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 Brazil
seen from China
seen from Ukraine
seen from Russia
seen from Ukraine
seen from Sweden
seen from Thailand
seen from United States
seen from Türkiye
seen from China
seen from Malaysia
seen from Russia
seen from United States
seen from Canada
seen from United Kingdom
seen from China
seen from Ukraine
seen from United States
seen from United States
seen from Russia
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.