please use this package:
\usepackage{color}
======================
commands:

\textcolor{green}{m(H)}
\textcolor{green}{t(H)}
\textcolor{green}{D(n)+1}
\textcolor{green}{D(n)+t(n)-1}
\textcolor{green}{D(n)}
\textcolor{green}{m(H)}
m(H)
t(H)
D(n)=O(\log n)
D(n)
O(E+V\log V)
O(E\log V)
O(D(n))
\Delta \Phi \leq c+2(-c+2)=4-c
m(H')\leq m(H)-c+2
t(H')=t(H)+c
O(1)-c
O(1)
\Phi(H')=D(n)+1+2m(H)
O(D(n))-t(H)
O(D(n)
(t(H)+1+2m(H))-(t(H)+2m(H))=1
(t(H')+2m(H'))-(t(H)+2m(H))=
\Phi(H)=t(H)+2m(H)
O(D(n))+O(t(H))