)z(i-1)]/l(i,i)</pre><pre> l(N,N) = A(N,N)-A(N,N-1)u(N-1,N)
 z(N)   = [B(N)-A(N,N-1)z(N-1)]/l(N,N)
 </pre><p>2) Solve UX=Z</p>
<pre>
 c(N)=z(N)</pre><pre> FOR i=N-1, ..., 1
   c(i)=z(i)-u(i,i+1)c(i+1) 
 </pre><p>c(i) for i=1, ..., n-1 are needed to compute the n-1 polynomials. b(i) and d(i) are computed as:</p>
<ul>
<li>b(i) = [y(i+1)-y(i)]/h(i)-h(i)*[c(i+1)+2*c(i)]/3</li>
<li>d(i) = [c(i+1)-c(i)]/[3*h(i)] Moreover, a(i)=y(i).</li>
</ul>
<dl class="section user"><dt>Behaviour outside the given intervals</dt