Caspar Last, an unambitious, reclusive middle-aged mathematical genius, has created a time machine more as a solution for a mathematical riddle than in order to make use of it.

Launched yesterday, the brand-new instalment features more than 165 puzzles, including mazes, jigsaws, pictures, mathematical riddles and logic puzzles.

But normally he was pretty sharp on mathematical riddles, and he knew a great number of them.

Hodgins is shown bringing him a mathematical riddle to solve.

Zero Cipher take their name from a mathematical riddle based on cryptography.

The audience has to stay in step with the punch lines as well as with the mathematical riddles.

In his inaugural address, he declared his intention to make Dartmouth more attractive to students who took pleasure in "the lonely acts of writing poetry or mastering the cello or solving mathematical riddles or translating Catullus."

They'd needed to solve a mathematical riddle in the Cradle of Lud in order to gain access to Blaine, and Susannah had suggested the Mystery Number was a holdover from that.

The iconography is full of zodiac symbols, mathematical riddles, geometric mazes right out of alchemical texts of the time.

Now she remembered the way he had abruptly posed a mathematical riddle to her.