title: How to find the Null Space of a matrix in Python using numpy?
body: <p>As the title says, how can I find the null space of a matrix 
  i.e. the <em>nontrivial</em> solution to the equation ax=0.</p>
  
  <p>I've tried to use <code>np.linalg.solve(a,b)</code>, which solves the equation ax=b. So setting <code>b</code> equal to an array of zeros with the same dimensions as matrix <code>a</code>, I only get the <em>trivial</em> solution i.e. x=0.</p>