title: Taco notation for Kroenecker product
body: <p>I'm using the online taco compiler demo (<a href="http://tensor-compiler.org/codegen.html" rel="nofollow noreferrer">http://tensor-compiler.org/codegen.html</a>) and confused as to the use of letters in the notation.</p>
  
  <p>I'm trying to do the kroenecker product of a 4x4 and 3x3 matrices which would result in a 12*12 matrix.</p>
  
  <p>I don't understand the meaning of the letter. this seemed intuitive to me. </p>
  
  <pre><code>A(i,i) = B(j,j) * C(k,k)
  Computations with transpositions are not supported, but are planned 
  for the future.
  </code></pre>
  
  <p>I don't know if this is the correct message or more likely i've done it wrong. any advice would be greatly appreciated. thanks :-)</p>