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Название: Projectively dual varieties
Автор: Tevelev E.
During several centuries various reincarnations of projective duality have inspired research in algebraic and differential geometry, classical mechanics, invariant theory, combinatorics, etc. On the other hand, projective duality is simply the systematic way of recovering the projective variety from the set
of its tangent hyperplanes. In this survey we have tried to collect together
different aspects of projective duality and points of view on it. We hope, that
the exposition is quite informal and requires only a standard knowledge of
algebraic geometry and algebraic (or Lie) groups theory. Some chapters are,
however, more difficult and use the modern intersection theory and homology
algebra. But even in these cases we have tried to give simple examples and
avoid technical difficulties.