance from the $y$-axis?
Jul
22
revised Need a solution to find the locus of an equation.
wording, format
Jul
22
revised Linear Programming to find the loan plan to minimize the interest payment
reasoning without using LP program
Jul
22
answered Linear Programming to find the loan plan to minimize the interest payment
Jul
22
comment Linear Programming to find the loan plan to minimize the interest payment
Your objective is not to minimize $1.1L + 1.04S - (C_1....C_6)$ but to maximize $C_6$ which is equivalent to minimize $1.1L + 1.04S$
Jul
19
comment System of quadratic equations with three variables
+1 sorry, I did not see this. I had to change your post otherwise I could not change the downvote to an upvote. But I hope that my edit makes sense anyway
Jul
19
revised System of quadratic equations with three variables
reference to the solution of the OP
Jul
19
comment System of quadratic equations with three variables
-1 because you don't show us your solution
Jul
19
comment Showing that $A\rightarrowtail A \times \{x\}$ is a bijection
show that if f(a)=f(b) then a=b. So f is injective. Show that for an tuple (a,x) there is a y from A such that f(y)=(a,x) (What is the value of y?).So f is surjective.
Jul
12
awarded  Revival
Jul
8
reviewed Approve suggested edit on Matrices and algebra
Jun
27
revised Russian roulette should a player pull the trigger or spin the cylinder
orthography
Jun
19
reviewed Approve suggested edit on A generalized combinatorial identity for a sum of products of binomial coefficients
Jun
13
comment How Find the diophantine equation $x_{1}x_{2}x_{3}\cdots x_{n}=x_{1}+x_{2}+\cdots +x_{n}$
Why do you think that $f(n)\ge n$? What other triples$(x_1,x_2,x_3)$ satisfy the conditions?
May
26
comment Can $x^3+3x^2+1=0$ be solved using high school methods?
+1 very smart. But I think using numbers instead of strange looking symbols for referencing the equations would make a text easier to read.
May
26
comment Feedback on my answer for $X^n + Y^n = Z^n $
$$0^3+0^3=0^3$$ $$0^3+1^3=1^3$$ $$1^3+0^3=1^3$$ are solutions. The famous Fermat's Last Theorem states that for $n>2$ there are no solution with positive integers.
May
24
comment A question about the minesweeper game
@ajotatxe: you are right
May
24
comment A question about the minesweeper game
For the $n*1$ board the maximum is $\lceil \frac{n}{2} \rceil$.
May
24
comment A question about the minesweeper game
Of course the maximum exists. If you add a bomb to the board the sum will be changed by a value in $\{-8,\ldots,8\}$. So the maximum is less or equal than $8*\text{lengh}*\text{width}$.
May
22
awarded  Yearling