Enigma machine | Enigma | Enigma Records | Enigma (musical project) | Enigma (2001 film) | The Enigma of Arrival | Hidden Fuhrer: Debating the Enigma of Hitler's Sexuality | Enigma (rapper) | "Enigma" coding machine | enigma | David Seetapun | Blue Enigma Party |
As a 22 year old undergraduate student Lu solved the mathematical problem, the Seetapun Enigma, which was proposed by English logician David Seetapun in the 1990s and had not yet been solved.