测试文档

Here is an inline example, \(\pi(\theta)\),

an equation,

\[\nabla f(x) \in \mathbb{R}^n,\]

and a regular $ symbol.

https://github.com/Yang-Xijie/yang-xijie.github.io

https://github.com/Yang-Xijie/yang-xijie.github.io

bold iiii

\(\vec{a}\) \(\vec a\)

\(\boldsymbol u\) \(\boldsymbol{a}\)

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