Nov
17
comment Does $a\ln(x^2 +y^ 2 )+b$ satisfy Laplace’s equation?
your calculations are right and $F_{yy} = -F_{xx}$
Nov
17
reviewed Approve Does $a\ln(x^2 +y^ 2 )+b$ satisfy Laplace’s equation?
Nov
17
answered Factorize $999999$ into a product of irreducibles in $\mathbb{Z}[i]$ (clarification)
Nov
17
revised Factorize $999999$ into a product of irreducibles in $\mathbb{Z}[i]$ (clarification)
latex
Nov
16
revised Can a function that satisfies the condition $f''(x) = a \cos f(x) $ and $(f'(x))^2 = b \sin f(x)$ be found?
latex, tags for equations
Nov
16
reviewed Approve How to evaluate the integral $\int e^{x^3}dx $
Nov
16
comment Show that no linear polynomial divides $x^k + x^{k-1} + \cdots + 1$ with $k\ge 2$ even
$x^3+x^2+x+1=(x+1)(x^2+1)$
Nov
16
revised Show that no linear polynomial divides $x^k + x^{k-1} + \cdots + 1$ with $k\ge 2$ even
typo
Nov
16
answered Show that $A\cap B\subseteq A$ and $A\subseteq A\cup B$
Nov
16
revised Show that $A\cap B\subseteq A$ and $A\subseteq A\cup B$
latex
Nov
14
reviewed Reject Concavity of function $F(x)=x^{1/5}(x+6)$
Nov
6
answered How are the elementary arithmetics defined?
Nov
4
reviewed Approve The set of all philosophers is a camel
Nov
4
reviewed Reject Minimum Distance between two curves, points, and point and curve
Nov
4
reviewed Edit Vector calculus minimization
Nov
4
revised Vector calculus minimization
introducing $$ to latex
Nov
4
reviewed Approve Find the conditions for the cubic polynomial to always be increasing
Nov
4
answered Min/Max Problem
Oct
31
reviewed Approve How does a complex exponential turn into the sinc function?
Oct
30
reviewed Reject {$e_1, e_2, e_3, e_4$} be a standard basis in $R^4$. Does there exist a set of vectors $x_1, x_2, x_3$ such that