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 Germany
seen from Japan
seen from United States
seen from France
seen from United States
seen from Singapore
seen from China
seen from Sweden
seen from Japan
seen from Israel
seen from Germany
seen from Germany
seen from Croatia
seen from Germany
seen from Yemen
seen from China
seen from Germany
seen from China
seen from China
seen from Germany
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.