I am sorry for being late. I want post my code on my blog.
\begin{array}{l} \tag{2}
& \min_{v} \nabla f^T v \\newline
& s.t. \quad \|v\| = 1 \quad \nabla g^T v \ge 0
\end{array}
And it is example code and result of my blog. I type backslash(\) twice.
$v$ minimize bleow problem
$$ \\begin{array}{l} \\tag{2}
& \\min\_{v} \\nabla f^T v \\newline
& s.t. \\quad \\|v\\| = 1 \quad \\nabla g^T v \\ge 0
\\end{array} $$
and we can find $v$(return) with the code
```python
def norm_gradient_f_subject_to_g(grad):
if grad @ w.T <= 0: return grad /np.linalg.norm(grad, ord=2)
step_vec = grad @ mT_m
return step_vec / np.linalg.norm(step_vec, ord=2)
```
Although, I can escape markdown rule in code fences, If I use code fences there are some style problem. first, code fences create line numbers. second, I have javascript file that emmite code info tag(top-right python decoration of the example) to div.hilight element so and I include <code> MathJax’s skipTag option.
I not want modify my javascript file and MathJax’s option and line numbers of code block is important for me 
.