E
e 24 –7
Egyptians 8 , 15 , 165
Einstein, Albert 97 , 111 , 113 , 177 , 192 , 194 –5
ellipse 88 , 89 , 115
empty set 7 , 204
encryption 160 –3
equations 56 –8, 62 –3, 90 , 196
error detection, codes 161
Euclid of Alexandria
algorithm 60 –3
constructing polygons 82 , 83
perfect numbers 40 , 43
postulates 108 –11
prime numbers 38
QED 70
triangles 84 , 85
Euler, Leonhard
e 26 , 27
Euler line 85 –6
Euler’s formula 93 –4, 163
Fermat’s last theorem 198
graphs 116 –17
Latin Square 172 –3, 174
perfect numbers 43
pi (π) 21 –2
squared squares 170
exponent 204
F
factorial numbers 165 –6
Fano plane 114
Fermat, Pierre de
Fermat’s last theorem 170 , 196 –9
prime numbers 39 , 83
probability 125
Fibonacci sequence 44 –7, 54
four-colour problem 120 –3
fractals 54 , 99 , 100 –3, 107
fractional dimension 103
fractions 8 , 12 –15, 204