$$\lim_{y \to 0^-}\left(1 \cdot \frac{1}{y}\right) = \infty$$ More at y→0 from the left $$\lim_{y \to 0^+}\left(1 \cdot \frac{1}{y}\right) = \infty$$ $$\lim_{y \to \infty}\left(1 \cdot \frac{1}{y}\right) = 0$$ More at y→oo $$\lim_{y \to 1^-}\left(1 \cdot \frac{1}{y}\right) = 1$$ More at y→1 from the left $$\lim_{y \to 1^+}\left(1 \cdot \frac{1}{y}\right) = 1$$ More at y→1 from the right $$\lim_{y \to -\infty}\left(1 \cdot \frac{1}{y}\right) = 0$$ More at y→-oo