\def\bigtheta#1{\ensuremath{\Theta(#1)}}
\def\bigomega#1{\ensuremath{\Omega(#1)}}
\def\bigo#1{\ensuremath{O(#1)}}
\def\inbigtheta#1#2{\ensuremath{{#1}\in\bigtheta{#2}}}
\def\inbigo#1#2{\ensuremath{{#1}\in\bigo{#2}}}
\def\inbigomega#1#2{\ensuremath{{#1}\in\bigomega{#2}}}
