Mar 23, 2019
the more fair & crystal is the sky, the uglier seem the clouds that in it fly
Henry Bolingbroke, Duke of Hereford
King Richard Ⅱ by W Shakespeare
seen from Tunisia
seen from Saudi Arabia
seen from United Kingdom
seen from United States
seen from China
seen from Brazil
seen from Kenya
seen from United States
seen from Türkiye
seen from United States
seen from Netherlands
seen from United States
seen from United States
seen from United States
seen from Russia
seen from United States
seen from Italy
seen from Spain
seen from Germany
seen from United States
the more fair & crystal is the sky, the uglier seem the clouds that in it fly
Henry Bolingbroke, Duke of Hereford
King Richard Ⅱ by W Shakespeare
Today I learned that, in combinatorics, a necklace is a torsor for a cyclic group, while a bracelet is a torsor for a dihedral group.