Latex command \lll or \ggg not working

Question

I'm trying to write ">>>" using the command "\ggg" or "\lll". Here is list of the packages I'm using:

\usepackage{cite,graphicx,amssymb,amsmath,psfrag,bm}    
\usepackage[usenames,dvipsnames,table,xcdraw]{xcolor}    
\usepackage{mathabx}    
\usepackage{array}    
\usepackage{hyperref}    
\usepackage{cancel}    
\usepackage{epstopdf}    
\usepackage{rotating}    
\epstopdfsetup{update}    
\usepackage{pstool}    
\usepackage{multirow}    
\usepackage{color}    
\usepackage{soul}    
\usepackage{fullpage}    
\usepackage{bibentry}
\usepackage{caption}    
\usepackage{subcaption}

But this is what I get at the end:

I really appreciate for any help.

Answer 1

You need to add the MnSymbol package using \usepackage{MnSymbol} and remove \usepackage{mathabx}.

The list of symbols could be found here.