French president: 1913-1920

• French mathematician Henri whose conjecture was one of the great unsolved problems (until it was cracked in 2003)
• French mathematician Henri whose famous conjecture was finally proven in 2003

Wikipedia Word definitions in Wikipedia
Poincaré is a large lunar impact basin that lies in the southern hemisphere on the far side of the Moon . Most of the formation has been heavily eroded by subsequent impacts, leaving a battered formation with only rugged remnants of the original outer rim ...