دانلود کتاب Riddles of the Sphinx and Other Mathematical Puzzle Tales

"Solving these riddles is not simply a matter of logic and calculation, though these play a role. Luck and inspiration are factors as well, so beginners and experts alike may profitably exercise their wits on Gardner's problems, whose subjects range from geometry to word play to questions relating to physics and geology. We guarantee that you will solve some of these riddles, be stumped by others, and be amused by almost all of the stories and settings that Gardner has devised to raise these questions." --Back cover. Read more... Riddles of the Sphinx -- Precognition and the Mystic Seven -- On to Charmain -- Technology on VZIGS -- The Valley of Lost Things -- Around the Solar System -- The Stripe on Barberpolia -- The Road to Mandalay -- The Black Hole of Cal Cutter -- Science Fantasy Quiz -- The Barbers of Barberpolia -- It's All Done with Mirrors -- Satan and the Apple -- How's-that-again Flanagan -- Relativistically Speaking -- Bar Bets on the Bagel -- Catch the BEM -- Animal TTT -- Playing Safe on the Bagel -- Sex Among the Polyomans -- Inner Planets Quiz -- Puzzles in Flatland -- Dirac's Scissors -- Bull's-eyes and Pratfalls -- Flarp Flips and Another Fiver -- Blues in the Night -- Again, How's That Again? -- Alice in Beeland -- Hustle Off to Buffalo -- Ray Palmer's Arcade -- Puzzle Flags on Mars -- The Vanishing Plank -- 987654321 -- Time-reversed Worlds -- The Wisdom of Solomon -- Thang, the Planet Eater