[1] Richard Friedberg. An Adventurer’s Guide to Number Theory. McGraw-Hill Book Company, United States of America, 1968.

[2] Martin Gardner. Aha! A Two Volume Collection. The Mathematical Asso- ciation of America, United States of America, 2006.

[3] Michael Spivak. Calculus. Publish or Perish, Inc., United States of America, third edition, 1994.

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