Playing with Infinity: Turtles, Patterns, and Pictures [Paperback]

1. What is this book about? 1.1. Infinitely many. 1.2. Infinite sequences and turtle figures. 1.3. Morphic sequences and symmetry. 1.4. Fractal turtle figures. 1.5. Mathematical challenges. 1.6. Who is this book for, how is it organized and how to read it? Challenge: the paint pot problem. 2. Numbers of the simplest kind. 2.1. Natural numbers. 2.2. Induction?Strong induction. 2.3. Addition. 2.4. Multiplication. 2.5. Divisors and prime numbers. Challenge: number of divisors. 3. More complicated numbers. 3.1. Integer numbers. 3.2. Rational numbers. 3.3. Real numbers. 3.4. Complex numbers. Challenge: ten questions.?4. Flavors of infinity. 4.1. The Hilbert Hotel. 4.2. Smaller than? 4.3. Equal size? 4.4. Countable sets. 4.5. Uncountable sets. 4.6. Computable numbers. 4.7. Cardinal numbers. Challenge: monotone functions. 5 Infinite sequences. 5.1. Operations on sequences?Morphisms. 5.2. Periodic and ultimately periodic sequences. 5.3. Decimal notation of numbers. 5.4. Frequency of symbols. 5.5. Challenge: the marble box. ?6. Turtle figures. 6.1.?Turtle figures of words and sequences. 6.2. Turtle figures of periodic sequences?Some theory. 6.3. Finite turtle figures of periodic sequences. 6.4. Infinite turtle figures of periodic sequences. 6.5. Ultimately periodic sequences. Challenge: subword with zero angle.?7. Programming. 7.1. Turtle programming in Python. 7.2. Turtle programming in Lazarus. 7.3. Some theory. Challenge: knight moves. 8. More complicated sequences. 8.1. Random sequences. 8.2. The spiral sequence. 8.3. Pure morphic sequences. 8.4. Morphic sequences. 8.5. Programming morphic sequences. Challenge: a variation on the spiral sequence. 9. The Thue-Morse sequence. 9.1 A fair distribution. 9.2. The Thue-Morse sequence as a morphic sequence 9.3. Alternative characterizations. 9.4. Finitl³V