The Largest Number Smaller Than Five
Hobbs, Chris / Perryman, Richard
This is a book for teenagers of all ages from 10 to 90. Demanding very little prior knowledge, it presents advanced mathematical ideas, casts doubt on the truth of much mathematics and asks questions to which no one knows the answer. Aimed at those who have caught, or are close to catching, the mathematics bug, it covers some of the most exciting topics engaging mathematicians today.