LaTex rendering doesn't support underbraces

[asmaier]

The following equation is not rendered at all

$$A=\underbrace{\frac{1}{2}A + A^T}_{\text{symmetric}}+\underbrace{\frac{1}{2}A - A^T}_{\text{antisymmetric}}$$

see here:

$$A=\underbrace{\frac{1}{2}A + A^T}{\text{symmetric}}+\underbrace{\frac{1}{2}A - A^T}{\text{antisymmetric}}$$

Removing the underbraces command renders the equation

$$A=\frac{1}{2}A + A^T+\frac{1}{2}A - A^T$$

like

$$A=\frac{1}{2}A + A^T+\frac{1}{2}A - A^T$$