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Latex overset and underset

How to write latex overset and underset: \overset \underset


Latex Overset \overset

\frac{f(x+\delta x)-f(x)}{\delta x}
  \overset{\delta x\to 0}{\longrightarrow}
f'(x)

$$\frac{f(x+\delta x)-f(x)}{\delta x} \overset{\delta x\to 0}{\longrightarrow} f’(x) $$

A \overset{f}{\rightarrow} B

$$A \overset{f}{\rightarrow} B$$

Latex Underset \underset

\frac{f(x+\delta x)-f(x)}{\delta x}
  \underset{\delta x\to 0}{\longrightarrow}
f'(x)

$$\frac{f(x+\delta x)-f(x)}{\delta x} \underset{\delta x\to 0}{\longrightarrow} f’(x) $$

A \underset{f}{\rightarrow} B

$$A \underset{f}{\rightarrow} B$$