Разбирательство с симметриями...
Попросил внести ясность известного блоггера из Чехии Любоша Мотла,который недавно поместил свою запись на эту тему
http://motls.blogspot.com/2009/06/symmetry-and-beauty.html
Yuri:
"I want to clearly represent the relationships between these symmetries:
discrete &. continuous symmetries
global &. local symmetries
internal &. space-time symmetries"
Lubos:
"Sorry but there are almost no relationships between these 3 pairs of adjectives at all. Almost all 8 combinations exist, with an exception of "local spacetime" symmetries: local symmetries must be internal (but global symmetries may be both spacetime or internal). So 6 combinations exist. And even the local spacetime symmetries could be said to exist, with the diffeomorphisms being an example. So there's no diagram to draw."