Some trivial facts about the cover (in no particular order)

The cover displays an abacus, each of whose five rows has silver beads displaying banknotes from major nations

• United Kingdom: the ten pound note, with HM Queen Elizabeth II
• France: the fifty franc note, with Antoine de Saint-Exupéry, aviator and author
• Germany: the ten mark note, with mathematician Carl Friedrich Gauss
• Japan: the thousand yen note, with novelist Soseki Natsume
• United States: the twenty dollar bill, with former President Andrew Jackson (Democrat)

The faces from the five notes also appear faintly in the background

The US bill is the most valuable of the five (at current rates), and the 10DM note the least

A normal distribution curve is just visible on the German note to the left of Gauss' head

On the backs of the notes, not visible in the picture, are:

• The novelist Charles Dickens
• A biplane and le Petit Prince
• The bridges of Königsberg problem
• A pair of cranes (birds)
• The White House, Washington DC

The word calculus is Latin for abacus bead

Designers: Phil Treble (for CUP); Paul Oldman

Cover image courtesy of Tony Stone Images

See cover at full-size (118k) or half-size (32k).

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