Is the thesis statement the same thing as the main point?

Answer 1

A good thesis statement tells what the writer intends to prove by the end of the paper, so ... yes ... you could say it's the main point.

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Answer 2

A thesis statement tells what you want to prove in your essay. Check these sites for details.

http://www.indiana.edu/~wts/pamphlets/thesis_statement.shtml

http://www.unc.edu/depts/wcweb/handouts/thesis.html

http://owl.english.purdue.edu/owl/resource/545/01/