Does someone know what this notation means? It is in the context of one period of a trigonometric function (when a function approaches infinity)
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$\displaystyle x \to \frac{\pi}{2}^-$ means "make $\displaystyle x$ approach $\displaystyle \frac{\pi}{2}$ from the left". $\displaystyle x \to \frac{\pi}{2}^+$ means "make $\displaystyle x$ approach $\displaystyle \frac{\pi}{2}$ from the right".
and "from the left" means that $\displaystyle x<\frac \pi2$. "from the right" is the other way round
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