#!/usr/bin/env python
# coding: utf-8

# In[1]:


from IPython.display import HTML
js = r"""
<script type="text/Javascript">
MathJax.Hub.Config({
  TeX: {
    Macros: {
      vect: ["{\\vec #1}",1],
      abst: ["{\\lvert #1 \\rvert}",1]
    }
  }
});
</script>
"""
HTML(js)


# $\vect{x} \abst{y}$