# For Math Fans

### Visit the Sites

• The Usefulness of Useless Knowledge by Robbert Dijkgraaf, ISBN 9780691174761
• A Mathematician’s Apology by G. H. Hardy,  ISBN 1684221851
• Mathematics without apologies: Portrait of a Problematic Vocation by Michael Harris, ISBN 0691175837
• How to Bake Pi: An Edible Exploration of the Mathematics of Mathematics by Eugenia Cheng, ISBN 0465097677
• Math with Bad Drawings: Illuminating the Ideas That Shape Our Reality by Ben Orlin ISBN 0316509035
• Beyond Infinity: An Expedition to the Outer Limits of Mathematics by Eugenia Cheng, ISBN 0465094813

### Have you ever wondered?

• Which number do you like better, π or e? Why?
• The area of a triangle is a half of its base times height. Can you prove this without a word?
• Think of wooden puzzles involving tessellations, both of the Euclidean and the hyperbolic plane (e.g. puzzles related to M.C. Escher’s paintings, link above).
• Are there different infinities? How many different infinities do we have?
• Why do topologists get donuts and coffee cups confused?
• My brother’s brother is my brother, but my father’s father is not my father, right?