Some observations: Isn't the first title just the first volume of the Calculus textbook used in 'Saw'? Does the second title have errata? Does the third book

Some observations: Isn't the first title just the first volume of the Calculus textbook used in 'Saw'? Does the second title have errata? Does the third book describe the current political climate in the States? Is the fourth book written by the Mafia?