Is $y=\frac{x^2}{x^3+3}$ has a horizontal asymptote?
139656
Horizontal asymptote definition
94700
Integer solutions for $x^3+2=y^2$?
62606
Non-existence of $\lim \limits_{(x, y) \to (0,0)} \frac{x^3 + y^3}{x - y} $
99918
The $100$th derivative of $(x^2 + 1)/(x^3 - x)$
47815
Bug with Asymptote: horizontal black lines
40121
Asymptotes of function
31051
Is $f(x,y)=(xy)^{2/3}$ differentiable at $(0,0)$?
67356
When is $2^x+3^y$ a perfect square?
109994
Show discontinuity of $\frac{xy}{x^2+y^2}$
131485
Continuity of $\frac{x^3y^2}{x^4+y^4}$ at $(0,0)$?
52018
Can $\frac{\sqrt{3}}{\sin20^{\circ}}-\frac{1}{\cos20^{\circ}}$ have two values?
108123
Why is $\mathbb{C}[x,y]/(y^2 - x^3 + 1)$ normal?
12375
Prove $\lim_{(x,y) \to (0,0)} \frac{x^3y}{x^4+y^2} = 0$
85480
Let $f(x,y)=\frac{x^3-y^3}{x^2+y^2}$. Is f differentiable in $(0,0)$?
39179
Why is $(0, 0)$ not a minimum of $f(x, y) = (y-3x^2)(y-x^2)$?
14548
Multivariable limit $\frac{(2x^2)y}{x^4+y^2}$
97553
Continuity of $\frac{2xy}{x^2+y^2}$ at $(0,0)$