F is submodular if 
F(intersection(A,B) + union(A,B)) &lt;= F(A) + F(B)<p>And in this way we can actually cut and copy code into text boxes like this one.  Whereas we can&#x27;t with the math forumulas which use a bunch of notation that doesn&#x27;t work in plaintext.<p>Also, most math notation uses a bunch of stuff that has no meaning without context (which isn&#x27;t usually provided to novice readers).<p>I view math notation as artificial barriers to entry for programmers that didn&#x27;t have a chance to go to university.