Justified True Belief Knowledge

1) Explain Edmund Gettier’s argument from his article, Is Justified True Belief Knowledge? Present an argument either in defense or against Edmund Gettier’s objections to the justified-true-belief notion of knowledge.  2) Explain Peter Unger’s argument from his piece, An Argument for Skepticism. Do you think Peter Unger is correct to claim that certainty is required for knowledge? If so, then offer an argument in defense of his position. If not, then offer an argument in objection to his position.  3) Does Descartes’s argument about his own existence give us reason to reject Unger’s claim that certainty requires one to be dogmatic, and thus it is unreasonable to claim certainty? If so, then offer an argument in defense of this position. If not, then offer an argument in objection to this position