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 China
seen from Netherlands
seen from United States
seen from Malaysia
seen from Germany
seen from Somalia
seen from Netherlands
seen from Philippines
seen from Jordan
seen from United States
seen from United States
seen from United States
seen from United States
seen from United States
seen from China
seen from China
seen from Macao SAR China
seen from United Kingdom
seen from United States
seen from China
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.