How is catharsis (literary term) used in the book The Great Gatsby?Can you provide a few examples and maybe the page number too. I would be...

Concerning The Great Gatsby, I may be
in the minority, but I don't think catharsis is present in the novel.  It is considered
a modern tragedy, but I don't think a modern tragedy necessarily involves
catharsis.

The end is not neatly tied up in the novel. 
Gatsby's death is an injustice.  Deaths in traditional tragedies may be unjust, too,
such as in Hamlet.  But in Hamlet the evil is
purged.  No such purging occurs in Gatsby.  Tom is alive and well
and as self-satisfied as ever.  Daisy escapes without consequence.  Jordan, egocentric
as she is, has suffered no loss in status, etc.  The world is not better off because
Myrtle, Wilson, and Gatsby are dead (see the last few pages of the
novel). 

If the conclusion is circular or tied up or neat,
in any way, it's just that Nick will continue to dream as Gatsby dreamed, and, who
knows, maybe some day these dreams will come true.  But the state of affairs is as it
was before.  Nothing significant has changed, except that a man who loved as few others
have loved has failed, and been killed in the process.  This is not
catharsis.